问题
Is there a way to decrypt PBKDF2 password in java. Java has implementation of PBKDF2 algorithm as PBKDF2WithHmacSHA1. I got the code to create hashes for password. I referred to below link for hashing technique:
http://howtodoinjava.com/security/how-to-generate-secure-password-hash-md5-sha-pbkdf2-bcrypt-examples/
My requirement is to store the third Party FTP server password in the encrypted format and get back the password in plain text form from DB when there is a need to login into the server. Can anyone suggest best password encryption method?
回答1:
Note that PBKDF2 is a hashing-method rather than an encryption-method (to be precise: it is a method to derive an encryption-key from a password but it is frequently used as a password-hashing method as well). The whole point of PBKDF2 is to make it impossible to get the original password other than by brute-force guessing and make that as hard as possible too.
If you are talking about your users' passwords: you should not be able to get them in clear at all - if you did and let me know (e.g. by showing me my password) I'd instantly mark your whole site as insecure.
If you need to keep an encrypted password for your application to access another service then PBKDF2 is the wrong tool for the job, use a real encryption-algorithm like AES instead.
回答2:
No it's impossible by design! Wonder why?
Following 2 articles will answer all your questions: https://nakedsecurity.sophos.com/2013/11/20/serious-security-how-to-store-your-users-passwords-safely/ https://crackstation.net/hashing-security.htm
来源：https://stackoverflow.com/questions/42292832/decrypt-and-encrypt-using-pbkdf2-java