Bar-Mitzva Attack: Breaking SSL with 13-Year Old RC4 Weakness
summary
Shows that the old RC4 invariance weakness lets an attacker recover least‑significant bits of TLS plaintext when a weak key occurs with 2^-24 weak-key probability, requiring about 1 billion connections (or 2^24 trials) to hit and track a hit. Uses statistical keystream LSB‑difference analysis to predict the first 100 bytes LSB leakage (first bit ~0.68, 37th ~0.546, 100th ~0.503), enabling accelerated dictionary, cookie and card guesses and a practical passive eavesdropping variant; result: RC4 must be disabled.
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chapters (19)
- 0:00Intro
- 0:32Why Bar Mitzvah?
- 3:26TLS Objectives
- 5:27TLS Security
- 6:34RC4 Usage in TLS
- 7:32Stream Ciphers
- 9:11RC4 Algorithm
- 10:39RC4 (In)Randomness
- 12:00RC4 Initialization
- 13:36The Invariance Weakness
- 19:00Weak Key Classes
- 19:49Plaintext Leakage
- 25:49The Attack Basic Scenario
- 27:52LSB Leakage
- 28:36LSB for Weak Passwords
- 29:53LSB for Credit Card Numbers
- 32:57BEAST-like Attack
- 41:52Summary
- 42:35Conclusions
