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This article mainly introduces the relevant knowledge of php data encryption technology and key security management methods, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value. I believe you will gain something after reading this php data encryption technology and key security management method article. Let's take a look at it.

One-way hash encryption

One-way hash encryption is an encryption algorithm that changes an arbitrarily long input message string into a fixed-length output string, and it is difficult to get the input string from the output string.

Common one-way hash functions:

MD5 (Message Digest Algorithm 5)

SHA (Secure Hash Algorithm)

MAC (Message Authentication Code)

CRC (Cyclic Redundancy Check)

Making use of this feature of single hash encryption, password encryption can be saved.

Several ways of dealing with passwords in PHP

MD5 (not recommended)

$password = md5 ($_ POST ["password"])

Reason: the encryption algorithm is relatively simple, and many sites that crack passwords store a large number of password strings encrypted by MD5.

SHA256 and SHA512 (not recommended)

$password = hash ("sha256", $password)

Reason: the encryption algorithm is relatively simple.

Salt value (extra string) (commonly used)

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