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Encryption is worthwhile because even if the NSA has decryption capabilities that they have kept secret, the very secrecy of this ability is valuable enough to strongly discourage its use.

It is extremely unlikely that your email is important enough to the NSA for them to risk disclosing their ability and pushing everyone to different or stronger algorithms.

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Mmmm, though that depends how effectively can credibly you can publish them attacking you that way.

Well, to a degree. It also depends on the extent to which the NSA believes they can trust their low/mid-level analysts: after the recent incident with Snowden, I'd argue "not much".

The more widely they allow such attacks to be used, the more people need know of its existence, and the greater their risk of exposure (even if the victims of these attacks are themselves oblivious).

Depending on who we're imagining as the victim, you also don't necessarily have to publish at all.

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