CRYPTOGRAPHY

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