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Brute forcing success: load any operating system onto your TI-83+ calculator
CrunchGear — ... TICalc.org brings us word that the key used to sign the TI-83+ OS has been factored, which means that any third-party OS can be signed similar to the original OS and loaded onto the calculator without resorting to tricks or helper programs. ...

TI-83 Plus OS signing key cracked
MAKE Magazine — Looks like it might be possible to run other OSes without additional software on the TI-83... The ever-mysterious Benjamin Moody posted a cryptic message on the United-TI forum yesterday. In it, he listed the factorization of the 512-bit RSA modulus used by TI's OS signing key for the 83+ (the "0004 key"). No other details are yet available about how he achieved this feat of substantial brute forcing power. In the event of United-TI downtime, Brandon Wilson has put a copy of Benjamin's values on his personal website. With this ...