digital signature数字签名
下面算法中，属于非对称密钥加密算法的是（53）。A.DES（Digital Encryption Standard） B.RC2（Rivest Ciphers 2） C.RC5（Rivest Ciphers 5） D.DSA（Digital Signature Algorithm）
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Symmetric, or private-key, encryption is based on a secret key that is shared by both communcating parties. The （ ） party uses the secret key as part of the mathematical operation to encrypt （ ） text to cipher text. The receiving party uses the same secret key to decrypt the cipher text to plain text. Asymmetric, or public-key, encryption uses two different keys for each user: one is a （ ） key known only to this one user; the other is a corresponding public key, which is accessible to anyone. The private and public keys are mathematically related by the encryption algorithm. One key ia used for encyption and the other for decryption, depending on the nature of the communication service being implemented. In addition, public key encryption technoligies allow digital （_______） to be placed on messages. A digital signature uses the sender's private key to encrypt some portion of the message. When the message is received, the receiver uses the sender's （） key tp decipher the digital signature to verify the sender's identity.横线处应选（ ）。A. interpretation B.signatures C. encryption D.decryption
Why does a digital signature CONTAIN a message digest?为什么数字签名包含一个消息摘要？（）A、To confirm the identity of the receiver 为了确认接收者的身份B、To indicate the encryption algorithm 为了标注加密算法C、To detect any alteration of the message 为了检测对消息的篡改D、To enable transmission in a digital format 为了便于进行数字格式传输
在数字版权保护（Digital Right Management，简称DRM）系统中，数字签名不能用于标记用户是否已购买授权。
DDN是（）的缩写。A、Digital Data NetB、Digital Data NetworkC、Digital Date NetD、Digital Date Network
Examine the following options ，when editing global IPS settings， which one determines if the IOS- basedIPS feature will drop or permit traffic for a particular IPS signature engine while a new signature for thatengine is being compiled？（）A、Enable Signature DefaultB、Enable Engine Fail ClosedC、Enable Default IOS Signature ActualTests.comD、Enable Fail Opened
在数字版权保护（Digital Right Management，简称DRM）系统中，单向散列函数结合数字签名可以对内容进行完整性检验。
