On Tue, Nov 19, 2013 at 10:39:00AM +0100,
 Eliot Lear <[email protected]> wrote 
 a message of 55 lines which said:

> in fact there are several different forms.

I find three:

1) Encryption without a peer-specific arrangement. This is the meaning
used in RFC 4322. Can be safe.

2) Encryption without authentication. This is the meaning used in RFC
5386. Safe only against a purely passive attacker.

3) Encryption with a fallback to unencrypted mode. This is the
Wikipedia definition. Certainly unsafe.

draft-cooper-ietf-privacy-requirements-01 mixes 1) and 2)

> As such, it's a good opportunity for an informational document.

Volunteers are welcome to start from the list above :-)
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