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Google made headlines when it went public with the fact that Chinese hackers had penetrated some of its services, such as Gmail, in a politically motivated attempt at intelligence gathering. The news here isn't that Chinese hackers engage in these activities or that their attempts are technically sophisticated -- we knew that already -- it's that the U.S. government inadvertently aided the hackers.
In order to comply with government search warrants on user data, Google created a backdoor access system into Gmail accounts. This feature is what the Chinese hackers exploited to gain access.
Somebody claiming to be the "Comodo hacker" has released a statement here
http://pastebin.com/74KXCaEZ and decompiled code here http://pastebin.com/DBDqm6Km. As a pentester who does attacks similar to what the ComodoHacker did, I find it credible. I find it probable that (1) this is the guy, (2) he acted alone, (3) he is Iranian, (4) he's patriotic but not political.The hacker describes the full details of his hack. Only Comodo can verify whether the precise details are correct. But, as a pentester who regularly does attacks like this, I can verify that the general details are correct.
Update: Interview with ComodoHacker