[144664] in cryptography@c2.net mail archive
Re: Fast MAC algorithms?
daemon@ATHENA.MIT.EDU (James A. Donald)
Sun Aug 2 12:59:59 2009
Date: Sun, 02 Aug 2009 17:55:17 +1000
From: "James A. Donald" <jamesd@echeque.com>
Reply-To: jamesd@echeque.com
To: Joseph Ashwood <ashwood@msn.com>
CC: cryptography@metzdowd.com
In-Reply-To: <BLU0-SMTP86F782DAE8CA6AD95986F2AC110@phx.gbl>
Joseph Ashwood wrote:
>>> RC-4 is broken when used as intended.
> ...
>>> If you take these into consideration, can it be used "correctly"?
James A. Donald:
>> Hence "tricky"
Joseph Ashwood wrote:
> By the same argument a Viginere cipher is "tricky" to use securely, same
> with monoalphabetic and even Ceasar. Not that RC4 is anywhere near the
> brokenness of Viginere, etc, but the same argument can be applied, so
> the argument is flawed.
You cannot use a Viginere cipher securely. You can use an RC4 cipher
securely: To use RC4 securely discard the first hundred bytes of
output, and renegotiate the key every gigabyte.
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