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Since you already trust the server to securely delete the plaintext message after decrypting it for a client, you can trust it to delete the encrypted versions too. So for instance the case of 3 keys K1 .. K3 and plaintext P, store K1(P), K1(K2(P)),K1(K2(K3(P))) since they all start with K1, that is the only key that can be used at first. after K1 is ...

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