重新排版一下…Orz
※ 引述《wakke (衝阿 去掉C)》之銘言：
列舉兩題
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
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