On Fri, May 17, 2013 at 2:06 PM, Jeffrey Goldberg <[email protected]> wrote:
> On 2013-05-16, at 3:50 PM, william yager <[email protected]> wrote:
>
>> I'm curious how, when I add a new device to my iMessage account, all my old 
>> IMs show up in the chat history on the *new* device. If my understanding is 
>> correct, it appears that someone who possesses a cleartext copy of the 
>> messages is re-encrypting them with the new device's public key.
>
> Off the top of my head, I can't think of a plausible explanation other than 
> Apple keeping a copy of those messages around in either plaintext or in a 
> form that they can decrypt on their own.
>
These seems relevant....

Dr. Green's blog:
http://blog.cryptographyengineering.com/2012/08/dear-apple-please-set-imessage-free.html

    and

http://www.computerworld.com/s/article/9230388/Apple_pushes_iMessage_after_SMS_spoof_revealed_but_tech_under_patent_cloud

Jeff
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