Introduction - If you have any usage issues, please Google them yourself
Symmetric/block ciphers are generally divided into stream encryption (eg, OFB, CFB, etc.) and block encryption (such as ECB, CBC, etc.). For streaming encryption, block cipher needs to be translated into the work flow model. The encryption block (or block cipher), If you want to encrypt the data block size more than on the need to involve filling and chain encryption mode, the text referred to, such as ECB and CBC encryption mode refers chain. This paper will be introduced the AES symmetric encryption/packet encryption/stream cipher and the ECB, CBC, CFB, OFB and CTR mode in five symmetric encryption.