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Would there be a minimum ciphertext size that is related to the public key size? It depends on the algorithms used. An RSA signature, without any bells and whistles, is equal to the key length in size (i.e. 2048 bits for 2048-bit RSA). Likewise raw RSA encryption adds the same. So if you just use both, you add twice the key length, or 512 bytes for a ...

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