[Cryptography] Anyone know of crypto hooks in webmail systems?

[Phillip Hallam-Baker]

Webmail is beginning to dominate. But adding end to end crypto to Webmail
is hard. Various platforms tout their extensibility. But finding a single
line of documentation is hard. And the documentation provided tends to be
pretty useless.

Extending webmail to handle OpenPGP or S/MIME or the next nest thing should
be fairly straightforward:

On reading: Just spawn off a separate viewer for the content type.

On composing: Activate the compose pane in a separate process so that Web
content can't see what is being done.

Anyone know of these or similar hooks?
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