针对国际上对日本食品安全性的担忧，粮农组织和世卫组织联合编写了以下问答材料。

The following questions and answers produced by the FAO and WHO address some of the growing international concerns over the safety of food produced in Japan.

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然后从两个层面对哈希函数的碰撞对问答认证的安全性可能产生的影响进行了分析。

Then we analyze the influence on the security of challenge-response authentication by collision of hash from two aspects.

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在随机问答器模型下讨论了签名具有某种特定形式的签名体制的安全性。

The security of the signature schemes whose signatures have specific form is discussed in the random oracle model.

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