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Article #21

Re: Encryption for a program.

#21
From: Peter Howkins
Date: Tue, 18 Aug 1998 00:00
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Chris rutter wrote
>Rob Kendrick <rob@kiwisoftware.demon.com.uk> wrote:
>
> > PGP will do the trick.  Accept nothing less. :)
>
> This sounds somewhat contrived; why would you want to use a
> specific implementation of a cipher?  There are are a variety
> of acceptable block and stream ciphers that could be used
> for this purpose (IDEA, Blowfish, Twofish, etc.), but all of
Erm, PGP uses IDEA. Blowfish is partially susceptable to differential
cryptanalysis (at reduced rounds). IDEA is probably the best bet, though

TEA (tiny encryption algorithm) has been shown to resist differntial
cryptanalysis
quite well.
> them are flawed by the simple problem that the `key' required
> to unlock the software can be spread by mouth.
The key is always the weakest link, why spend years brute forcing
the answer on computers, when you can threaten the rabbits of the
key owner and get it in 5 minutes :)

Peter
In a sadistic mood
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From: Peter Howkins <p.j.howkins@lboro.ac.uk>
Subject: Re: Encryption for a program.
Date: 1998/08/18
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