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.

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I thought almost the exact same thing. I didn't think about revocation, but phones are not secure.