问题
I have saved user passwords in MD5 form in my database, now I want to send password to users in plaintext, is there any way I can convert an MD5 string to plaintext?
回答1:
Md5 is a hashing algorithm. There is no way to retrieve the original input from the hashed result.
If you want to add a "forgotten password?" feature, you could send your user an email with a temporary link to create a new password.
Note: Sending passwords in plain text is a BAD idea :)
回答2:
you can use this http://www.md5decrypt.org/ or this http://md5.gromweb.com/ it will decrypt your md5 code
回答3:
The idea of MD5 is that is a one-way hashing, so it can't be once the original value has been passed through the hashing algorithm (if at all).
You could (potentially) create a database table with a pairing of the original and the MD5 values but I guess that's highly impractical and poses a major security risk.
回答4:
I you send passwords to users in an email, you might as well have no passwords at all.
You cannot reverse the MD5 function, so your only option is to generate a new password and send that to the user (preferably over some secure channel).
来源：https://stackoverflow.com/questions/8878388/how-to-convert-md5-string-to-normal-text