網络安全期末复习题.docVIP

网络安全期末复习题填空题：The three key objectives of computer security are confidentiality,， Integrity and Availability （计算机安全的三个关键目标，必威体育官网网址性，完整性和可用性） Active Attack attempts to alter system resources or affect their operation.（主动攻击试图改变或影响其操作系统资源） Passive Attack attempts to learn or make use of information from the system but dose not affect system resources.（被动攻击试图学习或者从系统中而不影响系统资源利用信息。）The process of attempting to discover the plaintext or key is known as cryptanalysis （试图发现明文或密钥的过程称为密码分析）0Two types of passive attacks are the release of message contents and traffic analysis.（被动攻击的两种类型是消息分析和流量分析）A symmetric encryption scheme has five ingredients ,they are plaintext , encryption algorithm, decryption algorithm , secret key and ciphertext .（对称加密方案有五种成分，它们是明文，加密算法，解密算法，密钥和密文）The two general approaches to attacking a cipher are cryptanalysis and brute-force attack。（一般攻击密码的两种方法：密码分析和蛮力攻击））If the encryption algorithm of 3DES is C=E(K3 , D(K2 , E(K1 , P))) , then the decryption algorithm is P=D(K1(E(K2、D(K3、C)))) .（如果3DES加密算法是C = E（K3，D（E（K1，K2，P））），然后解密算法是P=D(K1(E(K2、D(K3、C)))) ）With RSA algorithm , if the n is easily factored into its two prime factors , then the algorithm will be obsolete .（对于RSA算法，如果n是容易分解成它的两个主要因素，那么算法将被淘汰）A Public key certificate consists of a public key plus a User ID of the key owner , with the whole block signed by a trusted third party .（一个公钥证书由公钥加上所有者的用户ID以及可信的第三方签名的整个数据块组成。）The SSL Record Protocol provides two services for SSL connections : Confidentiality and Message Integrity .（SSl记录协议提供SSl连接的两种服务：必威体育官网网址和消息完整性）To store the public private key pairs owned by the node and the public keys of other users known at this node , PGP provides a pair of data structures at each node . These data structures are referred to respectively , as the private-key ring and public key ring .（存储的公共密钥对由节点和其他用户在这个节点已知公钥拥有，PGP在每个节点提供了一种数据结构。这些数据结构被分别称为，私钥环和公钥环。）IPSec support two modes of use : transport mode and tunnel mode .（存储的公共密钥对由节点和IPSec支持两种使用方式：传输模式和隧道模式。0