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Re: Thoughts on a basic encryption mode
Uri,
You're right, not all algorithms use IVs in the form we
described. In my tutorial I use DES as a pedagogical symmetric
algorithm example and review the FIPS 81 modes and their
characteristics. However, many algorithms do make use of IVs, not
just DES, including some stream ciphers, so the concept, while not
universal, is fairly general.
I chose wireless as the example that has been cited by Phil,
but any low data rate path can raise similar concerns. Unlike the fat
addresses in the IPng header, one can't generally compress IVs.
Steve
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