1)대칭키 암호화 . DES(Data Encryption Standard) . AES(Advanced Encryption Standard) . IDEA(International Data Encryption Algorithm) . SEED . ARIA(Academy, Research Institute, Agency) . RC5 2)공개키 암호화 . RSA(Rivest Shamir Adleman) . ECC(Elliptic Curve Crypto) . DSA(Digital Signature Algorithm) 3)해시암호 . MD(Message Digest) . SHA(Secure Hash Algorithm)