On Mar 16, 2015, at 10:49 AM, Stephen Paul Weber
- Asymmetric algorithms, generally: RSA-ES, DSA.
Are you referring to Public Key Algorithms specifically here? in
particular, this table:
If so, RSA-ES (pubkey algorithm 1) is very widely used, even for keys
that are only marked for one usage (signatures or encryption). In fact,
i don't think there are many RSA keys labeled RSA-E (algo 2) and RSA-S
(algo 3) at all. Why treat RSA-ES separately for deprecation?
In fact, aren't the RSA-E and RSA-S algorithms basically just historical /
mostly deprecated in favour of marking keys for a particular use?
Yes. If I recall, they predate the "key flags" method of indicating the
intended purpose of a key. 4880 makes them SHOULD NOT generate, but
implementations are allowed to interpret them if they want to (I'd assume as a
type 1 RSA key with an implicit key flags saying encrypt-only or sign-only, but
that's just my reading).
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