md5 unique

First, let's introduce the concept of MD5 and SHA1.MD5The full name of MD5 is message-digest algorithm 5 (Information-Digest algorithm). 128-bit length. At present, MD5 is an irreversible algorithm.It has high security. It corresponds to any string

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Comments: For a long time, MD5 encryption and verification are very secure. Many forums and software Save the password of the user name after MD5 encryption. Compared with the previous plaintext storage, the stored information after MD5 encryption

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The scenario for generating a unique ID is very common, such as temporary cache file names, temporary variables, temporary security codes, and so on, and the uniqid () function generates a unique ID based on the current time in microseconds. Because

C ++ implements md5 encryption or unique identification of computing files, and md5 Encryption I uploaded many classes on the network to implement md5 encryption for C ++. As for the class which is original, I dare not speculate. I just declare that

the MD5 algorithm has the following characteristics:1, compressibility: Any length of data, calculated the length of the MD5 value is fixed. 2, easy to calculate: It is easy to calculate the MD5 value from the original data. 3, anti-modification:

OrderIn the previous article, we introduced the most basic coding method--base64, and also briefly mentioned the principle of coding. This article continues to decrypt the series, of course, is also the introduction of a comparative basis of the

IOS MD5 encryption and iosmd5 Encryption 1. MD5 Encryption Message Digest Algorithm MD5 (the fifth version of the Message Digest Algorithm in Chinese) is a hash function widely used in the computer security field to provide Message integrity

[About whether md5 is enough] 50 thousand data, MD5 began to appear again! If you are confused about the database table pre_post, The Field id is automatically incremented and the primary key is used. The md5 field is unique. The initial field md5