Which of the following is not a channelization protocol?

• A. Frequency division multiple access
• B. Time division multiple access
• C. Code division multiple access
• D. Bandwidth division multiple access

What technique is used by the TDMA to accomplish synchronization?

• A. Preamble bits
• B. Synchronization bytes
• C. Guard bits
• D. Start points

Which of the following is not an alternative name for symmetric key cryptography?

• A. Secret key cryptography
• B. Public key cryptography
• C. Conventional encryption
• D. Private key cryptography

What is the cipher text for the text “GREET HER”, if Caesar Cipher is used(key=3)?

• A. Kviiy liv
• B. Kviix liv
• C. Lwjjy mjw
• D. Juhhw khu

What is the cipher text for the message “TAKE ME TO THE PARTY”, id Rail Fence technique is used with two rows?

• A. Tkmtteataeeohpry
• B. Takemetotheparty
• C. Taekmeotthpearyt
• D. Yrphoeeataettmkt

What are the two broad categories of symmetric key cryptography?

• A. Transposition and substitution
• B. Classical and modern
• C. Stream and block
• D. Classical and block

Which of the following algorithm does not belong to symmetric key ciphers?

• A. Des
• B. Rc4
• C. Aes
• D. Diffie-hellman

Which of the following is an advantage of symmetric cipher?

• A. (n(n-1))/2 keys are required for n people
• B. Sharing secret key over communication channel
• C. Brute force attack for small key size
• D. Quick encryption and decryption

Which of the following is incorrect about symmetric key cryptography?

• A. It uses common key for both encryption and decryption
• B. It is a secret key cryptography
• C. It uses single fixed length key for each algorithm
• D. Symmetric key can be combined with asymmetric key to achieve more security

Which of the following is a disadvantage of symmetric cipher?

• A. Quick encryption
• B. Less computational power
• C. High level of security
• D. Transmission of secret key