clean up old iv references

docs/encryption-specs.md

@@ -9,7 +9,6 @@
     - [`consensus_seed_exchange_privkey`](#consensus_seed_exchange_privkey)
     - [`consensus_io_exchange_privkey`](#consensus_io_exchange_privkey)
     - [`consensus_state_ikm`](#consensus_state_ikm)
-    - [`consensus_state_iv`](#consensus_state_iv)
   - [Bootstrap Process Epilogue](#bootstrap-process-epilogue)
 - [Node Startup](#node-startup)
 - [New Node Registration](#new-node-registration)
@@ -115,19 +114,6 @@ consensus_state_ikm = hkdf({
 }); // 256 bits
 ```
 
-### `consensus_state_iv`
-
-TODO reasoning
-
-- `consensus_state_iv`: An input secret IV to prevent IV manipulation while encrypting contracts' state.
-
-```js
-consensus_state_iv = hkdf({
-  salt: hkfd_salt,
-  ikm: consensus_seed.append(uint8(4)),
-}); // 256 bits
-```
-
 ## Bootstrap Process Epilogue
 
 TODO reasoning
@@ -158,7 +144,6 @@ TODO reasoning
   - The remote attestation proof that the node's Enclave is genuine.
   - `registration_pubkey`
   - 256 bits true random `nonce`
-  - 256 bits true random `iv`
 
 ## On the consensus layer, inside the Enclave of every full node
 
@@ -337,15 +322,15 @@ if (current_state_ciphertext == null) {
   // field_name doesn't yet initialized in state
   ad = sha256(encrypted_field_name);
 } else {
-  // read previous_ad, verify it, calculate new iv
+  // read previous_ad, verify it, calculate new ad
   previous_ad = current_state_ciphertext.slice(0, 32); // first 32 bytes/256 bits
   current_state_ciphertext = current_state_ciphertext.slice(32); // skip first 32 bytes
 
   aes_128_siv_decrypt({
     key: encryption_key,
     data: current_state_ciphertext,
     ad: previous_ad,
-  }); // just to authenticate previous_iv
+  }); // just to authenticate previous_ad
   ad = sha256(previous_ad);
 }