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Computer Networks » Cryptography

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In cryptography, what is cipher?

A. Algorithm for performing encryption and decryption
B. Encrypted message
C. Both algorithm for performing encryption and decryption and encrypted message
D. Decrypted message

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In asymmetric key cryptography, the private key is kept by __________

A. Sender
B. Receiver
C. Sender and receiver
D. All the connected devices to the network

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Which one of the following algorithm is not used in asymmetric-key cryptography?

A. Rsa algorithm
B. Diffie-hellman algorithm
C. Electronic code book algorithm
D. Dsa algorithm

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In cryptography, the order of the letters in a message is rearranged by __________

A. Transpositional ciphers
B. Substitution ciphers
C. Both transpositional ciphers and substitution ciphers
D. Quadratic ciphers

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What is data encryption standard (DES)?

A. Block cipher
B. Stream cipher
C. Bit cipher
D. Byte cipher

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Cryptanalysis is used __________

A. To find some insecurity in a cryptographic scheme
B. To increase the speed
C. To encrypt the data
D. To make new ciphers

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Which one of the following is a cryptographic protocol used to secure HTTP connection?

A. Stream control transmission protocol (sctp)
B. Transport layer security (tls)
C. Explicit congestion notification (ecn)
D. Resource reservation protocol

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Voice privacy in GSM cellular telephone protocol is provided by _______

A. A5/2 cipher
B. B5/4 cipher
C. B5/6 cipher
D. B5/8 cipher

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ElGamal encryption system is __________

A. Symmetric key encryption algorithm
B. Asymmetric key encryption algorithm
C. Not an encryption algorithm
D. Block cipher method

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Cryptographic hash function takes an arbitrary block of data and returns _________

A. Fixed size bit string
B. Variable size bit string
C. Both fixed size bit string and variable size bit string
D. Variable sized byte string

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