Cryptography UK 6

In stream cipher For each bit, a different “key” is used

• True

• False

PRNG

• Pseudorandom number generators

• Position random number generators

• Pseudo Rational number generators

• Pseudo random nonce generators

If the Key stream depends on Plain Text/Cipher Text the it is known as.............................................................

• Self Synchronous Stream Ciphers

• Synchronous Stream Ciphers

• ASynchronous Stream Ciphers

• One time pad

In RC 4 stream cipher Data stream is simply..............................with the generated key sequence

• XOR

• OR

• NOT

• NAND

What is the size of the State table in RC 4 ?

• 196

• 64

• 256

• 512

Which of these is not a feature of RC4 algorithm?

• Symmetric stream cipher

• Variable key length

• Very quick in software

• Used for secured communications as in the encryption of traffic to and from secure web sites using the SSL protocol

• Very Hard in software implementation

Mobile phone network (GSM/3G)’s Stream cipher encryption algorithm uses

• A5/ 1

• A5/ 3

• A4/ 1

• A3/ 1

How many shift registers are used in A5/1 Encryption algorithm

• 3

• 2

• 4

• 5

Stream cipher encryption algorithm A5/1 is used in which technology?

• TLS

• SSL

• Microsoft P2P

• GSM

How many bits constitute 1 frame of cipher in A5/1 Algorithm

• 228

• 256

• 512

• 128