All TI Signing Keys Factored

Posted by Duncan on 13 September 2009, 00:13 GMT

In July, we reported on the factoring of the 0004 key, required for the signing of TI-83+ and TI-83+ SE OS updates. Thanks to an unprecedented community effort, all of TI's signing keys have been factored (Details on the United-TI thread), including both operating system and application signing keys for every upgradeable model.

The Nspire and Nspire CAS aren't included; very little is known about them yet.

These keys allow free user-created operating systems to be installed without having to use awkward work-arounds such as Free83P and FreeFlash. Free operating systems already exist for the TI-83+, the TI-89, and the TI-92+. As of this writing, none of the operating systems available on ticalc.org right now are signed, but we look forward to accepting signed OSes from authors.

To sign your own operating system or Flash apps, you will need Benjamin Moody's RabbitSign (Unix, Windows). For 68k calculators (TI-89 / TI-89 Titanium / TI-92+ / Voyage 200), Brandon Wilson's resign68k works as well.