Re: bis-16 comments
Jon Callas <jon@callas.org> Mon, 08 May 2006 22:16 UTC
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From: Jon Callas <jon@callas.org>
Subject: Re: bis-16 comments
Date: Mon, 08 May 2006 14:52:30 -0700
To: David Shaw <dshaw@jabberwocky.com>
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On 25 Apr 2006, at 8:12 PM, David Shaw wrote: > > Section 5.1.2, Signature Types, says: > > There are a number of possible meanings for a signature, which are > specified in a signature type octet in any given signature. See > section 5.2.4, "Computing Signatures," for detailed information on > how to compute and verify signatures of each type. > > There are a number of possible meanings for a signature, which may > be indicated in a signature type octet in any given signature. > Please note that the vagueness of these meanings is not a flaw, > but > a feature of the system. Because OpenPGP places final authority > for > validity upon the receiver of a signature, it may be that one > signer's casual act might be more rigorous than some other > authority's positive act. > > The two opening sentences are redundant. Suggest: > > There are a number of possible meanings for a signature, which are > indicated in a signature type octet in any given signature. > Please note that the vagueness of these meanings is not a flaw, > but a feature of the system. Because OpenPGP places final > authority > for validity upon the receiver of a signature, it may be that one > signer's casual act might be more rigorous than some other > authority's positive act. See section 5.2.4, "Computing > Signatures," for detailed information on how to compute and verify > signatures of each type. > > (Combining the two) > Done. > ******************* > > Section 5.2.2, Version 3 Signature Packet Format has a sentence that > reads "The details of the calculation are different for DSA signature > than for RSA signatures." That should be "DSA signatures" (plural). > Done. > ******************* > > In section 5.2.3.12. Revocable, the second sentence reads "Packet body > contains a Boolean flag indicating whether the signature is > revocable." Suggest adding a "The" to read "The packet body > contains..." > Done. > ******************* > > In section 9.3. Compression Algorithms, suggest adding: > > Algorithm 0, "uncompressed," may only be used to denote a > preference for uncompressed data in the preferred compression > algorithms subpacket (section 5.2.3.9). Implementations MUST NOT > use uncompressed in Compressed Data Packets. > > (We had the same problem with using cipher algorithm 0 in encrypted > data packets, and made that MUST NOT as well) > I want to quibble over this one. The reason we don't allow 0 in encrypted packets is because we don't want to have "encrypted" data. It's a security reason. There's no security reason here. While it's perhaps stupid to make a compressed packet that has no compression (you could just have a literal packet), there is no *security* reason to object to it. Also, there's no particular code reason to object to it, either; you have to handle the case, and rather than error out, why not just proceed? Since these are the last call edits and this change could cause code changes -- someone who was handing compression-uncompressed would now have to make this an error, I'm not taking the edit. > ******************* > > In section 10.2. OpenPGP Messages, the paragraph beginning "In > addition, decrypting a Symmetrically Encrypted Data Packet" has a > blank line in the middle of the paragraph. > Done. > ******************* > > Section 12.5, DSA, has a sentence that reads "It MUST NOT implement a > DSA signature with a q size of less than 160 bits." That should be a > "DSA key" rather than a "DSA signature". > Done. > ******************* > > Section 13, Security Considerations says: > > * SHA384 requires the same work as SHA512. In general, there are > few reasons to use it -- you need a situation where one needs > more security than SHA256, but does not want to have the 512-bit > data length. > > Suggest: > > * SHA224 and SHA384 require the same work as SHA256 and SHA512 > respectively. In general, there are few reasons to use them > outside of DSS compatibility. You need a situation where one > needs more security than smaller hashes, but does not want to > have the full 256-bit or 512-bit data length. > Done, but I made them "SHA-" because if I don't, you'll find that nit in IETF Last Call. :-) > David > Jon
- bis-16 comments David Shaw
- Re: bis-16 comments Jon Callas
- Re: bis-16 comments David Shaw