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I was capturing my own packets from my iPhone 4 when I was using iMessage, with WireShark, for my Computer Networks class, and I was wondering, given the encrypted data below, how could I decrypt the message so I could see the message that I sent?
Based on the jumble of text you’ve linked to for the data part of the iMessage, it’s highly unlikely that anyone is going to decrypt this unless you had insider information. Apple should be using strong encryption algorithms (such as AES) for its iMessage protocol. I’d bet that if you sent the exact same iMessage to the exact same destination, you’re going to get different encrypted data. You could imagine the privacy issues that would arise if people could easily discern an encrypted ‘yes’ message vs. a ‘no’ message.
Furthermore, these encryption algorithms base their security on mathematical problems (eg. discrete logarithm problems, prime factorization) which are very hard to compute.