[ Home  |  FAQ-Related Q&As  |  General Q&As  |  Answered Questions ]

    Search the Q&A Archives

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

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.


Your answer will be published for anyone to see and rate.  Your answer will not be displayed immediately.  If you'd like to get expert points and benefit from positive ratings, please create a new account or login into an existing account below.

Your name or nickname:
If you'd like to create a new account or access your existing account, put in your password here:
Your answer:

FAQS.ORG reserves the right to edit your answer as to improve its clarity.  By submitting your answer you authorize FAQS.ORG to publish your answer on the WWW without any restrictions. You agree to hold harmless and indemnify FAQS.ORG against any claims, costs, or damages resulting from publishing your answer.


FAQS.ORG makes no guarantees as to the accuracy of the posts. Each post is the personal opinion of the poster. These posts are not intended to substitute for medical, tax, legal, investment, accounting, or other professional advice. FAQS.ORG does not endorse any opinion or any product or service mentioned mentioned in these posts.


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

[ Home  |  FAQ-Related Q&As  |  General Q&As  |  Answered Questions ]

© 2008 FAQS.ORG. All rights reserved.