Re: RC4, With Homebrew MAC...

From: Bartosz Zoltak (X_at_vmpcfunction.com;)
Date: 04/29/05

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Date: Fri, 29 Apr 2005 00:20:21 +0200

Użytkownik <aweston@connectfree.co.uk wrote:

> So, I ask. How about
> multiplying each unencrypted byte, with the RC4 byte, and
checksuming
> this value, to verify the packet has not been tampered with?

If you think about RC4 and using *standard* algorithms is not your
primary criteria, then you might use VMPC instead of RC4 and this way
avoid many attacks against RC4. You would also have an already made
dedicated MAC scheme with this cipher. If you like, you can find more
information at www.VMPCfunction.com

Bartosz

--
Bartosz Zoltak
http://www.vmpcfunction.com
X@vmpcfunction.com; X=bzoltak

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Relevant Pages

Re: A variation of RC4
... This scheme is quite a bit more complex than RC4, ... But still this would be a fast cipher. ... VMPC - described in the FSE VMPC paper, ... Bartosz Zoltak ...
(sci.crypt)
Re: RC4 - discard first n bytes
... > 'real' ciphertext. ... Ignore first 256 bytes of keystream genrated by RC4 and use the rest ... If you don't like to discard the initial outputs, you might use VMPC, ... Bartosz Zoltak ...
(sci.crypt)