Which of the following cipher is truly unconditionally secure? O a. One Time Pad O b. Caesar Cipher O c. Vigenere Cipher O d. Play Fair Cipher What is the value of 'L' in cycle 5 of DES cipher? O a. L5=R5 O b. L4=R3 O c. L4=R4 O d. L5=R3 PKC's can be used to achieve O a. Confidentiality O b. Redundancy O c. Both confidentiality and Authentication O d. Authentication Which of the following mechanism inserts bits into gaps in a data stream? O a. Traffic analysis O b. Zero bit O c. Cipher text O d. Traffic padding Which of the following mechanism enables selection of a route for secure data? a. Routing access O b. Traffic padding O c. Routing control O d. Traffic analysis Identify the method that performs various permutations on the plaintext to get the cipher text. O a. Playfair O b. Onetime Pad O c. Caesar Cipher O d.Columnar The expression to evaluate private key in RSA is basically derived from O a. Congruence formula O b. Number Theory C. Totient function O d. Probability Theory Which of the following cipher can be termed as a shift cipher? O a. Vigenere Cipher O b. Play Fair Cipher O c. One Time Pad O d. Caesar Cipher Which of the following is emphasized in a passive attack? O a. Transposition O b. Prevention c. Detection O d. Key Distribution In an asymmetric key cryptography, the private key is with O a. Key Register O b. Receiver C. Sender O d. All devices in network