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Hi everybody, I have a typical situation here. I am ...

<< Back to: Cryptography FAQ (01/10: Overview)

Question by V.Girish
Submitted on 8/27/2003
Related FAQ: Cryptography FAQ (01/10: Overview)
Rating: Not yet rated Rate this question: Vote
Hi everybody,

  I have a typical situation here. I am
developing an encryption tool.

Situation :-

    I need to authenticate the username and
  password combination. I am planning to do
  that using SHA2. Based on that "message
  digest", i am going to generate a key for
  encryption /decryption. This is done
  because i dont want to store the key on
  disk.

Question :

  Incase, my user wants to change the user
  name and password combination later, how
  do i go about it ?

  The user should be able to decrypt files
  that were previously encrypted using the
  old username and password combination.

  Do you have any ideas about how i should
  do it ?

Note: The encryption that i use is
symmetric. It uses the same key for both
Encryption and Decryption.

  Thanking you very much for your time.Have
a nice day.

Regards,
V.Girish


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