Re: [Cfrg] CFRG Crypto Panel review: draft-krovetz-rc6-rc5-vectors-00
"RFC ISE (Adrian Farrel)" <rfc-ise@rfc-editor.org> Thu, 18 April 2019 17:58 UTC
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Date: Thu, 18 Apr 2019 10:58:38 -0700
From: "RFC ISE (Adrian Farrel)" <rfc-ise@rfc-editor.org>
To: Yaron Sheffer <yaronf.ietf@gmail.com>
Cc: cfrg@irtf.org, Adrian Farrel <rfc-ise@rfc-editor.org>
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Subject: Re: [Cfrg] CFRG Crypto Panel review: draft-krovetz-rc6-rc5-vectors-00
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Thanks for this one, too, Yaron. Not as much flame as for draft-krovetz-ocb-wideblock, but equally clear. Again, I will be talking with Ted. Thanks, Adrian Yaron Sheffer wrote: > body p { margin-bottom: 0cm; margin-top: 0pt; } > Summary: this review was taken at the request of the ISE. He > asked that we pick one of: > > 1) this is a good idea and should be taken by CFRG > 2) this is a good idea and should be published in the Independent > Stream > 3) this is a good idea, but needs some fixes > 4) this is not a good idea and should not be published. > > I would pick #4, this is not a good idea. Formally, the document > lists test vectors for algorithms that are not properly > standardized. Pragmatically, I see no industry demand or need for > these two algorithms to be standardized today. > > Details: > > - RC5 is not used by any Internet protocols, to the best of my > knowledge, although it is specified for a few, e.g. ESP. It is > defined by the old RFC 2040 (published back in 1996, when we still > used to have 40-bit "export" keys, and cited by very few documents > since). > - RFC 2040 actually does have test vectors. > - For some reason RFC 2040 is cited as an informative, not a > normative reference for RC5. > - The I-D does not cite any standard as the authoritative reference > for RC6 (a patent does not count, and Google does not find the > cited normative reference). This seems to me a prerequisite > before we can publish test vectors. The document refers to the > algorithms' "specifications" and I fail to understand what this > means, in the case of RC6. Wikipedia has a link to a paper on Ron > Rivest's web page as their best authority. Academic papers on > cryptographic protocols are not anywhere near a formal standard, > as far as supporting implementors. > - The document makes security recommendations on how the algorithms > should be used, by including recommended parameter sets. This is > very good, but belongs in a normative specification of the algorithm > rather than a document that lists test vectors. > - The first RC6 test vector uses a 32-bit key, and the second a > 64-bit key. Both of which are not acceptable nowadays. Similarly for > RC5. > - Another test vector is missing the key, which I assume is a typo. -- Adrian Farrel (ISE), rfc-ise@rfc-editor.org
- [Cfrg] CFRG Crypto Panel review: draft-krovetz-rc… Yaron Sheffer
- Re: [Cfrg] CFRG Crypto Panel review: draft-krovet… RFC ISE (Adrian Farrel)