diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 71b9407..d0cd4d5 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,18 +1,22 @@
 # See https://pre-commit.com/ for usage and config
+fail_fast: true
 repos:
   # https://github.com/pre-commit/pre-commit-hooks/releases/tag/v4.3.0
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.4.0
     hooks:
+      - id: check-ast
       - id: trailing-whitespace
       - id: end-of-file-fixer
       - id: mixed-line-ending
         args: [ --fix, auto ]
+      - id: check-json
       - id: check-yaml
+      - id: check-toml
       - id: debug-statements
       - id: name-tests-test
         args: [ --pytest-test-first ]
-      - id: detect-private-key
+      - id: check-case-conflict
   - repo: local
     hooks:
       - id: isort
diff --git a/Pipfile b/Pipfile
index 585cc97..27368c7 100644
--- a/Pipfile
+++ b/Pipfile
@@ -40,6 +40,8 @@ python-stdnum = "==1.18"
 tenacity = "==8.2.2"
 # Python plotting package. https://pypi.org/project/matplotlib/
 matplotlib = "==3.7.1"
+# Pretty Good Privacy for Python. https://github.com/SecurityInnovation/PGPy
+pgpy = "==0.6.0"
 
 [dev-packages]
 # Black is the uncompromising Python code formatter. By using it, you agree to cede control over minutiae of
diff --git a/Pipfile.lock b/Pipfile.lock
index b75178b..7e5b7fb 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "07f047c5dd5f7c9ba9d36e2c1c489da488c2c2bef0e5a2cad7909c93f08efe83"
+            "sha256": "7122e2779651121548ba8ba1b23499a556cc160d32f87df218eaaa16f3c11370"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -24,6 +24,75 @@
             "index": "pypi",
             "version": "==1.2.3"
         },
+        "cffi": {
+            "hashes": [
+                "sha256:00a9ed42e88df81ffae7a8ab6d9356b371399b91dbdf0c3cb1e84c03a13aceb5",
+                "sha256:03425bdae262c76aad70202debd780501fabeaca237cdfddc008987c0e0f59ef",
+                "sha256:04ed324bda3cda42b9b695d51bb7d54b680b9719cfab04227cdd1e04e5de3104",
+                "sha256:0e2642fe3142e4cc4af0799748233ad6da94c62a8bec3a6648bf8ee68b1c7426",
+                "sha256:173379135477dc8cac4bc58f45db08ab45d228b3363adb7af79436135d028405",
+                "sha256:198caafb44239b60e252492445da556afafc7d1e3ab7a1fb3f0584ef6d742375",
+                "sha256:1e74c6b51a9ed6589199c787bf5f9875612ca4a8a0785fb2d4a84429badaf22a",
+                "sha256:2012c72d854c2d03e45d06ae57f40d78e5770d252f195b93f581acf3ba44496e",
+                "sha256:21157295583fe8943475029ed5abdcf71eb3911894724e360acff1d61c1d54bc",
+                "sha256:2470043b93ff09bf8fb1d46d1cb756ce6132c54826661a32d4e4d132e1977adf",
+                "sha256:285d29981935eb726a4399badae8f0ffdff4f5050eaa6d0cfc3f64b857b77185",
+                "sha256:30d78fbc8ebf9c92c9b7823ee18eb92f2e6ef79b45ac84db507f52fbe3ec4497",
+                "sha256:320dab6e7cb2eacdf0e658569d2575c4dad258c0fcc794f46215e1e39f90f2c3",
+                "sha256:33ab79603146aace82c2427da5ca6e58f2b3f2fb5da893ceac0c42218a40be35",
+                "sha256:3548db281cd7d2561c9ad9984681c95f7b0e38881201e157833a2342c30d5e8c",
+                "sha256:3799aecf2e17cf585d977b780ce79ff0dc9b78d799fc694221ce814c2c19db83",
+                "sha256:39d39875251ca8f612b6f33e6b1195af86d1b3e60086068be9cc053aa4376e21",
+                "sha256:3b926aa83d1edb5aa5b427b4053dc420ec295a08e40911296b9eb1b6170f6cca",
+                "sha256:3bcde07039e586f91b45c88f8583ea7cf7a0770df3a1649627bf598332cb6984",
+                "sha256:3d08afd128ddaa624a48cf2b859afef385b720bb4b43df214f85616922e6a5ac",
+                "sha256:3eb6971dcff08619f8d91607cfc726518b6fa2a9eba42856be181c6d0d9515fd",
+                "sha256:40f4774f5a9d4f5e344f31a32b5096977b5d48560c5592e2f3d2c4374bd543ee",
+                "sha256:4289fc34b2f5316fbb762d75362931e351941fa95fa18789191b33fc4cf9504a",
+                "sha256:470c103ae716238bbe698d67ad020e1db9d9dba34fa5a899b5e21577e6d52ed2",
+                "sha256:4f2c9f67e9821cad2e5f480bc8d83b8742896f1242dba247911072d4fa94c192",
+                "sha256:50a74364d85fd319352182ef59c5c790484a336f6db772c1a9231f1c3ed0cbd7",
+                "sha256:54a2db7b78338edd780e7ef7f9f6c442500fb0d41a5a4ea24fff1c929d5af585",
+                "sha256:5635bd9cb9731e6d4a1132a498dd34f764034a8ce60cef4f5319c0541159392f",
+                "sha256:59c0b02d0a6c384d453fece7566d1c7e6b7bae4fc5874ef2ef46d56776d61c9e",
+                "sha256:5d598b938678ebf3c67377cdd45e09d431369c3b1a5b331058c338e201f12b27",
+                "sha256:5df2768244d19ab7f60546d0c7c63ce1581f7af8b5de3eb3004b9b6fc8a9f84b",
+                "sha256:5ef34d190326c3b1f822a5b7a45f6c4535e2f47ed06fec77d3d799c450b2651e",
+                "sha256:6975a3fac6bc83c4a65c9f9fcab9e47019a11d3d2cf7f3c0d03431bf145a941e",
+                "sha256:6c9a799e985904922a4d207a94eae35c78ebae90e128f0c4e521ce339396be9d",
+                "sha256:70df4e3b545a17496c9b3f41f5115e69a4f2e77e94e1d2a8e1070bc0c38c8a3c",
+                "sha256:7473e861101c9e72452f9bf8acb984947aa1661a7704553a9f6e4baa5ba64415",
+                "sha256:8102eaf27e1e448db915d08afa8b41d6c7ca7a04b7d73af6514df10a3e74bd82",
+                "sha256:87c450779d0914f2861b8526e035c5e6da0a3199d8f1add1a665e1cbc6fc6d02",
+                "sha256:8b7ee99e510d7b66cdb6c593f21c043c248537a32e0bedf02e01e9553a172314",
+                "sha256:91fc98adde3d7881af9b59ed0294046f3806221863722ba7d8d120c575314325",
+                "sha256:94411f22c3985acaec6f83c6df553f2dbe17b698cc7f8ae751ff2237d96b9e3c",
+                "sha256:98d85c6a2bef81588d9227dde12db8a7f47f639f4a17c9ae08e773aa9c697bf3",
+                "sha256:9ad5db27f9cabae298d151c85cf2bad1d359a1b9c686a275df03385758e2f914",
+                "sha256:a0b71b1b8fbf2b96e41c4d990244165e2c9be83d54962a9a1d118fd8657d2045",
+                "sha256:a0f100c8912c114ff53e1202d0078b425bee3649ae34d7b070e9697f93c5d52d",
+                "sha256:a591fe9e525846e4d154205572a029f653ada1a78b93697f3b5a8f1f2bc055b9",
+                "sha256:a5c84c68147988265e60416b57fc83425a78058853509c1b0629c180094904a5",
+                "sha256:a66d3508133af6e8548451b25058d5812812ec3798c886bf38ed24a98216fab2",
+                "sha256:a8c4917bd7ad33e8eb21e9a5bbba979b49d9a97acb3a803092cbc1133e20343c",
+                "sha256:b3bbeb01c2b273cca1e1e0c5df57f12dce9a4dd331b4fa1635b8bec26350bde3",
+                "sha256:cba9d6b9a7d64d4bd46167096fc9d2f835e25d7e4c121fb2ddfc6528fb0413b2",
+                "sha256:cc4d65aeeaa04136a12677d3dd0b1c0c94dc43abac5860ab33cceb42b801c1e8",
+                "sha256:ce4bcc037df4fc5e3d184794f27bdaab018943698f4ca31630bc7f84a7b69c6d",
+                "sha256:cec7d9412a9102bdc577382c3929b337320c4c4c4849f2c5cdd14d7368c5562d",
+                "sha256:d400bfb9a37b1351253cb402671cea7e89bdecc294e8016a707f6d1d8ac934f9",
+                "sha256:d61f4695e6c866a23a21acab0509af1cdfd2c013cf256bbf5b6b5e2695827162",
+                "sha256:db0fbb9c62743ce59a9ff687eb5f4afbe77e5e8403d6697f7446e5f609976f76",
+                "sha256:dd86c085fae2efd48ac91dd7ccffcfc0571387fe1193d33b6394db7ef31fe2a4",
+                "sha256:e00b098126fd45523dd056d2efba6c5a63b71ffe9f2bbe1a4fe1716e1d0c331e",
+                "sha256:e229a521186c75c8ad9490854fd8bbdd9a0c9aa3a524326b55be83b54d4e0ad9",
+                "sha256:e263d77ee3dd201c3a142934a086a4450861778baaeeb45db4591ef65550b0a6",
+                "sha256:ed9cb427ba5504c1dc15ede7d516b84757c3e3d7868ccc85121d9310d27eed0b",
+                "sha256:fa6693661a4c91757f4412306191b6dc88c1703f780c8234035eac011922bc01",
+                "sha256:fcd131dd944808b5bdb38e6f5b53013c5aa4f334c5cad0c72742f6eba4b73db0"
+            ],
+            "version": "==1.15.1"
+        },
         "colorama": {
             "hashes": [
                 "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44",
@@ -93,6 +162,31 @@
             "markers": "python_version >= '3.8'",
             "version": "==1.0.7"
         },
+        "cryptography": {
+            "hashes": [
+                "sha256:0a4e3406cfed6b1f6d6e87ed243363652b2586b2d917b0609ca4f97072994405",
+                "sha256:1e0af458515d5e4028aad75f3bb3fe7a31e46ad920648cd59b64d3da842e4356",
+                "sha256:2803f2f8b1e95f614419926c7e6f55d828afc614ca5ed61543877ae668cc3472",
+                "sha256:28d63d75bf7ae4045b10de5413fb1d6338616e79015999ad9cf6fc538f772d41",
+                "sha256:32057d3d0ab7d4453778367ca43e99ddb711770477c4f072a51b3ca69602780a",
+                "sha256:3a4805a4ca729d65570a1b7cac84eac1e431085d40387b7d3bbaa47e39890b88",
+                "sha256:63dac2d25c47f12a7b8aa60e528bfb3c51c5a6c5a9f7c86987909c6c79765554",
+                "sha256:650883cc064297ef3676b1db1b7b1df6081794c4ada96fa457253c4cc40f97db",
+                "sha256:6f2bbd72f717ce33100e6467572abaedc61f1acb87b8d546001328d7f466b778",
+                "sha256:7c872413353c70e0263a9368c4993710070e70ab3e5318d85510cc91cce77e7c",
+                "sha256:918cb89086c7d98b1b86b9fdb70c712e5a9325ba6f7d7cfb509e784e0cfc6917",
+                "sha256:9618a87212cb5200500e304e43691111570e1f10ec3f35569fdfcd17e28fd797",
+                "sha256:a805a7bce4a77d51696410005b3e85ae2839bad9aa38894afc0aa99d8e0c3160",
+                "sha256:cc3a621076d824d75ab1e1e530e66e7e8564e357dd723f2533225d40fe35c60c",
+                "sha256:cd033d74067d8928ef00a6b1327c8ea0452523967ca4463666eeba65ca350d4c",
+                "sha256:cf91e428c51ef692b82ce786583e214f58392399cf65c341bc7301d096fa3ba2",
+                "sha256:d36bbeb99704aabefdca5aee4eba04455d7a27ceabd16f3b3ba9bdcc31da86c4",
+                "sha256:d8aa3609d337ad85e4eb9bb0f8bcf6e4409bfb86e706efa9a027912169e89122",
+                "sha256:f5d7b79fa56bc29580faafc2ff736ce05ba31feaa9d4735048b0de7d9ceb2b94"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==40.0.1"
+        },
         "cycler": {
             "hashes": [
                 "sha256:3a27e95f763a428a739d2add979fa7494c912a32c17c4c38c4d5f082cad165a3",
@@ -111,11 +205,11 @@
         },
         "fonttools": {
             "hashes": [
-                "sha256:85245aa2fd4cf502a643c9a9a2b5a393703e150a6eaacc3e0e84bb448053f061",
-                "sha256:e2d9f10337c9e3b17f9bce17a60a16a885a7d23b59b7f45ce07ea643e5580439"
+                "sha256:64c0c05c337f826183637570ac5ab49ee220eec66cf50248e8df527edfa95aeb",
+                "sha256:9234b9f57b74e31b192c3fc32ef1a40750a8fbc1cd9837a7b7bfc4ca4a5c51d7"
             ],
             "markers": "python_version >= '3.8'",
-            "version": "==4.39.2"
+            "version": "==4.39.3"
         },
         "jinja2": {
             "hashes": [
@@ -392,88 +486,109 @@
             "index": "pypi",
             "version": "==3.16.0"
         },
+        "pgpy": {
+            "hashes": [
+                "sha256:279c2e353f4c3a319f00bd9bd582456e420f8a3ac6de2b4e9731444746828383"
+            ],
+            "index": "pypi",
+            "version": "==0.6.0"
+        },
         "pillow": {
             "hashes": [
-                "sha256:013016af6b3a12a2f40b704677f8b51f72cb007dac785a9933d5c86a72a7fe33",
-                "sha256:0845adc64fe9886db00f5ab68c4a8cd933ab749a87747555cec1c95acea64b0b",
-                "sha256:0884ba7b515163a1a05440a138adeb722b8a6ae2c2b33aea93ea3118dd3a899e",
-                "sha256:09b89ddc95c248ee788328528e6a2996e09eaccddeeb82a5356e92645733be35",
-                "sha256:0dd4c681b82214b36273c18ca7ee87065a50e013112eea7d78c7a1b89a739153",
-                "sha256:0e51f608da093e5d9038c592b5b575cadc12fd748af1479b5e858045fff955a9",
-                "sha256:0f3269304c1a7ce82f1759c12ce731ef9b6e95b6df829dccd9fe42912cc48569",
-                "sha256:16a8df99701f9095bea8a6c4b3197da105df6f74e6176c5b410bc2df2fd29a57",
-                "sha256:19005a8e58b7c1796bc0167862b1f54a64d3b44ee5d48152b06bb861458bc0f8",
-                "sha256:1b4b4e9dda4f4e4c4e6896f93e84a8f0bcca3b059de9ddf67dac3c334b1195e1",
-                "sha256:28676836c7796805914b76b1837a40f76827ee0d5398f72f7dcc634bae7c6264",
-                "sha256:2968c58feca624bb6c8502f9564dd187d0e1389964898f5e9e1fbc8533169157",
-                "sha256:3f4cc516e0b264c8d4ccd6b6cbc69a07c6d582d8337df79be1e15a5056b258c9",
-                "sha256:3fa1284762aacca6dc97474ee9c16f83990b8eeb6697f2ba17140d54b453e133",
-                "sha256:43521ce2c4b865d385e78579a082b6ad1166ebed2b1a2293c3be1d68dd7ca3b9",
-                "sha256:451f10ef963918e65b8869e17d67db5e2f4ab40e716ee6ce7129b0cde2876eab",
-                "sha256:46c259e87199041583658457372a183636ae8cd56dbf3f0755e0f376a7f9d0e6",
-                "sha256:46f39cab8bbf4a384ba7cb0bc8bae7b7062b6a11cfac1ca4bc144dea90d4a9f5",
-                "sha256:519e14e2c49fcf7616d6d2cfc5c70adae95682ae20f0395e9280db85e8d6c4df",
-                "sha256:53dcb50fbdc3fb2c55431a9b30caeb2f7027fcd2aeb501459464f0214200a503",
-                "sha256:54614444887e0d3043557d9dbc697dbb16cfb5a35d672b7a0fcc1ed0cf1c600b",
-                "sha256:575d8912dca808edd9acd6f7795199332696d3469665ef26163cd090fa1f8bfa",
-                "sha256:5dd5a9c3091a0f414a963d427f920368e2b6a4c2f7527fdd82cde8ef0bc7a327",
-                "sha256:5f532a2ad4d174eb73494e7397988e22bf427f91acc8e6ebf5bb10597b49c493",
-                "sha256:60e7da3a3ad1812c128750fc1bc14a7ceeb8d29f77e0a2356a8fb2aa8925287d",
-                "sha256:653d7fb2df65efefbcbf81ef5fe5e5be931f1ee4332c2893ca638c9b11a409c4",
-                "sha256:6663977496d616b618b6cfa43ec86e479ee62b942e1da76a2c3daa1c75933ef4",
-                "sha256:6abfb51a82e919e3933eb137e17c4ae9c0475a25508ea88993bb59faf82f3b35",
-                "sha256:6c6b1389ed66cdd174d040105123a5a1bc91d0aa7059c7261d20e583b6d8cbd2",
-                "sha256:6d9dfb9959a3b0039ee06c1a1a90dc23bac3b430842dcb97908ddde05870601c",
-                "sha256:765cb54c0b8724a7c12c55146ae4647e0274a839fb6de7bcba841e04298e1011",
-                "sha256:7a21222644ab69ddd9967cfe6f2bb420b460dae4289c9d40ff9a4896e7c35c9a",
-                "sha256:7ac7594397698f77bce84382929747130765f66406dc2cd8b4ab4da68ade4c6e",
-                "sha256:7cfc287da09f9d2a7ec146ee4d72d6ea1342e770d975e49a8621bf54eaa8f30f",
-                "sha256:83125753a60cfc8c412de5896d10a0a405e0bd88d0470ad82e0869ddf0cb3848",
-                "sha256:847b114580c5cc9ebaf216dd8c8dbc6b00a3b7ab0131e173d7120e6deade1f57",
-                "sha256:87708d78a14d56a990fbf4f9cb350b7d89ee8988705e58e39bdf4d82c149210f",
-                "sha256:8a2b5874d17e72dfb80d917213abd55d7e1ed2479f38f001f264f7ce7bae757c",
-                "sha256:8f127e7b028900421cad64f51f75c051b628db17fb00e099eb148761eed598c9",
-                "sha256:94cdff45173b1919350601f82d61365e792895e3c3a3443cf99819e6fbf717a5",
-                "sha256:99d92d148dd03fd19d16175b6d355cc1b01faf80dae93c6c3eb4163709edc0a9",
-                "sha256:9a3049a10261d7f2b6514d35bbb7a4dfc3ece4c4de14ef5876c4b7a23a0e566d",
-                "sha256:9d9a62576b68cd90f7075876f4e8444487db5eeea0e4df3ba298ee38a8d067b0",
-                "sha256:9e5f94742033898bfe84c93c831a6f552bb629448d4072dd312306bab3bd96f1",
-                "sha256:a1c2d7780448eb93fbcc3789bf3916aa5720d942e37945f4056680317f1cd23e",
-                "sha256:a2e0f87144fcbbe54297cae708c5e7f9da21a4646523456b00cc956bd4c65815",
-                "sha256:a4dfdae195335abb4e89cc9762b2edc524f3c6e80d647a9a81bf81e17e3fb6f0",
-                "sha256:a96e6e23f2b79433390273eaf8cc94fec9c6370842e577ab10dabdcc7ea0a66b",
-                "sha256:aabdab8ec1e7ca7f1434d042bf8b1e92056245fb179790dc97ed040361f16bfd",
-                "sha256:b222090c455d6d1a64e6b7bb5f4035c4dff479e22455c9eaa1bdd4c75b52c80c",
-                "sha256:b52ff4f4e002f828ea6483faf4c4e8deea8d743cf801b74910243c58acc6eda3",
-                "sha256:b70756ec9417c34e097f987b4d8c510975216ad26ba6e57ccb53bc758f490dab",
-                "sha256:b8c2f6eb0df979ee99433d8b3f6d193d9590f735cf12274c108bd954e30ca858",
-                "sha256:b9b752ab91e78234941e44abdecc07f1f0d8f51fb62941d32995b8161f68cfe5",
-                "sha256:ba6612b6548220ff5e9df85261bddc811a057b0b465a1226b39bfb8550616aee",
-                "sha256:bd752c5ff1b4a870b7661234694f24b1d2b9076b8bf337321a814c612665f343",
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-                "sha256:fb5c1ad6bad98c57482236a21bf985ab0ef42bd51f7ad4e4538e89a997624e12"
+                "sha256:07999f5834bdc404c442146942a2ecadd1cb6292f5229f4ed3b31e0a108746b1",
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+                "sha256:229e2c79c00e85989a34b5981a2b67aa079fd08c903f0aaead522a1d68d79e51",
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+                "sha256:252a03f1bdddce077eff2354c3861bf437c892fb1832f75ce813ee94347aa9b5",
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+                "sha256:5671583eab84af046a397d6d0ba25343c00cd50bce03787948e0fff01d4fd9b1",
+                "sha256:5ba1b81ee69573fe7124881762bb4cd2e4b6ed9dd28c9c60a632902fe8db8b38",
+                "sha256:5d4ebf8e1db4441a55c509c4baa7a0587a0210f7cd25fcfe74dbbce7a4bd1906",
+                "sha256:60037a8db8750e474af7ffc9faa9b5859e6c6d0a50e55c45576bf28be7419705",
+                "sha256:608488bdcbdb4ba7837461442b90ea6f3079397ddc968c31265c1e056964f1ef",
+                "sha256:6608ff3bf781eee0cd14d0901a2b9cc3d3834516532e3bd673a0a204dc8615fc",
+                "sha256:662da1f3f89a302cc22faa9f14a262c2e3951f9dbc9617609a47521c69dd9f8f",
+                "sha256:7002d0797a3e4193c7cdee3198d7c14f92c0836d6b4a3f3046a64bd1ce8df2bf",
+                "sha256:763782b2e03e45e2c77d7779875f4432e25121ef002a41829d8868700d119392",
+                "sha256:77165c4a5e7d5a284f10a6efaa39a0ae8ba839da344f20b111d62cc932fa4e5d",
+                "sha256:7c9af5a3b406a50e313467e3565fc99929717f780164fe6fbb7704edba0cebbe",
+                "sha256:7ec6f6ce99dab90b52da21cf0dc519e21095e332ff3b399a357c187b1a5eee32",
+                "sha256:833b86a98e0ede388fa29363159c9b1a294b0905b5128baf01db683672f230f5",
+                "sha256:84a6f19ce086c1bf894644b43cd129702f781ba5751ca8572f08aa40ef0ab7b7",
+                "sha256:8507eda3cd0608a1f94f58c64817e83ec12fa93a9436938b191b80d9e4c0fc44",
+                "sha256:85ec677246533e27770b0de5cf0f9d6e4ec0c212a1f89dfc941b64b21226009d",
+                "sha256:8aca1152d93dcc27dc55395604dcfc55bed5f25ef4c98716a928bacba90d33a3",
+                "sha256:8d935f924bbab8f0a9a28404422da8af4904e36d5c33fc6f677e4c4485515625",
+                "sha256:8f36397bf3f7d7c6a3abdea815ecf6fd14e7fcd4418ab24bae01008d8d8ca15e",
+                "sha256:91ec6fe47b5eb5a9968c79ad9ed78c342b1f97a091677ba0e012701add857829",
+                "sha256:965e4a05ef364e7b973dd17fc765f42233415974d773e82144c9bbaaaea5d089",
+                "sha256:96e88745a55b88a7c64fa49bceff363a1a27d9a64e04019c2281049444a571e3",
+                "sha256:99eb6cafb6ba90e436684e08dad8be1637efb71c4f2180ee6b8f940739406e78",
+                "sha256:9adf58f5d64e474bed00d69bcd86ec4bcaa4123bfa70a65ce72e424bfb88ed96",
+                "sha256:9b1af95c3a967bf1da94f253e56b6286b50af23392a886720f563c547e48e964",
+                "sha256:a0aa9417994d91301056f3d0038af1199eb7adc86e646a36b9e050b06f526597",
+                "sha256:a0f9bb6c80e6efcde93ffc51256d5cfb2155ff8f78292f074f60f9e70b942d99",
+                "sha256:a127ae76092974abfbfa38ca2d12cbeddcdeac0fb71f9627cc1135bedaf9d51a",
+                "sha256:aaf305d6d40bd9632198c766fb64f0c1a83ca5b667f16c1e79e1661ab5060140",
+                "sha256:aca1c196f407ec7cf04dcbb15d19a43c507a81f7ffc45b690899d6a76ac9fda7",
+                "sha256:ace6ca218308447b9077c14ea4ef381ba0b67ee78d64046b3f19cf4e1139ad16",
+                "sha256:b416f03d37d27290cb93597335a2f85ed446731200705b22bb927405320de903",
+                "sha256:bf548479d336726d7a0eceb6e767e179fbde37833ae42794602631a070d630f1",
+                "sha256:c1170d6b195555644f0616fd6ed929dfcf6333b8675fcca044ae5ab110ded296",
+                "sha256:c380b27d041209b849ed246b111b7c166ba36d7933ec6e41175fd15ab9eb1572",
+                "sha256:c446d2245ba29820d405315083d55299a796695d747efceb5717a8b450324115",
+                "sha256:c830a02caeb789633863b466b9de10c015bded434deb3ec87c768e53752ad22a",
+                "sha256:cb841572862f629b99725ebaec3287fc6d275be9b14443ea746c1dd325053cbd",
+                "sha256:cfa4561277f677ecf651e2b22dc43e8f5368b74a25a8f7d1d4a3a243e573f2d4",
+                "sha256:cfcc2c53c06f2ccb8976fb5c71d448bdd0a07d26d8e07e321c103416444c7ad1",
+                "sha256:d3c6b54e304c60c4181da1c9dadf83e4a54fd266a99c70ba646a9baa626819eb",
+                "sha256:d3d403753c9d5adc04d4694d35cf0391f0f3d57c8e0030aac09d7678fa8030aa",
+                "sha256:d9c206c29b46cfd343ea7cdfe1232443072bbb270d6a46f59c259460db76779a",
+                "sha256:e49eb4e95ff6fd7c0c402508894b1ef0e01b99a44320ba7d8ecbabefddcc5569",
+                "sha256:f8286396b351785801a976b1e85ea88e937712ee2c3ac653710a4a57a8da5d9c",
+                "sha256:f8fc330c3370a81bbf3f88557097d1ea26cd8b019d6433aa59f71195f5ddebbf",
+                "sha256:fbd359831c1657d69bb81f0db962905ee05e5e9451913b18b831febfe0519082",
+                "sha256:fe7e1c262d3392afcf5071df9afa574544f28eac825284596ac6db56e6d11062",
+                "sha256:fed1e1cf6a42577953abbe8e6cf2fe2f566daebde7c34724ec8803c4c0cda579"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==9.4.0"
+            "version": "==9.5.0"
+        },
+        "pyasn1": {
+            "hashes": [
+                "sha256:014c0e9976956a08139dc0712ae195324a75e142284d5f87f1a87ee1b068a359",
+                "sha256:03840c999ba71680a131cfaee6fab142e1ed9bbd9c693e285cc6aca0d555e576",
+                "sha256:0458773cfe65b153891ac249bcf1b5f8f320b7c2ce462151f8fa74de8934becf",
+                "sha256:08c3c53b75eaa48d71cf8c710312316392ed40899cb34710d092e96745a358b7",
+                "sha256:39c7e2ec30515947ff4e87fb6f456dfc6e84857d34be479c9d4a4ba4bf46aa5d",
+                "sha256:5c9414dcfede6e441f7e8f81b43b34e834731003427e5b09e4e00e3172a10f00",
+                "sha256:6e7545f1a61025a4e58bb336952c5061697da694db1cae97b116e9c46abcf7c8",
+                "sha256:78fa6da68ed2727915c4767bb386ab32cdba863caa7dbe473eaae45f9959da86",
+                "sha256:7ab8a544af125fb704feadb008c99a88805126fb525280b2270bb25cc1d78a12",
+                "sha256:99fcc3c8d804d1bc6d9a099921e39d827026409a58f2a720dcdb89374ea0c776",
+                "sha256:aef77c9fb94a3ac588e87841208bdec464471d9871bd5050a287cc9a475cd0ba",
+                "sha256:e89bf84b5437b532b0803ba5c9a5e054d21fec423a89952a74f87fa2c9b7bce2",
+                "sha256:fec3e9d8e36808a28efb59b489e4528c10ad0f480e57dcc32b4de5c9d8c9fdf3"
+            ],
+            "version": "==0.4.8"
+        },
+        "pycparser": {
+            "hashes": [
+                "sha256:8ee45429555515e1f6b185e78100aea234072576aa43ab53aefcae078162fca9",
+                "sha256:e644fdec12f7872f86c58ff790da456218b10f863970249516d60a5eaca77206"
+            ],
+            "version": "==2.21"
         },
         "pyhocon": {
             "hashes": [
@@ -508,10 +623,10 @@
         },
         "pytz": {
             "hashes": [
-                "sha256:01a0681c4b9684a28304615eba55d1ab31ae00bf68ec157ec3708a8182dbbcd0",
-                "sha256:78f4f37d8198e0627c5f1143240bb0206b8691d8d7ac6d78fee88b78733f8c4a"
+                "sha256:1d8ce29db189191fb55338ee6d0387d82ab59f3d00eac103412d64e0ebd0c588",
+                "sha256:a151b3abb88eda1d4e34a9814df37de2a80e301e68ba0fd856fb9b46bfbbbffb"
             ],
-            "version": "==2022.7.1"
+            "version": "==2023.3"
         },
         "six": {
             "hashes": [
@@ -775,11 +890,11 @@
         },
         "filelock": {
             "hashes": [
-                "sha256:75997740323c5f12e18f10b494bc11c03e42843129f980f17c04352cc7b09d40",
-                "sha256:eb8f0f2d37ed68223ea63e3bddf2fac99667e4362c88b3f762e434d160190d18"
+                "sha256:892be14aa8efc01673b5ed6589dbccb95f9a8596f0507e232626155495c18105",
+                "sha256:bde48477b15fde2c7e5a0713cbe72721cb5a5ad32ee0b8f419907960b9d75536"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==3.10.2"
+            "version": "==3.10.7"
         },
         "flake8": {
             "hashes": [
@@ -821,11 +936,11 @@
         },
         "identify": {
             "hashes": [
-                "sha256:69edcaffa8e91ae0f77d397af60f148b6b45a8044b2cc6d99cafa5b04793ff00",
-                "sha256:7671a05ef9cfaf8ff63b15d45a91a1147a03aaccb2976d4e9bd047cbbc508471"
+                "sha256:f0faad595a4687053669c112004178149f6c326db71ee999ae4636685753ad2f",
+                "sha256:f7a93d6cf98e29bd07663c60728e7a4057615068d7a639d132dc883b2d54d31e"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==2.5.21"
+            "version": "==2.5.22"
         },
         "idna": {
             "hashes": [
@@ -949,11 +1064,11 @@
         },
         "platformdirs": {
             "hashes": [
-                "sha256:024996549ee88ec1a9aa99ff7f8fc819bb59e2c3477b410d90a16d32d6e707aa",
-                "sha256:e5986afb596e4bb5bde29a79ac9061aa955b94fca2399b7aaac4090860920dd8"
+                "sha256:d5b638ca397f25f979350ff789db335903d7ea010ab28903f57b27e1b16c2b08",
+                "sha256:ebe11c0d7a805086e99506aa331612429a72ca7cd52a1f0d277dc4adc20cb10e"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==3.1.1"
+            "version": "==3.2.0"
         },
         "pluggy": {
             "hashes": [
@@ -1217,11 +1332,11 @@
         },
         "setuptools": {
             "hashes": [
-                "sha256:2ee892cd5f29f3373097f5a814697e397cf3ce313616df0af11231e2ad118077",
-                "sha256:b78aaa36f6b90a074c1fa651168723acbf45d14cb1196b6f02c0fd07f17623b2"
+                "sha256:257de92a9d50a60b8e22abfcbb771571fde0dbf3ec234463212027a4eeecbe9a",
+                "sha256:e728ca814a823bf7bf60162daf9db95b93d532948c4c0bea762ce62f60189078"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==67.6.0"
+            "version": "==67.6.1"
         },
         "typing-extensions": {
             "hashes": [
diff --git a/python_boilerplate/demo/pgp_usage.py b/python_boilerplate/demo/pgp_usage.py
new file mode 100644
index 0000000..6b5ed97
--- /dev/null
+++ b/python_boilerplate/demo/pgp_usage.py
@@ -0,0 +1,42 @@
+from typing import Final
+
+from loguru import logger
+from pgpy import PGPKey
+
+from python_boilerplate.common.common_function import get_resources_dir
+
+_alice_public_key_path = (
+    get_resources_dir()
+    / "pgp-keys/Johnny Miller's PGP Example - Alice_0x3A9AA381_public.asc"
+)
+alice_public_key: Final[PGPKey] = PGPKey.from_file(_alice_public_key_path.__str__())[0]
+_alice_secret_key_path = (
+    get_resources_dir()
+    / "pgp-keys/Johnny Miller's PGP Example - Alice_0x3A9AA381_SECRET.asc"
+)
+alice_secret_key: Final[PGPKey] = PGPKey.from_file(_alice_secret_key_path.__str__())[0]
+
+_bob_public_key_path = (
+    get_resources_dir()
+    / "pgp-keys/Johnny Miller's PGP Example - Bob_0xAF34CAD3_public.asc"
+)
+bob_public_key: Final[PGPKey] = PGPKey.from_file(_bob_public_key_path.__str__())[0]
+_bob_secret_key_path = (
+    get_resources_dir()
+    / "pgp-keys/Johnny Miller's PGP Example - Bob_0xAF34CAD3_SECRET.asc"
+)
+bob_secret_key: Final[PGPKey] = PGPKey.from_file(_bob_secret_key_path.__str__())[0]
+
+logger.warning(
+    f"""
+    Done reading PGP keys.
+    Alice PGP public key: {alice_public_key.fingerprint}
+                 created: {alice_public_key.created}
+    Alice PGP SECRET key: {alice_secret_key.fingerprint}
+                 created: {alice_secret_key.created}
+    Bob's PGP public key: {bob_public_key.fingerprint}
+                 created: {bob_public_key.created}
+    Bob's PGP SECRET key: {bob_secret_key.fingerprint}
+                 created: {bob_secret_key.created}
+    """.lstrip()
+)
diff --git a/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Alice_0x3A9AA381_SECRET.asc b/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Alice_0x3A9AA381_SECRET.asc
new file mode 100644
index 0000000..7945466
--- /dev/null
+++ b/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Alice_0x3A9AA381_SECRET.asc	
@@ -0,0 +1,82 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+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diff --git a/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Alice_0x3A9AA381_public.asc b/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Alice_0x3A9AA381_public.asc
new file mode 100644
index 0000000..16f8cc7
--- /dev/null
+++ b/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Alice_0x3A9AA381_public.asc	
@@ -0,0 +1,41 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Bob_0xAF34CAD3_SECRET.asc b/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Bob_0xAF34CAD3_SECRET.asc
new file mode 100644
index 0000000..18ea5f6
--- /dev/null
+++ b/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Bob_0xAF34CAD3_SECRET.asc	
@@ -0,0 +1,82 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
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+eNXokI1ipeVw18bb6hg=
+=wwBM
+-----END PGP PRIVATE KEY BLOCK-----
diff --git a/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Bob_0xAF34CAD3_public.asc b/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Bob_0xAF34CAD3_public.asc
new file mode 100644
index 0000000..e7c3b2c
--- /dev/null
+++ b/python_boilerplate/resources/pgp-keys/Johnny Miller's PGP Example - Bob_0xAF34CAD3_public.asc	
@@ -0,0 +1,41 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
+mQGNBGQf/r4BDAC8zMbR57c4DPe81ln84f+R5DWR52bUo0T0ld7qMCwE8ZdjVZPE
+H74Km5DddQ6dthr8uVZsU3ecz+z9CLxvw15RiwNZisbnKdcQBAukGijViXx00ZAP
+0ZxilYzPwRYEnEadndH6QvjoUbbpqX4c72rEU7wH6kSb/O/e2EDysQRU6EmEZaFb
+IasSvzizgVBKvCuGUYrEpx1wrpFGVTFQfHig46xvMVusq2B4cFpzpAVPuM7o0tio
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+Qm9iIDxqb2hubnlzdml2YUBnbWFpbC5jb20+iQHRBBMBCAA7FiEEGjhhjs04g2aK
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+keWxmm5Qmp6yYVBzRw2QhgZ1q10YgptOCIt41eiQjWKl5XDXxtvqGA==
+=Nhm+
+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/tests/demo/test_pgp_usage.py b/tests/demo/test_pgp_usage.py
new file mode 100644
index 0000000..31ca1c5
--- /dev/null
+++ b/tests/demo/test_pgp_usage.py
@@ -0,0 +1,95 @@
+import textwrap
+
+import pgpy
+from loguru import logger
+from pgpy.constants import HashAlgorithm
+
+from python_boilerplate.demo.pgp_usage import (
+    alice_public_key,
+    alice_secret_key,
+    bob_public_key,
+    bob_secret_key,
+)
+
+
+def test_when_alice_sends_message_to_bob():
+    plaintext = "Hello World!"
+    signature = pgpy.PGPMessage.new(plaintext)
+    assert signature is not None
+    # sign a message
+    # the bitwise OR operator "|" is used to add a signature to a PGPMessage.
+    signature |= alice_secret_key.sign(signature, hash=HashAlgorithm.SHA512)
+    assert signature is not None
+    logger.info(f'The signature for "{plaintext}" is:\n{str(signature)}')
+    encrypted = bob_public_key.encrypt(signature)
+    assert encrypted is not None
+    logger.info(f"The signed encrypted is:\n{str(encrypted)}")
+
+    decrypted = bob_secret_key.decrypt(encrypted)
+    assert decrypted is not None
+    assert decrypted.message is not None
+    assert plaintext == decrypted.message
+    logger.info(f"The decrypted: {decrypted.message}")
+    verified = alice_public_key.verify(decrypted)
+    assert verified is not None
+
+
+def test_when_bob_sends_message_to_alice():
+    plaintext = "Hello World!"
+    signature = pgpy.PGPMessage.new(plaintext)
+    assert signature is not None
+    # sign a message
+    # the bitwise OR operator "|" is used to add a signature to a PGPMessage.
+    signature |= bob_secret_key.sign(signature, hash=HashAlgorithm.SHA512)
+    assert signature is not None
+    logger.info(f'The signature for "{plaintext}" is:\n{str(signature)}')
+    encrypted = alice_public_key.encrypt(signature)
+    assert encrypted is not None
+    logger.info(f"The signed encrypted is:\n{str(encrypted)}")
+
+    decrypted = alice_secret_key.decrypt(encrypted)
+    assert decrypted is not None
+    assert decrypted.message is not None
+    assert plaintext == decrypted.message
+    logger.info(f"The decrypted: {decrypted.message}")
+    verified = bob_public_key.verify(decrypted)
+    assert verified is not None
+
+
+def test_load_armor_ciphertext_and_then_verify():
+    message_text = textwrap.dedent(
+        """\
+        -----BEGIN PGP MESSAGE-----
+
+        wcDMA+ncLmW9GlBZAQv8DE6tT4ncRzg/+49v4lM93eksvHvJgl7vQ9FBnWN+VMrt
+        gySvhVUTh80lkrH1yWTxgpcclzO9TLb1yyxCIBm2tLkw4PUfZ863NlI/iYSQvo6f
+        3XFcYqhcjRtUqIb+6/twuAsL40Nj6pRXnHLCHdAvi1VotC8LsVC0aG5BozN+FDZV
+        TSLbaWuXrmY5dlR17Vguncaazp0G6MXg6dvyIP/OyBFn6r9W02/+BTfPR00pRQFt
+        oS58yPF+/NmeuC6mEBuR5hN93yWPo9DJgpf3bQrKbpecU6pmjalkXV7qsDZuNGVV
+        opEvis+PlU2jJVmwPT8eUIFNbz2d1HIOoF5GGBqvWchWaV19FbxcnF3qk/hBzzFh
+        mJLTcAKozcr/RPwY8ppdyOVmfjzdu802BAHrmtKYDj1Xz0+9nOP9tsKVHKaQ1wY4
+        d2zLjMj6a3q7sOBzABtarR5aKdKhibvrEGz27iWyVgJjQ5tTtB29gVZaBjn5yvfO
+        E6SgHc2XI+y+dWt6dFk30sFLAVEf7F88Sr0yZsBwMDcPgK7OGMkwcpU2iDkUp3Ww
+        7PTILmyAu0yL/mzTzPNBLUOwiWLz1TWfjReopZzlWi2SyKHAkYo0YcTGJoUDLFmy
+        gRaXs2VTEyGY4c1Ivxuy2+QRN9uVi3LKflL0Ay3/h8LXydVH7IO7xsCu+TDYiX5A
+        C+v8mP6ATzw/9bze4cnv9BR6guylpr1DyVHHNAkkvtGhNW0ASj5xFiWtOiVwxOm6
+        06jrD2BiE7KZdHIWgI07H0UnY7i0miVHVKmLgpr74Ctq5LqCTn14a42ObsJblghg
+        Wa+ymdMLNLsKsTu3G1XLiHF/xJjlVyFjykggqL0hAR1k3rRtShou/9iH90T2VTvr
+        HTV7EmXH6fn/NnTlMG4o1oTZf9vImGvUywdIsuxojV0bw1Kitf36x+Y+XY299JiW
+        6VqE5/MxPEE5GesBgjZeKJAZp+6x6GxnIijEaycDqYRMw80rEgzJyOhP9+JdJ6JS
+        v5YTAxagpLdnpwqJw6KQLjIHrZLSJNBxRJ5GcQ0hxUmlpxMz01eoNSePq2Nos5hf
+        4i2OabOo6Hy92BQG/czhIaXLt7rRbH05cYfYc6q+QXtTNIOEkJIQRfkUnMMvJKLq
+        QnqIc+AQ+Cx12LHKewpxAXm1gQfnKxUm5BwvgCmP1HklJgJa5MqpFjNeoPxiJkqc
+        ICtXJXKuK/MGXL2q8Q==
+        =I73S
+        -----END PGP MESSAGE-----
+        """
+    )
+    message = pgpy.PGPMessage.from_blob(message_text)
+    assert message is not None
+    decrypted = alice_secret_key.decrypt(message)
+    assert decrypted is not None
+    assert decrypted.message == "Hello World!"
+    verified = bob_public_key.verify(decrypted)
+    assert verified is not None
+    logger.info(f"{verified}")