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Sketch. Suppose you have an adversary against the composed scheme with advantage $\epsilon_3$. Observe that whenever you have a signature for the composed system, you have a signature for each of the three component signature schemes. It should then follow that a forger for the composed signature scheme can be turned into a forger for each of the three ...


Remember the “locked box puzzle” recounted on a “Security Now!” podcast (Episode #33, titled “Symmetric Block Ciphers”, 30 Mar 2006)? Steve Gibson says: … Leo and I answer last week's Puzzler/Brain-Teaser which explored the idea of using two private one-time pad "keys," like two padlocks, to securely convey a message between two parties, neither of ...

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