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Offline Submission With RSA Time-Lock Puzzles

The authors introduce a non-interactive RSA time-lock puzzle scheme whose level of difficulty can be arbitrarily chosen by artificially enlarging the public exponent. Solving a puzzle for a message m means for Bob to encrypt m with Alice's public puzzle key by repeated modular squaring. The number of squarings to perform determines the puzzle complexity. This puzzle is non-parallelizable. Thus, the solution time cannot be shortened significantly by employing many machines and it varies only slightly across modern CPUs. Alice can quickly verify the puzzle solution by decrypting the cipher-text with a regular private key operation.

Provided by: Institute of Electrical & Electronic Engineers Topic: Networking Date Added: Aug 2010 Format: PDF

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