This popped up on Wikipedia's Cortana entry, and at first glance I thought it was some fan's BS posting or personal theory, but on reviewing the history logs of the page, the editor who added it claimed to be the fellow who designed an AI's parameters in the Halo Story Bible. Since it wasn't posted in any official capacity elsewhere (i.e. part of an interview or Weekly Update or anything similar) I wasn't sure if I could trust it; after all, this is the Internet; any mook could claim he's a Bungie employee and post BS. Following Wikipedia's policy of verifiability, we need proper confirmation or documentation as to whether this is true or not.
The entry in its entirety:
Although normally an AI needs a high-end computer core memory to reside in, the MJOLNIR Mark V armor system is equipped with a revolutionary crystal memory system that makes Cortana portable. Due to her extensive experience at infiltrating enemy systems and access to Naval Intelligence hacking routines, Cortana is also able to transfer from system to system even without the use of a hard-coded key like the one used by Captain Jacob Keyes. Contrary to some observations, Cortana does not reside on the "key card" that Captain Keyes transfers form the Pillar of Autumn's computer to the MJOLNIR suit -- this is merely the authorization key needed for Cortana to make the transfer from the ship's core memory to the memory matrix in the MJOLNIR suit. The need for a coded physical key is supposed to prevent AI from moving from system to system at will. Though Cortana is among the few AI who can get around this limitation with effort, it's a classified ability and she does not flaunt it.
Can this be officially verified as Halo canon?