cipher ID's

[vedaal at hush.com]

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?


vedaal

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