Fast MAC algorithms?

[James A. Donald]

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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