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For the record:

- The *cryptography* in Signal is probably fine; a practical attack would be a big surprise.

- Signal lacks specific features required for classified systems, such as security labels, certified identities, revocation, etc.

- Signal runs on uncontrolled, insecure platforms connected to the Internet, rendering it unsuitable for classified even if it had the above features.

- Adding classified features to Signal would make it unusable for most purposes for which it's intended.