3DES(Triple DES): Based on DES, a piece of data is encrypted three times with three different keys, which is more powerful; RC2 and RC4: It is faster to encrypt a large amount of data with variable-length keys than DES; Idea (International Data Encryption Algorithm) is an international data encryption algorithm, which uses 128 bit key to provide very strong security. RSA: Invented by RSA Company, it is a public key algorithm that supports variable-length keys, and the fast length of the file to be encrypted is also variable. DSA (Digital Signature Algorithm): Digital signature algorithm, which is a standard DSS (Digital Signature Standard); AES(Advanced Encryption Standard): Advanced encryption standard, which is the next generation high-speed and high-security encryption algorithm standard. At present, one implementation of AES standard is Rijndael algorithm; BLOWFISH, which uses a variable-length key, can reach 448 bits in length and runs very fast; Other algorithms, such as ElGamal, Deffie-Hellman, new elliptic curve algorithm ECC, etc.