Question 1

In the _________ mode the input to the encryption algorithm is the XOR of the current plaintext block and the preceeding ciphertext block; the same key is used for each block.

Accepted Answer

The answer of In the _________ mode the input to...

Question 2

The three most important symmetric block ciphers are: triple DES (3DES), the Advanced Encryption Standard (AES), and the ___________ .

Accepted Answer

The answer of The three most important symmetric block ciphers...

Question 3

All encryption algorithms are based on two general principles: _________, in which each element in the plaintext is mapped into another element, and transposition, in which elements in the plaintext are rearranged.

Accepted Answer

The answer of All encryption algorithms are based on two...

Question 4

Many symmetric block encryption algorithms including DES have a structure first described by _________ of IBM in 1973.

Accepted Answer

The answer of Many symmetric block encryption algorithms including DES...

Question 5

__________ is a stream cipher used in the Secure Sockets Layer/Transport Layer Security standards that have been defined for communication between Web browsers and servers and is also used in WEP and WPA protocols.

Accepted Answer

The answer of __________ is a stream cipher used in...

Question 6

The ________ source is drawn from the physical environment of the computer and could include things such as keystroke timing patterns, disk electrical activity, mouse movements, and instantaneous values of the system clock.

Accepted Answer

The answer of The ________ source is drawn from the...

Question 7

Two requirements for secure use of symmetric encryption are: sender and receiver must have obtained copies of the secret key in a secure fashion and a strong __________ is needed.

Accepted Answer

The answer of Two requirements for secure use of symmetric...

Question 8

A PRNG takes as input a fixed value called the ________ and produces a sequence of output bits using a deterministic algorithm.

Accepted Answer

The answer of A PRNG takes as input a fixed...

Question 9

Also referred to as conventional encryption, secret-key, or single-key encryption, _________ encryption was the only type of encryption in use prior to the development of public-key encryption in the late 1970's.

Accepted Answer

The answer of Also referred to as conventional encryption, secret-key,...

Quiz 2: Symmetric Encryption and Message Confidentiality