On September 6th one of the world's biggest certificate authorities, GlobalSign, temporarily stopped issuing them following new claims by an assailant under the name "Comodo Hacker".

9月6日，在一个名为Comodo Hacker的黑客宣布入侵后，世界上最大的证书颁发机构GlobalSign临时停止发行证书。

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Given that the Comodo attack originated in Iran, some observers have speculated that it was part of an attempt by the Iranian government to find out more about protesters organising via web-based services.

BBC: Are secure websites still safe?