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Exam 8: Cryptography

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Question 51

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As DES became known as being too weak for highly classified communications,Double DES was created to provide a level of security far beyond that of DES._________________________

A) True
B) False

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Question 52

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A method of encryption that requires the same secret key to encipher and decipher the message is known as ____ encryption.

A) asymmetric
B) symmetric
C) public
D) private

E) A) and D)
F) C) and D)

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Question 53

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When an asymmetric cryptographic process uses the sender's private key to encrypt a message,the sender's public key must be used to decrypt the message.

To ____________________ means to encrypt,encode,or convert plaintext into the equivalent ciphertext.

The ____________________ cipher simply rearranges the values within a block to create the ciphertext.

Sequence encryption is a series of encryptions and decryptions between a number of systems,wherein each system in a network decrypts the message sent to it and then reencrypts it using different keys and sends it to the next neighbor,and this process continues until the message reaches the final destination.

Digital ____________________ are encrypted messages that can be mathematically proven to be authentic.

A ____ is a key-dependent,one-way hash function that allows only specific recipients (symmetric key holders) to access the message digest.

Julius Caesar was associated with an early version of the transposition cipher.

____ is the protocol used to secure communications across any IP-based network such as LANs,WANs,and the Internet.

The ____ algorithm was the first public key encryption algorithm developed (in 1977) and published for commercial use.

The 3DES implements a block cipher with a variable block length and a key length of 128,192,or 256 bits.

The permutation cipher simply rearranges the values within a block to create the ciphertext.

To use a(n)____________________ cipher,you substitute one value for another.

The application header protocol provides secrecy for the content of a network communication.

Internet Protocol Security is designed to protect data integrity,user confidentiality,and authenticity at the IP packet level._________________________

Standard-HTTP (S-HTTP)is an extended version of the Hypertext Transfer Protocol that provides for the encryption of individual messages transmitted via the Internet between a client and server.

In transport mode the entire IP packet is encrypted and is then placed as the content portion of another IP packet._________________________

The encapsulating security payload protocol provides secrecy for the contents of network communications as well as system-to-system authentication and data integrity verification.

You cannot combine the XOR operation with a block cipher operation.