Re: Beginner Qn: Encrypting small data

From: Karthikeyan (mahadevan_keyan_at_yahoo.com)
Date: 06/30/04 

Date: 30 Jun 2004 13:07:04 -0700

kackson@yahoo.com (kackson) wrote in message news:<90250227.0406300608.649ea30b@posting.google.com>...
> Hi.
> This is the first time I'm working to encrypt some data. So, any
> advise or pointer to sites or books are deeply appreciated.
>
> I need to encrypt ( and of course decrypt) data that is not larger
> than 500KB in real time (i.e. less than one fifth or 0.2 of a sec).
> Since the data is easily accessible by unauthorized users, I would
> also need the method to easily render the entire data useless once a
> single byte of information is altered. Are there existing algorithm or
> some combination of methods that could achieve that? Or should I read
> up more books and cook up my algorithm?
>
> Thanks in advance.

Handbook on Applied Cryptography ! This is free. There are numberous
websites which give you a lot of information. Google AES...
But from what I understand you need an encryption procedure that is
fast, so I would say symmetric key cryptosystems would be the best
bet. But the second part of your problem: does this mean the data is
on a server where everyone logs in. Then you would have to do some
access control mechanism and you should also update they keys. If you
are thinking about sending it on the wire then MAC is a solution
HTH
Karthik

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