Client Puzzles A Cryptographic Defense Against Connection Depletion Attacks Ari Juels and John Brainard RSA Laboratories The Problem How to take down a restaurant Restauranteur Saboteur O.K., Mr. Smith Table for four at 8 o’clock. Name of Mr. Smith. Saboteur vs. Restauranteur
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A Cryptographic Defense Against Connection Depletion Attacks
Ari Juels and John Brainard
No More Tables!
A legitimate patron can easily reserve a table,
Would-be saboteur has too many puzzles to solve
Pair (X’, Y) is k-bit-hard puzzle
Avoids many flaws in other solutions, e.g.:
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