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CSC602 Cryptography & System Security MCQs.
Save The assurance that a given entity is involved and currently active in a communication session is called as ________ a. Message authentication b. Entity Authentication c. Authentication d. All of the above - ANSWERb. Entity Authentication The Application Layer includes which protocol. a. ICMP b. UDP c. SMTP d. ARP - ANSWERc. SMTP How many algorithms does digital signature consist of? a. 2 b. 3 c. 4 d. 5 - ANSWERb. 3 A cryptographic hash function is an equation used to verify the ____ of data. a. variety
b. validity c. veracity d. None of the above - ANSWERb. validity The DES Algorithm Cipher System consists of ____________rounds (iterations) each with a round key. a. 12 b. 18 c. 9 d. 16 - ANSWERd. 16 The method of converting plaintext into cipher text by using an algorithm and a key is called as ________ a. Eavesdropping b. Encryption c. Decryption d. Cryptography - ANSWERb. Encryption The _________ cipher is a symmetric-key based encryption technique that uses digraph Substitution cipher. a. Playfair b. Hill c. Vigenère d. Keyed - ANSWERa. Playfair
b. transport layer c. application layer d. network layer - ANSWERa. session layer Which one is the strong attack mechanism? a. chosen plaintext attack b. chosen cipher text c. brute force attack d. man in the middle attack - ANSWERc. brute force attack Which layer filters the proxy firewall? a. application b. network c. transport d. none of the above - ANSWERa. application GCD(a,b) = GCD(b,a mod b) a. true b. false c. cannot be determined d. none - ANSWERa. true Does the set of residue classes (mod 3) form a group with respect to modular addition? a. yes
b. no c. can't say d. insufficient data - ANSWERa. yes Public key encryption is advantageous over Symmetric key Cryptography because of _______ a. speed b. space c. key exchange d. key length - ANSWERc. key exchange Rail Fence Technique is an example of a. substitution b. transposition c. product cipher d. Caesar cipher - ANSWERb. transposition Which one of the following can be considered as the class of computer threats? a. DoS attack b. Phishing c. Soliciting d. Both A and C - ANSWERa. DoS attack Which of the following is considered as the unsolicited commercial email?
The field that covers a variety of computer networks, both public and private, that are used in everyday jobs. a. Artificial Intelligence b. ML c. Network Security d. IT - ANSWERc. Network Security Which of these is a part of network identification? a. User ID b. Password c. OTP d. fingerprint - ANSWERa. User ID Secure Hash Algorithm - 1 (SHA-1) has a message digest of a. 160 bits b. 512 bits c. 628 bits d. 820 bits - ANSWERa. 160 bits A hash function guarantees the integrity of a message. It guarantees that the message has not been_____ a. replaced b. over view c. changed d. violated - ANSWERc. changed
A Digital Signature is required: a. for non repudiation of communication by a sender b. for all email sending c. for all DHCP Server d. for FTP transactions - ANSWERa. for non repudiation of communication by a sender _________ uses pretty good privacy (PGP) algorithm. a. Electronic Mails b. File encryption c. Both Electronic Mails and File Encryption d. None of the above - ANSWERc. Both Electronic Mails and File Encryption What is the gcd value of the pair (88 and 220) using Euclid algorithm. a. 22 b. 44 c. 11 d. 88 - ANSWERb. 44 What is the ciphertext after encrypting the plaintext "secure" with key value = 15 by using additive cipher technique. a. htrgjt b. hsrgjs c. hsrjgs
b. RSA c. MD d. RC5 - ANSWERa. AES The number of rounds in RC5 can range from 0 to _ a. 127 b. 63 c. 31 d. 255 - ANSWERd. 255 How many rounds does the AES-192 perform? a. 10 b. 14 c. 16 d. 12 - ANSWERd. 12 For the Knapsack: {1 6 8 15 24}, Find the cipher text value for the plain text
a. 40 b. 15 c. 14 d. 39 - ANSWERa. 40 Which of the following is not possible through hash value? a. Password check
b. Data integrity check c. Data retrieval d. Digital signature - ANSWERc. Data retrieval Which of the following is not an element/field of the X.509 certificates? a. Issuer Name b. Serial Modifier c. Issue unique identifier d. Signature - ANSWERb. Serial Modifier _______ is responsible for distributing keys to pairs of users (hosts, processes, applications) as needed a. Key distribution center b. Key analysis center c. UKey storing center d. HKey storing center - ANSWERa. Key distribution center A digital certificate system... a. uses third-party CAs to validate a user's identity b. uses digital signatures to validate a user's identity c. uses tokens to validate a user's identity d. are used primarily by individuals for personal correspondence - ANSWERa. uses third-party CAs to validate a user's identity Hashed message is signed by a sender using
What is honey pot attack? a. dummy device put into the network to attract attackers b. single line threat c. Ip spoofing bypass d. recognition attack - ANSWERa. dummy device put into the network to attract attackers Which of the following tool would NOT be useful in figuring out what spyware or viruses could be installed on a client's computer? a. Wireshark b. Malware Bytes c. HighjackThis d. HitmanPro - ANSWERa. Wireshark Which of the following does authorization aim to accomplish? a. Restrict what operations/data the user can access b. Determine if the user is an attacker c. Flag the user if he/she misbehaves d. Determine who the user is - ANSWERd. Determine who the user is A person who enjoys learning details about computers and how to enhance their capabilities. a. cracker b. hacker c. app controller
d. site controller - ANSWERb. hacker Choose from among the following cipher systems, from best to the worst, with respect to ease of decryption using frequency analysis. a. random polyalphabetic, plaintext, playfair b. random polyalphabetic, playfair, vignere c. random polyalphabetic, vignere, playfair, plaintext d. random polyalphabetic, plaintext, beaufort, playfair - ANSWERc. random polyalphabetic, vignere, playfair, plaintext The process of writing the text as rows and read it as columns is known as a. vernam cipher b. ceaser cipher c. transposition columnar cipher d. homophonic substitution cipher - ANSWERc. transposition columnar cipher What is the port number for HTTPS (HTTP Secure)? a. 43 b. 443 c. 445 d. 444 - ANSWERb. 443 The certificate message is required for any agreed key exchange method, except _________. a. Ephemeral Diffie-Hellman
