MACs are also called

CRYPTOGRAPHY AND NETWORK SECURITY - MESSAGE AUTHENTICATION CODES AND KEY MANAGEMENT MCQ

• Which figure implements confidentiality and authentication?
• Which figure implements confidentiality, authentication and signature?
• The below figure implements authentication and signature only?
• The below figure represents internal error control
• The following figure has authentication tied to the plain text-
• What does the following figure represent?
• What does the below figure represent?
• Another name for Message authentication codes is
• For a 150-bit message and a 10-bit MAC, how many values are the MAC value dependent on?
• Confidentiality can only be provided if we perform message encryption before the MAC generation
• MACs are also called
• For a 100 bit key and a 32 bit tag, how many possible keys can be produced in the 3rd round?
• MAC is a
• For an n-bit tag and a k-bit key, the level of effort required for brute force attack on a MAC algorithm is
• Cryptographic hash functions execute faster in software than block ciphers
• What is the value of ipad in the HMAC structure?
• What is the value of opad in the HMAC structure?
• Which cryptographic algorithm is used in CMAC?
• In CMAC, which scenario is a different key K2 is used instead of K1?
• Which Authentication Encryption approach is taken by the SSL/TLS protocol?
• Which Authentication Encryption approach is taken by the IPSec protocol?
• Which Authentication Encryption approach is taken by the SSH protocol?
• Hashing followed by encryption (H→E) is used by which algorithm?
• Which of the following terms is not an input to the CCM encryption?
• How many passes through the plaintext does the CCM require to generate the MAC value?
• In GCM, we define S as S = GHASH(A||0^v||C||0^u||[len(A)]||[len(C)]). What is v defined as?
• When the length of the IV is not 96, then
• Which is not true for Key-Wrapping?
• What is the value of A (0)?
• The key Wrapping Algorithm provides confidentiality and data integrity
• Which of the following is not true for whirlpool hashing function?
• The expected workload of generating a collision is of the order of ____________ executions of Whirlpool
• Given a message, the expected workload of finding a message that hashes to that value is of the order ____________
• Given a message and its n-bit hash result, the expected workload of finding a message that hashes to the same value is of the order _______________
• The message is padded to
• The length of the message is appended to the message. What is the size of this length?
• The hash matrix is of the size
• The 8 × 8 hash matrix holds values of size
• The hash matrix of 8 × 8 is preferred over a 16 × 4 matrix because
• How many rounds are there in one Whirlpool Iteration?
• Which one of these is not a Whirlpool function?
• What is the correct order of operation within each round of the Whirlpool algorithm?
• What is the size of the s-box table/matrix in Whirlpool?
• The S-box implements linear mapping thus providing diffusion
• Another name for the Whirlpool key is
• How many round constants (RCs) are required in Whirlpool?
• The Round Constant is dependent on the s-box values
• The Round Constant is given by S[8(r-1)+j]. What are the limits of ‘r’?
• When the Round Constant is given by S[8(r-1)+j]. What are the limits of ‘i’ and ‘j’?
• The 7th row in the 8 × 8 matrix undergoes a ___________ shift
• How many XOR gate operations are involved in the S-box permutation?
• Which round provides linear diffusion in the Whirlpool Algorithm?
• Mix Row functions operate on the 8 × 8 matrix (A) to form the new matrix. The operation can be considered to be B = AC. The matrix C is formed by
• Which of the following hexadecimal values are not present in the matrix C of the Mix Rows function?
• There’s no known successful attacks made against Whirlpool
• Which hash algorithm is the most hardware intensive among the following?
• Which algorithm has the most execution latency?
• Which among the following has not been broken yet( still collision free)?
• Before the first round of the Whirlpool algorithm, which is the operation that takes place?
• How many rounds does the Whirlpool algorithm undergo?
• Each round uses a different key in the algorithm
• What is the size of the key in the algorithm?
• How many add round key functions are present in the Whirlpool algorithm?
• If end to end connection is done at a network or IP level, and if there are N hosts, then what is the number of keys required?
• For 1000 nodes in IP level, how many keys would be required?
• Communication between end systems is encrypted using a key, often known as
• Session keys are transmitted after being encrypted by
• For a network with N nodes, how many master keys are present?
• PDU stands for
• SSM stands for
• Which is the last step in establishing a connection between hosts using the SSM?
• Larger networks would prefer a full decentralization
• Which of these is not a type of session key?
• Which session key is used for electronic funds transfer and point of sale applications?
• Sometimes a simple tag is introduced along with the session key. This tag has 8 bits. Which of the following options is wrong?
• Hash Value = H = h(CV) Key Input = Km XOR H Ciphertext = E([Km XOR H],Ks) What is CV here?
• Which is the correct representation for session key recovery for the plain text?
• Which of the following is required to find the session key?
• “Meet in the middle attack” and “man in the middle attack” are the same
• “Meet in the middle attack” is an attack
• Public key encryption/decryption is not preferred because
• Which one of the following is not a public key distribution means?
• What is the PGP stand for?
• PGP makes use of which cryptographic algorithm?
• USENET is related to which of the following Public Key distribution schemes?
• Which of the following public key distribution systems is most secure?
• Which systems use a timestamp?
• Which of these systems use timestamps as an expiration date?
• Which system uses a trusted third party interface?
• Publicly Available directory is more secure than which other system?
• Extensions were added in which version?
• The subject unique identifier of the X.509 certificates was added in which version?
• Which of the following is not an element/field of the X.509 certificates?
• Suppose that A has obtained a certificate from certification authority X1 and B has obtained certificate authority from CA X2. A can use a chain of certificates to obtain B’s public key. In notation of X.509, this chain is represented in the correct order as –
• Certificates generated by X that are the certificates of other CAs are Reverse Certificates
• It is desirable to revoke a certificate before it expires because
• CRL stands for
• Which of the following is not a part of an Extension?
• The criticality indicator indicates whether an extension can be safely ignored
• “Conveys any desired X.500 directory attribute values for the subject of this certificate
• How many handshake rounds are required in the Public-Key Distribution Scenario?
• A total of seven messages are required in the Public-Key distribution scenario. However, the initial five messages need to be used only infrequently because both A and B can save the other’s public key for future – a technique known as ____
• X.509 certificate recommends which cryptographic algorithm?
• The issuer unique identifier of the X.509 certificates was added in which version?
• The period of validity consists of the date on which the certificate expires
• Certificate extensions fall into 3 categories. Which one of the following is not a Certificate extensions category?
• How many functions are involved in the PKIX architectural model?
• CMP stands for
• CMS stands for

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