Software by XenoSystems:

Encrypt and decrypt data using the latest industry standard strong encryption algorithms. Supports both traditional secret-key encryption as well as public-key encryption. Supports the newly adopted AES (US Advanced Encryption Standard) secret-key encryption algorithm 128, 192 or 256-bit keys. Uses the modern SHA-2 and/or Haval hashing algorithms. Decrypt almost any standard encrypted file. Free reader mode for sharing encrypted and signed files.