Characterization and Improvement of Time-Memory Trade-Off Based on Perfect Tables

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Provided by: Association for Computing Machinery
Topic: Security
Format: PDF
Cryptanalytic time-memory trade-offs have been studied for twenty five years and have benefited from several improvements. The ensuing variants definitely improve the original trade-off but their real impact has never been evaluated in practice. The authors fill this lack by analyzing the perfect form of classic tables, distinguished point-based tables, and rainbow tables. They especially provide a thorough analysis of the latter variant, whose performances have never been formally calculated yet. Their analysis leads to the concept of a characteristic that enables to measure the intrinsic quality of a trade-off. They finally introduce a new technique based on checkpoints that still reduces the cryptanalysis time, by ruling out false alarms probabilistically.
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