Encryption using the crypt () function (one-way String hash), low security factor

You should use the complete result obtained by crypt () as the salt value for password verification to avoid problems caused by different hash algorithms. (As described above, the password hash based on the standard DES algorithm uses a 2-character salt value, but the MD5 algorithm uses a 12-character salt value.

Use the md5 () function to encrypt (use? RSA Data Security's MD5 packet algorithm calculates the MD5 hash value of str .), The security factor is higher than that of the crypt () function.

 "; $ Md5tostr = md5 ($ str); echo" encrypted: ". $ md5tostr;?>

Use the sha1 () function to encrypt (use? The US security hash algorithm 1 calculates the sha1 hash value of a string .)