MD5 code can uniquely represent the characteristics of the original information and is usually used for encrypted storage of passwords, digital signatures, file integrity verification, etc.

MD in MD5 stands for Message Digest, which means message digest. However, this message digest is not an abbreviation of the message content, but a 128-bit mathematical transformation of the original message based on the public MD5 algorithm. (bit) feature code.

MD5 is widely used in encryption and decryption technology. In many operating systems, user passwords are saved in the form of MD5 values ??(or other similar algorithms). When the user logs in, the system The password entered by the user is calculated into an MD5 value, and then compared with the MD5 value saved in the system to verify the legitimacy of the user.