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WorksheetsCRYPTOGRAPHY
Total questions: 10
Worksheet time: 5mins
In cryptography, what is cipher?
algorithm for performing encryption and decryption
encrypted message
both algorithm for performing encryption and decryption and encrypted message
decrypted message
In asymmetric key cryptography, the private key is kept by __________
sender
receiver
sender and receiver
all the connected devices to the network
Which one of the following algorithm is not used in asymmetric-key cryptography?
rsa algorithm
diffie-hellman algorithm
electronic code book algorithm
dsa algorithm
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
What is data encryption standard (DES)?
block cipher
stream cipher
bit cipher
byte cipher
Cryptanalysis is used __________
to find some insecurity in a cryptographic scheme
to increase the speed
to encrypt the data
to make new ciphers
Which one of the following is a cryptographic protocol used to secure HTTP connection?
stream control transmission protocol (SCTP)
transport layer security (TLS)
explicit congestion notification (ECN)
resource reservation protocol
What is the Diffie-Hellman key exchange vulnerable to?
Snooping
Man-in-the-middle attacks
ROBOT attacks
Phishing attacks
What is the name of the encryption/decryption key known only to the party or parties that exchange secret messages?
E-signature
Digital certificate
Private key
Security token
What is the size of round key for DES algorithm?
32 BITS
64 BITS
48 BITS
36 BITS
