I agree, this is why it should be the standard.

I wonder how this could be achieved.

If not, oh well!

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Once a secret is revealed, whether intentionally or not, it can never be concealed again without the use of force.

Adding some abilities to cover your trails never hurt!

I believe ephemeral keys or zero knowledge proofs may help with deleting data but it presumes every client will store only the encrypted version and consults the trusted oracle to decrypt the message.