MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
Quiz
Cryptography Network Security
Cryptography Multiple Choice
Quiz 1
1
2
3
4
5
6
7
8
9
10
11
12
Q.1
RC5 encryption uses Right shift and decryption uses Left shift.
a) True
b) False
Q.2
The below round is the last step in encryption /decryption in RC5.
a) True
b) False
Q.3
The code bellow is the RC5 encryption pseudo code in C language.
a) The left shift operation (should be right shift)
b) The right shift operation (should be left shift)
c) LEi-1 and REi-1 should be LEi and REi
d) The for loop runs from 1 to r-1 ( not 1 to r)
Q.4
“RC5 uses the Feistel Structure.”
a) True
b) False
Q.5
Find the error in the Decryption pseudo code for RC5 –
a) B= RD0 + S [1];
b) for i = 1 to r do
c) LDi-1 = ((LDi – S [2xi] >>> RDi-1) ⊕ RDi-1);
d) A = LD0 – S [0];
Q.6
Which one of the following is not a RC5 mode of operation?
a) RC5 block cipher
b) RC5-Cipher Block Chaining
c) RC5-Cipher Padding
d) RC5-CipherText Stealing
Q.7
Which RC5 mode will have the ciphertext longer than the plaintext by at most the size of a single RC5 block?
a) RC5 block cipher
b) RC5-Cipher Block Chaining
c) RC5-Cipher Block Chaining Pad
d) RC5-CipherText Stealing
Q.8
Which RC5 mode of operation is this?
a) RC5 block cipher
b) RC5-Cipher Block Chaining
c) RC5-Cipher Block Chaining Pad
d) RC5-CipherText Stealing
Q.9
Which of these is not a characteristic of block ciphers?
a) Variable key length / block size / number of rounds
b) Mixed operators, data/key dependent rotation
c) Key independent S-boxes
d) More complex key scheduling
Q.10
Which one of the following RC4 algorithm not used in?
a) SSL
b) TLS
c) FTP
d) WEP
Q.11
Till when was the RC4 algorithm kept a secret?
a) 1990
b) 1992
c) 1996
d) 1994
Q.12
RC4 algorithm uses the concept of Block Cipher System.
a) True
b) False
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page