Questions tagged [message-recovery]

Message recovery is a feature of some digital signature schemes, whereas some or all of the message signed is embedded in the signature, recovered as part of signature verification, and thus needs not be transmitted.

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Elgamal security if same key used twice

Assume that user A sends to user B a message, unencrypted, and signs it with an Elgamal signature. Can some adversary, call it C, who eavesdrops, learn the private key if user A signed both messages ...
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Dining-Cryptographer Net (DC-Net) Scheme that Handles Collisions?

[Question edited at the request of Mods] I recently became fascinated with the elegant and simple solution that Chaum proposed for the Dining Cryptographers problem. If you are unfamiliar, please ...
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RC4: Find the complete plain text of a ciphertext when we know part of the plaintext

I need to decrypt an encrypted file with RC4 to answer to a Internet challenge. The file in question is a dump of a Teensy ROM and it is completely encrypted. Luckily, it looks like it's a standard ...
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An insecure signature with message recovery, Dan Boneh

Someone can help me to resolve this questions from the book of Dan Boneh (University of Standford)