On Jun 24, 2008, at 6:10 PM, [EMAIL PROTECTED] wrote:

just curious // ? O.T.

gnupg lists the following cipher ID's for symmetric algorithms:

Home: ~/.gnupg
Supported algorithms:
Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA
Cipher: IDEA (S1), 3DES (S2), CAST5 (S3), BLOWFISH (S4), AES (S7),
AES192 (S8), AES256 (S9), TWOFISH (S10)


rfc-4880 section 9.2
lists (S5) and (S6) as "Reserved"
http://tools.ietf.org/html/rfc4880#section-9

reserved for what?
and why couldn't they just be added later in sequence after
whatever the
last accepted algorithm is?

They could have been. In the case of S5 and S6, they're marked as reserved because they were actually allocated at one point for SAFER- SK128 (S5) and DES/SK (S6). They're marked as reserved now to make sure they're not used by anyone for anything.

David

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