Modern & Applied Cryptography Breakers Intermediate
TEA's Equivalent Keys and the Xbox Hack
Every TEA key has three twins that encrypt identically, because flipping the top bits of two key words cancels in the round function. That one-bit quirk shrank TEA's key to 126 bits and let hackers forge a hash to break the original Xbox. This guide runs the real thing against real TEA.
12 min read