DEDECMS administrator password encryption analysis

Dedicated waiting

The Administrator account and password of zhimeng are saved in the dede_admin table of the database.
At first glance, I thought the password was encrypted with MD5, but there were 20 strange characters!
After careful analysis, the original password is set to 32 after MD5 encryption, and the first 5 digits and the last 7 digits are removed, and the total number is 20 digits.
So how to use it?
It is also easy to remove the first three digits and the last digit is the valid MD5 password.
For example, 8f2531f09a5c31f529c4
531f09a5c31f529c after simplification
Decrypted as Sroan