Question - 1
In cryptography, what is a cipher?
- algorithm for performing encryption and decryption
- encrypted message
- both algorithm for performing encryption and decryption and encrypted message
- decrypted message
Solutions
Answer- A
Question - 2
In asymmetric key cryptography, the private key is kept by __________.
- sender
- receiver
- sender and receiver
- all the connected devices to the network
Solutions
Answer- B
Question - 3
Which one of the following algorithms are not used in asymmetric-key cryptography?
- rsa algorithm
- diffie-hellman algorithm
- electronic code book algorithm
- dsa algorithm
Solutions
Answer- C
Question - 4
Cryptanalysis is used __________.
- to find some insecurity in a cryptographic scheme
- to increase the speed
- to encrypt the data
- to make new ciphers
Solutions
Answer- A
Question - 5
Which one of the following is a cryptographic protocol used to secure an HTTP connection?
- resource reservation protocol
- explicit congestion notification (ECN)
- transport layer security (TLS)
- stream control transmission protocol (SCTP)
Solutions
Answer- C
Question - 6
An asymmetric-key(or public-key) cipher uses:
Answer- B
Question - 7
A straight permutation cipher or a straight P-box has the same number of inputs as:
- cipher
- frames
- outputs
- bits
Solutions
Answer- C
Question - 8
We use Cryptography term to transform messages to make them-
- secure and immune to change
- secure and immune to idle
- secure and immune to attacks
- secure and immune to defend
Solutions
Answer- C
Question - 9
The shift cipher is sometimes referred to as the:
- Caesar cipher
- shift cipher
- cipher
- cipher text
Solutions
Answer- A
Question - 10
The heart of Data Encryption Standard(DES), is the-
- cipher
- rounds
- encryption
- DES function
Solutions
Answer- D
Question - 11
The International Data Encryption Algorithm(IDEA) was developed by:
- Xuejia Lai and James Massey
- Xuejia Lai and Bruce Schneier
- Xuejia Lai and Carlisle Adams
- Xuejia Lai and Stafford Tavares
Solutions
Answer- A
Question - 12
ElGamal encryption system is __________.
- symmetric key encryption algorithm
- asymmetric key encryption algorithm
- not an encryption algorithm
- block cipher method
Solutions
Answer- B
Question - 13
Cryptographic hash function takes an arbitrary block of data and returns _________.
- fixed size bit string
- variable size bit string
- both fixed size bit string and variable size bit string
- variable sized byte string
Solutions
Answer- A
Question - 14
Voice privacy in GSM cellular telephone protocol is provided by _______.
- b5/8 cipher
- b5/6 cipher
- b5/4 cipher
- A5/2 cipher
Solutions
Answer- D
Question - 15
In cryptography, the order of the letters in a message is rearranged by __________.
- transpositional ciphers
- substitution ciphers
- both transpositional ciphers and substitution ciphers
- quadratic ciphers
Solutions
Answer- A
Question - 16
- permutation and substitution on 64 bit blocks of plain text
- only permutations on blocks of 128 bits
- exclusive ORing key bits with 64 bit blocks
- 4 rounds of substitution on 64 bit blocks with 56 bit keys
Solutions
Answer- A
Question - 17
The public key system is useful because-
- it uses two keys
- there is no key distribution problem as public key can be kept in a commonly accessible database
- private key can be kept secret
- it is a symmetric key system
Solutions
Answer- B
Question - 18
- Electronic Control Book
- Electronic Code Book
- Electronic Cipher Book
- Electronic Cryptography Book
Solutions
Answer- B
Question - 19
The cipher which uses the exclusive-or operation as defined in computer science is called:
- Caesar cipher
- XOR cipher
- cipher
- cipher text
Solutions
Answer- B
Question - 20
- Rivest, Shamir, and Adleman
- Roger, Shamir, and Adrian
- Robert, Shamir, and Anthoney
- Rivest, Shaw, and Adleman
Solutions
Answer- A
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