[encryption] [encryption:high] rijndael yarrow fortuna tyche export tsu enc encryption crypt crypto cryptography cryptographically cipher public-key public key digitial signature plaintext block cipher des 3des triple des aes serpent blowfish twofish key size ecb cbc nonce ofb ctr ocb ccm cwc gcm symmetric symmetric key asymmetric key secure hash md5 sha sha-1 sha-224 sha-256 sha-384 sha-512 cbc-mac cmac hmac gmac secure channel diffie-hellman diffie hellman dh rsa alice bob negotiation pki kerberos kerb vpn certificate cert private key public key secret key revocation auth authn authnz authorization authenication root key key size salting secure token tls ssl https ftps ssh sftp pgp gpg pretty good privacy privacy [encryption:medium] secret hash signature parity secure ear ofac munition rnd random prng pseudorandom entropy key mac authority password salt padding token [encryption:low] block collision channel integrity seed reseed pool prime [encryption:very low] private public