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Developers claim crack for Siri security

updated 05:00 pm EST, Mon November 14, 2011

Could theoretically put Siri on many devices

Developers at Applidium say they have cracked the security scheme behind Apple's Siri voice command system. Siri use is normally restricted to the iPhone 4S, although limited success has been had in bringing it to earlier iOS devices. Applidium, however, says it has managed to crack Siri in a way that could allow it to be inserted into apps on many different platforms, even Android.

A set of access tools has been released to developers. One catch however is even in cracked form Siri requires the UDID of a 4S, which tells Apple that a device is authorized. A UDID is relatively easy to obtain using Applidium's tools, but Apple could conceivably decide to block an identity if it decides activity is suspicious, creating havoc on multiple devices at once.

In investigating Siri, Applidium says it has learned several other details about how the technology works. Words spoken on the user's end are compressed using the VoIP-oriented Speex codec. The Siri protocol is also described as "very, very chatty," sending many pieces of information back and forth; when a person is using text-to-speech, for instance, Apple servers reportedly send back confidence scores, and timestamps for each word.

by MacNN Staff



  1. aristotles

    Joined: Dec 1969


    Stop calling them developers

    These guys are not developers because they are leeching off the tech of other people with "hacks" rather than coming up with something unique themselves. Hackers != developers.

    As developer and iPhone 4S user, I want these idiots to get a life.

  1. King Bob On The Cob

    Joined: Dec 1969


    Hackers are developers...

    Developers build on each other's backs all the time, or are you trying to say that you don't use any of the Cocoa frameworks in your work? They reverse engineered a protocol, which not something you should scoff and de-legitimize. Never assume you know more than someone who is curious about how something works and takes the time to pull it apart and understand it. Heck, the "hackers" you're deriding write huge complex codebases and may understand the OS they're writing for better than you do.

    Also, they're actual legitimate iOS developers, as you can see here:

  1. The Vicar

    Joined: Dec 1969


    Oooh, hey, great idea.

    I'm sure that this won't get them sued at all.

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