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so there is this post "Holographic Encryption with DARTIS" and the RSA came up. There is _RSA_crypt.7z from autoit-script.ru but the file is not available ( if anyone has the file, please get me a working link ) , so I don't know what or how it was done. My idea is to do the public key / private key (RSA) to exchange the hash/password ( call it what you will ), then, carry the rest of the communication with $CALG_AES_256 or the like. So it'd be doing a hybrid TCP/IP SSL, let's call it TCL 2.5 Anyhow, I need help for the simple reason that I'm quite clueless. CryptoAPI Cryptographic Service Providers may have a clue via the CryptoAPI ( but to me is all just words ). CryptEncrypt function say that: The Microsoft Enhanced Cryptographic Provider supports direct encryption with RSA public keys and decryption with RSA private keys. The encryption uses PKCS #1 padding. On decryption, this padding is verified. The length of plaintext data that can be encrypted with a call to CryptEncrypt with an RSA key is the length of the key modulus minus eleven bytes. The eleven bytes is the chosen minimum for PKCS #1 padding. The ciphertext is returned in little-endian format. so it should be possible from server 2003 / XP onwards. Thank you all who dare to go at it