New answers tagged smime
Is not the solution to encrypt with the recipient's public key? Anybody could have written it but only the intended receiver can read it.
RC2 is a currently "unbroken" block cipher; the best known attack is a "related-key attack", i.e. something which does not really apply in practice (related-key attacks are about specific properties when the victim uses two distinct keys, that the attacker does not know, but with a difference between them that the attacker knows). RC2 still has some ...
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