diff --git a/common/ASC.Common/Utils/RandomString.cs b/common/ASC.Common/Utils/RandomString.cs
index 2a8d3bd77f2..a7adf92428e 100644
--- a/common/ASC.Common/Utils/RandomString.cs
+++ b/common/ASC.Common/Utils/RandomString.cs
@@ -25,6 +25,7 @@
 
 
 using System;
+using System.Security.Cryptography;
 using System.Text;
 
 namespace ASC.Common.Utils
@@ -35,10 +36,9 @@ public static string Generate(int length)
         {
             const string valid = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
             var res = new StringBuilder();
-            var rnd = new Random();
             while (0 < length--)
             {
-                res.Append(valid[rnd.Next(valid.Length)]);
+                res.Append(valid[RandomNumberGenerator.GetInt32(valid.Length)]);
             }
             return res.ToString();
         }
diff --git a/common/ASC.Core.Common/Encryption/EncryptionSettings.cs b/common/ASC.Core.Common/Encryption/EncryptionSettings.cs
index cdac5e98a1b..559a939b45d 100644
--- a/common/ASC.Core.Common/Encryption/EncryptionSettings.cs
+++ b/common/ASC.Core.Common/Encryption/EncryptionSettings.cs
@@ -172,16 +172,15 @@ public string GeneratePassword(int length, int numberOfNonAlphanumericCharacters
 
             if (num < numberOfNonAlphanumericCharacters)
             {
-                var random = new Random();
                 for (var j = 0; j < numberOfNonAlphanumericCharacters - num; j++)
                 {
                     int num3;
                     do
                     {
-                        num3 = random.Next(0, length);
+                        num3 = RandomNumberGenerator.GetInt32(0, length);
                     }
                     while (!char.IsLetterOrDigit(array2[num3]));
-                    array2[num3] = punctuations[random.Next(0, punctuations.Length)];
+                    array2[num3] = punctuations[RandomNumberGenerator.GetInt32(0, punctuations.Length)];
                 }
             }
 
diff --git a/common/ASC.Data.Storage/GoogleCloud/GoogleCloudStorage.cs b/common/ASC.Data.Storage/GoogleCloud/GoogleCloudStorage.cs
index 74d64519b6a..e2ebfb5ff05 100644
--- a/common/ASC.Data.Storage/GoogleCloud/GoogleCloudStorage.cs
+++ b/common/ASC.Data.Storage/GoogleCloud/GoogleCloudStorage.cs
@@ -32,6 +32,7 @@
 using System.IO;
 using System.Linq;
 using System.Net.Http;
+using System.Security.Cryptography;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
@@ -776,9 +777,7 @@ public override string UploadChunk(string domain,
 
             for (var i = 0; i < MAX_RETRIES; i++)
             {
-                var random = new Random();
-
-                millisecondsTimeout = Math.Min(Convert.ToInt32(Math.Pow(2, i)) + random.Next(0, 1000), 32 * 1000);
+                millisecondsTimeout = Math.Min(Convert.ToInt32(Math.Pow(2, i)) + RandomNumberGenerator.GetInt32(1000), 32 * 1000);
 
                 try
                 {
diff --git a/products/ASC.Files/Core/Model/FileWrapper.cs b/products/ASC.Files/Core/Model/FileWrapper.cs
index 39de1bef1b4..cc9160abed1 100644
--- a/products/ASC.Files/Core/Model/FileWrapper.cs
+++ b/products/ASC.Files/Core/Model/FileWrapper.cs
@@ -131,7 +131,7 @@ public static FileWrapper<int> GetSample()
                 //Updated = ApiDateTime.GetSample(),
                 //Created = ApiDateTime.GetSample(),
                 //CreatedBy = EmployeeWraper.GetSample(),
-                Id = new Random().Next(),
+                Id = 10,
                 RootFolderType = FolderType.BUNCH,
                 Shared = false,
                 Title = "Some titile.txt",
diff --git a/products/ASC.Files/Core/Model/FolderWrapper.cs b/products/ASC.Files/Core/Model/FolderWrapper.cs
index 55519827df4..6d5738bde67 100644
--- a/products/ASC.Files/Core/Model/FolderWrapper.cs
+++ b/products/ASC.Files/Core/Model/FolderWrapper.cs
@@ -80,14 +80,14 @@ public static FolderWrapper<int> GetSample()
                 //Updated = ApiDateTime.GetSample(),
                 //Created = ApiDateTime.GetSample(),
                 //CreatedBy = EmployeeWraper.GetSample(),
-                Id = new Random().Next(),
+                Id = 10,
                 RootFolderType = FolderType.BUNCH,
                 Shared = false,
                 Title = "Some titile",
                 //UpdatedBy = EmployeeWraper.GetSample(),
-                FilesCount = new Random().Next(),
-                FoldersCount = new Random().Next(),
-                ParentId = new Random().Next(),
+                FilesCount = 5,
+                FoldersCount = 7,
+                ParentId = 10,
                 IsShareable = null
             };
         }
diff --git a/web/ASC.Web.Core/Sms/SmsKeyStorage.cs b/web/ASC.Web.Core/Sms/SmsKeyStorage.cs
index c5dc7d9cf10..0d892d4398c 100644
--- a/web/ASC.Web.Core/Sms/SmsKeyStorage.cs
+++ b/web/ASC.Web.Core/Sms/SmsKeyStorage.cs
@@ -27,6 +27,7 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
+using System.Security.Cryptography;
 
 using ASC.Common;
 using ASC.Common.Caching;
@@ -120,7 +121,7 @@ public bool GenerateKey(string phone, out string key)
                     return false;
                 }
 
-                key = new Random().Next((int)Math.Pow(10, KeyLength - 1), (int)Math.Pow(10, KeyLength)).ToString(CultureInfo.InvariantCulture);
+                key = RandomNumberGenerator.GetInt32((int)Math.Pow(10, KeyLength - 1), (int)Math.Pow(10, KeyLength)).ToString(CultureInfo.InvariantCulture);
                 phoneKeys[key] = DateTime.UtcNow;
 
                 KeyCache.Insert(cacheKey, phoneKeys, DateTime.UtcNow.Add(StoreInterval));
diff --git a/web/ASC.Web.Core/Users/UserManagerWrapper.cs b/web/ASC.Web.Core/Users/UserManagerWrapper.cs
index 09133c0921f..0b058d1ffc7 100644
--- a/web/ASC.Web.Core/Users/UserManagerWrapper.cs
+++ b/web/ASC.Web.Core/Users/UserManagerWrapper.cs
@@ -27,6 +27,7 @@
 using System;
 using System.Globalization;
 using System.Net.Mail;
+using System.Security.Cryptography;
 using System.Text;
 using System.Text.RegularExpressions;
 
@@ -294,16 +295,14 @@ public static string GeneratePassword()
             return Guid.NewGuid().ToString();
         }
 
-        private static readonly Random Rnd = new Random();
-
         internal static string GeneratePassword(int minLength, int maxLength, string noise)
         {
-            var length = Rnd.Next(minLength, maxLength + 1);
+            var length = RandomNumberGenerator.GetInt32(minLength, maxLength + 1);
 
             var pwd = string.Empty;
             while (length-- > 0)
             {
-                pwd += noise.Substring(Rnd.Next(noise.Length - 1), 1);
+                pwd += noise.Substring(RandomNumberGenerator.GetInt32(noise.Length - 1), 1);
             }
             return pwd;
         }