.NET Cryptography Community

Choosing the right hash algorithm for password storage

Posted by JaneDoe on Sep 12, 2025

Discussion about Argon2 vs PBKDF2 vs BCrypt in .NET 8.

Encrypting large files with AES-GCM streams

Posted by CryptoGuru on Sep 10, 2025

Implementation details using System.Security.Cryptography.

Understanding .NET's RSA implementation

Explore how RSA keys are generated, stored, and used in .NET 8.

Secure random numbers with RandomNumberGenerator

Best practices for generating cryptographically strong randomness.

AES Encryption Helper

using System.Security.Cryptography;
public static class AesHelper
{
    public static (byte[] Cipher, byte[] IV) Encrypt(byte[] plain, byte[] key)
    {
        using var aes = Aes.Create();
        aes.Key = key;
        aes.GenerateIV();
        using var encryptor = aes.CreateEncryptor();
        var cipher = encryptor.TransformFinalBlock(plain,0,plain.Length);
        return (cipher, aes.IV);
    }
    public static byte[] Decrypt(byte[] cipher, byte[] key, byte[] iv)
    {
        using var aes = Aes.Create();
        aes.Key = key;
        aes.IV  = iv;
        using var decryptor = aes.CreateDecryptor();
        return decryptor.TransformFinalBlock(cipher,0,cipher.Length);
    }
}

Generating a PBKDF2 hash

using System.Security.Cryptography;
public static string HashPassword(string password, byte[] salt, int iterations = 100_000)
{
    var pbkdf2 = new Rfc2898DeriveBytes(password, salt, iterations, HashAlgorithmName.SHA256);
    var hash = pbkdf2.GetBytes(32);
    return Convert.ToBase64String(hash);
}