In a public-key cryptosystem,(71)encrypted with the public key can only be deciphered with the private key from the same(72). Co

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问题 In a public-key cryptosystem,(71)encrypted with the public key can only be deciphered with the private key from the same(72). Conversely,(71)encrypted with the private key can be decrypted only with the public key. Users can make their public keys(73)available or place them at a key distribution center or others to access. However, the private key must be(74)safe. In public-key systems there’s no(75)to find a safe channel for communicating a shared secret key.

选项 A、more
B、necessary
C、need
D、space

答案C

解析 在公钥加密系统中,以公钥加密的原文只能用来自同一对的私钥来解密。反过来,用该私钥加密的原文也只能用该公钥来解密。用户可以使它们的公钥自由地获得,或把公钥放到密钥分配中心或其他机构以供存取。但是,私钥必须保持安全。在公钥系统中,没有必要寻找安全通道来传送共享的密钥。
这是一道关于公钥加密系统的试题。在公钥系统中,密钥是成对出现的,一个叫公钥,一个叫私钥。在D小题中需要填入动词的过去分词形式,keep是个不规则动词,其过去分词形式是kept。在E小题中需要填入一个名字,而necessary 作为名词用时,其含义是“必需品”。need 作为名词用时,其含义是“需要,必要”。
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