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. plainB. cipherC. publicD.private
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（ ）。
横线处应选（ ）。
A. plain
B. cipher
C. public
D.private
B. cipher
C. public
D.private
参考解析
解析：对称加密或私钥加密的基础是通信双方共享同一密钥。发送方使用一个密钥作为数学运算的一部分把明文加密成密文。接收方使用同一密钥把密文解密变成明文。在非对称或公钥加密方法中，每个用户使用两种不同的密钥:一个是只有这个用户知道的私钥;另一个是与其对应的任何人都知道的公钥。根据加密算法，私钥和公钥是数学上相关的。一个密钥用于加密，而另一个用于解密，依赖于实现的通信服务的特点而用法有所不同。此外，公钥加密技术也可以用于报文的数字签名。数字签名时使用发送方的私钥来加密一部分报文。当接收方收到报文时，就用发送方的公钥来解密数字签名，以便对发送方的标识进行验证。
相关考题：
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.A．binarytextB．hypertextC．plaintextD．supertext
Which encryption type is used to secure user data in an IPsec tunnel?() A. symmetric key encryptionB. asymmetric key encryptionC. RSAD. digital certificates
Which two statements regarding symmetric key encryption are true?() (Choose two.) A. The same key is used for encryption and decryption.B. It is commonly used to create digital certificate signatures.C. It uses two keys: one for encryption and a different key for decryption.D. An attacker can decrypt data if the attacker captures the key used for encryption.
Which of the following is used by RADIUS to encrypt messages between the server and the client?() A. Public keyB. CSU/DSUC. Private keyD. Shared secret
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 senders private key to encrypt some portion of the message. When the message is received, the receiver uses the senders （ ） key tp decipher the digital signature to verify the senders identity.A.host B.terminal C.sending D.receiving A.plain B.cipher C.public D.private A.plain B.cipher C.public D.private A.interpretation B.signatures C.encryption D.decryption A.plain B.cipher C.public D.private
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. interpretationB.signaturesC. encryptionD.decryption
Select the two correctstatements from the list below that describe DES and 3DES： （）A、 3DES is muchmore secure than DES.B、 Both DES and 3DES are stream ciphers.C、 DES uses 64 bitkeys， although the effective key lengthis only 56bits.D、 The decryption operation for both DES and 3DES is the same as the encryption operation.E、 DES can only be used for encryption， whereas 3DES can also be used for authentication.
Where parties do not have a shared secret and large quantities of sensitive information must be passed, the most efficient means of transferring information is to use Hybrid Encryption Methods. What does this mean?双方没有共享的密钥以及大量的敏感信息需要传输，最有效的用于信息传输的的方式是使用混合传输信息加密算法。这是什么意思？（）A、Use of software encryption assisted by a hardware encryption accelerator.使用由硬件加密加速器协助的软件加密B、Use of the recipient’s public key for encryption and decryption based on the recipient’s private key.使用接受方的公钥进行加密以及使用接受者的私钥既你想那个解密C、Use of public key encryption to secure a secret key，and message encryption using the secret key.使用公钥加密来加密秘密会话密钥，并且使用秘密会话密钥来加密信息D、Use of elliptic curve encryption.使用椭圆曲线加密
The RSA algorithm is an example of what type of cryptography?RSA算法是下面哪种算法的典型例子？（）A、Private Key.私钥B、Symmetric Key对称密钥C、Secret Key秘密密钥D、Asymmetric Key.非对称密钥
What is the effect of using the service password-encryption command?（）A、Only passwords configured after the command has been entered will beencrypted.B、Only the enable password will be encrypted.C、Only the enable secret password will beencryptedD、It will encrypt the secret password and remove the enable secret password from the configuration.E、It will encrypt all current and future passwords.
The enable secret password appears as an MD5 hash in a router’s configuration file， whereas the enablepassword is not hashed （or encrypted， if the password-encryption service is not enabled）. What is thereason that Cisco still support the use of both enable secret and enable passwords in a router’sconfiguration？（）A、The enable password is present for backward compatibility.B、Because the enable secret password is a hash， it cannot be decrypted. Therefore， the enable password is used to match the password that was entered， and the enable secret is used to verify that the enablepassword has not been modified since the hash was generated.C、The enable password is considered to be a router’s public key， whereas the enable secret password is considered to be a router’s private key.D、The enable password is used for IKE Phase I， whereas the enable secret password is used for IKE Phase II.
What is the effect of using the service password-encryption command?（）A、only passwords configured after the command has been entered will be encryptedB、Only the enable password will be encryptedC、Only the enable secret password will be encryptedD、It will encrypt the secret password and remove the enable secret password from the configurationE、It will encrypt all current and future passwords.
Which statement is true regarding a session key in the Diffie-Hellman key-exchange process?（）A、A session key value is exchanged across the network.B、A session key never passes across the network.C、A session key is used as the key for asymmetric data encryption.D、A session key is used as the key for symmetric data encryption.
Which of the following is used by RADIUS to encrypt messages between the server and the client?（）A、Public keyB、CSU/DSUC、Private keyD、Shared secret
Which encryption type is used to secure user data in an IPsec tunnel?（）A、symmetric key encryptionB、asymmetric key encryptionC、RSAD、digital certificates
Which two statements regarding asymmetric key encryption are true？（）A、The same key is used for encryption and decryption.B、It is commonly used to create digital certificate signatures.C、It uses two keys： one for encryption and a different key for decryption.D、An attacker can decrypt data if the attacker captures the key used for encryption
多选题Which three are distinctions between asymmetric and symmetric algorithms？ （）AOnly symmetric algorithms have a key exchange technology built inBAsymmetric algorithms are used quite often as key exchange protocols for symmetricalgorithmsCOnly asymmetric algorithms have a key exchange technology built inDAsymmetric algorithms are based on more complex mathematical computations
单选题What is the effect of using the service password-encryption comma（）。AOnly the enable password will be encrypted.BOnly the enable secret password will be encrypted.COnly passwords configured after the command has been entered will be encrypted.DIt will encrypt the secret password and remove the enable secret password fromthe configuration.EIt will encrypt all current and future passwords.
单选题You are designing a Windows Azure application that will generate events for multiple clients. Client web services might be behind NAT gateways. You need to recommend an approach that will allow you to broadcast the events to clients. What should you recommend？（）A Use ADO.NET Data Services and provide a shared key to clients.B Use Windows Azure Queues and provide a shared key to clients.C Use Windows Azure Table storage and providea shared key to clients.D Use the Windows Azure AppFabric Service Bus and provide a shared secret to clients.
单选题What is the objective of Diffie-Hellman？（）Aused to verify the identity of the peerBused between the initiator and the responder to establish a basic security policyCused to establish a symmetric shared key via a public key exchange processDused for asymmetric public key encryption
多选题Which two statements regarding asymmetric key encryption are true？（）AThe same key is used for encryption and decryption.BIt is commonly used to create digital certificate signatures.CIt uses two keys： one for encryption and a different key for decryption.DAn attacker can decrypt data if the attacker captures the key used for encryption
单选题The enable secret password appears as an MD5 hash in a router’s configuration file， whereas the enablepassword is not hashed （or encrypted， if the password-encryption service is not enabled）. What is thereason that Cisco still support the use of both enable secret and enable passwords in a router’sconfiguration？（）AThe enable password is present for backward compatibility.BBecause the enable secret password is a hash， it cannot be decrypted. Therefore， the enable password is used to match the password that was entered， and the enable secret is used to verify that the enablepassword has not been modified since the hash was generated.CThe enable password is considered to be a router’s public key， whereas the enable secret password is considered to be a router’s private key.DThe enable password is used for IKE Phase I， whereas the enable secret password is used for IKE Phase II.
单选题What is the effect of using the service password-encryption command?（）Aonly passwords configured after the command has been entered will be encryptedBOnly the enable password will be encryptedCOnly the enable secret password will be encryptedDIt will encrypt the secret password and remove the enable secret password from the configurationEIt will encrypt all current and future passwords.
多选题Which two statements regarding symmetric key encryption are true?（） (Choose two.)AThe same key is used for encryption and decryption.BIt is commonly used to create digital certificate signatures.CIt uses two keys: one for encryption and a different key for decryption.DAn attacker can decrypt data if the attacker captures the key used for encryption.
单选题Which statement is true regarding a session key in the Diffie-Hellman key-exchange process?（）AA session key value is exchanged across the network.BA session key never passes across the network.CA session key is used as the key for asymmetric data encryption.DA session key is used as the key for symmetric data encryption.
多选题Which two statements regarding asymmetric key encryption are true?（） (Choose two.)AThe same key is used for encryption and decryption.BIt is commonly used to create digital certificate signatures.CIt uses two keys: one for encryption and a different key for decryption.DAn attacker can decrypt data if the attacker captures the key used for encryption.
单选题What is the effect of using the service password-encryption command?（）Anly passwords configured after the command has been entered will be encrypted.BOnly the enable password will be encrypted.COnly the enable secret password will be encryptedDIt will encrypt the secret password and remove the enable secret password from the configuration.EIt will encrypt all current and future passwords.
单选题The architect accused of letting out the top secret of the key military project was found not guilty and was _____.AexcludedBdrivenCdischargedDdismissed