为达到完美向前和完美向后保密以及对付密码分析，需要更新组会话密钥。
In order to achieve perfect forward and perfect backward secrecy, and to counteract cryptoanalysis, the group session keys should be rekeyed.
为达到完美向前和完美向后保密以及对付密码分析，需要更新组会话密钥。
In order to achieve perfect forward and perfect backward secrecy, and to counteract cryptoanalysis, the group session keys should be rekeyed.
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