Re: Reverseway algorithm (32767-bytes key) - full descryption.

From: James Preston (jgp@operamail.com)
Date: 12/20/02 

From: James Preston <jgp@operamail.com>
Date: 20 Dec 2002 14:49:39 +1100

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 19 Dec 2002 19:32:24 -0800, Bagrat Mirakian <mirakian@miraxus.com> wrote:
> The fifth step makes cipher unbreakable and impossible for decryption
> against any attacks such as differential and linear cryptanalysis.

Oh, dear. Using XOR to expand a key does not a One-Time-Pad make.

- --
James Preston
-----BEGIN PGP SIGNATURE-----

iD8DBQE+ApMwgXK32hUOOt0RAhqnAKDF2X2vMbD8Fr/ZfKGXf86L0TqdWACdGS4C
sSC8o0uXHhl0UwaQp7Bw1jI=
=04NZ
-----END PGP SIGNATURE-----

Relevant Pages

  • even better description of algoithm with an attempt at a security proof.
    ... K2 = xor Pi) ... Collisions are coincidental in stream mode as for example, ... plaintext attacks: ... Traffic analysis may leak information on the nonce and therefore n which is ...
    (sci.crypt)
  • Re: Crypto Mini-FAQ
    ... >> often that attacks are possible. ... >> checksum is linear. ... Nikita Borisov, Ian Goldberg, and David Wagner. ... linear checksums commute with xor. ...
    (sci.crypt)
  • Re: Encrypting passwords
    ... > be used the next time the user wants to invoke the application. ... >I would just need simple XOR encryption/ decryption. ... XOR each byte with a fixed value, and do the same thing again to ... MVP VC++ FAQ: http://www.mvps.org/vcfaq ...
    (microsoft.public.vc.language)
  • Re: simple math question
    ... linear cryptanalysis applies to stream ciphers. ... Look at all the broken LSFRs based designs (granted some of those ... attacks were correlation attacks but the basic premise still holds ...
    (sci.crypt)
  • Re: Minimal crypto OTP by dummie
    ... machine99 wrote: ... > Then combine the key with the message using XOR or another ... Adding modulo the number of characters will do. ... character flipping) attacks are still possible. ...
    (sci.crypt)