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I also agree this is a great idea. It's one of those things I wanted
to do a decade ago.
What we're talking about is creating a *profile* of the base
standard. The idea is that in general, you stick to the profile, and
the profile allows less work on implementers. If the profile is
successful in the wild, you can start deprecating the other features.
Here are some things I might put in a profile:
* Use only new-style headers and 5-byte lengths.
* Use only AES-128 or AES-256. You have to implement 3DES, but don't
* Use only RSA 4096 bit public keys
* Use SHA-256 and SHA-512 only.
* Never use anything but an iterated-and-salted S2K.
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