重新排版一下…Orz ※ 引述《wakke (冲阿 去掉C)》之铭言： 列举两题 43. When using public key encryption scheme, how to let A securely transmit a message to B, and let B believe that the message is indeed sent by A？ (A) use A’s public key to encrypt the message, and then use B’s private key to encrypt the previous encrypted message (B) use A’s private key to encrypt the message, and then use B’s public key to encrypt the previous encrypted message (C) use B’s public key to encrypt the message, and then use A’s private key to encrypt the previous encrypted message (D) use B’s private key to encrypt the message, and then use A’s public key to encrypt the previous encrypted message (E) none of the above 31. Which of the following is wrong？ (A) public key encryption is also called asymmetric key encryption because the encryption and decryption use different keys (B) private key encryption is also called symmetric key encryption because the encryption and decryption use the same keys (C) public key encryption scheme can be used for digital signature (D) PGP is used to secure email messages (E) all of the above are correct -- 欢迎大家一起加入Intel Philanthropic Peer-to-Peer Program !!! 这项「英特尔慈善『点对点连线』计画」旨在经由网际网路，把数百万部个人电脑连结 起来，加速研发治疗白血球过多症（血癌）的药物，从而把新药上市的需要时间缩短约 一半。对本计画有兴趣者，可以到http://www.grid.org/download/gold/download.htm 网站，下载该程式。 一旦一批资料处理完毕，下次电脑连接上网际网路时，不论经由宽频或拨接，电脑便会 --

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