Hot answers tagged algorithm-design
Yes, absolutely. Here is the standard construction to address this problem. Let $pk_1,\dots,pk_n$ be the public keys of the $n$ recipients. We pick a random symmetric key $k$, encrypt the message $m$ (using authenticated encryption) under key $k$ to get $c=AE_k(m)$, and then encrypt $k$ under each of the public keys. Finally, we form the whole ciphertext ...
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