Tech 3498 Ch 21
chosen ciphertext
A __________ type of attack exploits properties of the RSA algorithm. Group of answer choices timing brute-force chosen ciphertext
True
A hash function such as SHA-1 was not designed for use as a MAC and cannot be used directly for that purpose because it does not rely on a secret key. Group of answer choices True False
timing
Although the _________ attack is a serious threat, there are simple countermeasures that can be used such as constant time calcs, random delays or blinding computations. Group of answer choices timing chosen ciphertext mathematical none of the above
True
Cryptographic hash functions generally execute faster in software than conventional encryption algorithms such as DES. Group of answer choices True False
SHA-1
In 2005, NIST announced the intention to phase out approval of _______ and move to a reliance on the other SHA versions by 2010. Group of answer choices SHA-1 SHA-512 SHA-256 SHA-2
True
SHA-2 shares the same structure and mathematical operations as its predecessors and this is a cause for concern. Group of answer choices True False
SHA-1
The DSS makes use of the _________ and presents a new digital signature technique, the Digital Signature Algorithm (DSA). Group of answer choices HMAC XOR RSA SHA-1
True
The Diffie-Hellman algorithm depends for its effectiveness on the difficulty of computing discrete logarithms. Group of answer choices True False
DSS
The National Institute of Standards and Technology has published Federal Information Processing Standard FIPS PUB 186, known as the __________. Group of answer choices XOR MD5 MAC DSS
timing
The _________ attack exploits the common use of a modular exponentiation algorithm in RSA encryption and decryption, but can be adapted to work with any implementation that does not run in fixed time. Group of answer choices mathematical timing chosen ciphertext brute-force
RSA
The _________ scheme has reigned supreme as the most widely accepted and implemented approach to public-key encryption. Group of answer choices SHA-1 HMAC MD5 RSA
DSS
The __________ uses an algorithm that is designed to provide only the digital signature function and cannot be used for encryption or key exchange. Group of answer choices ECC RSA DSS XOR
True
The appeal of HMAC is that its designers have been able to prove an exact relationship between the strength of the embedded hash function and the strength of HMAC. Group of answer choices True False
True
The key exchange protocol is vulnerable to a man-in-the-middle attack because it does not authenticate the participants. Group of answer choices True
True
The one-way hash function is important not only in message authentication but also in digital signatures. Group of answer choices True False
False
The operations performed during a round consist of circular shifts, and primitive Boolean functions based on DSS, MD5, SHA, and RSA. Group of answer choices True False
ECC
The principal attraction of __________ compared to RSA is that it appears to offer equal security for a far smaller bit size, thereby reducing processing overhead. Group of answer choices ECC MD5 Diffie-Hellman none of the above
False
Timing attacks are only applicable to RSA. Group of answer choices True False
True
Unlike RSA, DSS cannot be used for encryption or key exchange. Group of answer choices True False
Timing attacks
_________ are analogous to a burglar guessing a safe combination by observing how long it takes to turn the dial from number to number. Group of answer choices Digital standards Mathematical attacks Ciphers Timing attacks
Mathematical
_________ attacks have several approaches, all equivalent in effort to factoring the product of two primes. Group of answer choices Mathematical Brute-force Chosen ciphertext
Diffie-Hellman
___________ was the first published public-key algorithm. Group of answer choices NIST Diffie-Hellman RC4 RSA
brute-force
A ________ attack involves trying all possible private keys. Group of answer choices mathematical timing brute-force chosen ciphertext
True
HMAC can be proven secure provided that the embedded hash function has some reasonable cryptographic strengths. Group of answer choices True False
HMAC
Issued as RFC 2104, __________ has been chosen as the mandatory-to-implement MAC for IP Security. Group of answer choices RSA SHA-3 DSS
True
RSA is a block cipher in which the plaintext and ciphertext are integers between 0 and n ? 1 for some n. Group of answer choices True False
True
SHA is perhaps the most widely used family of hash functions. Group of answer choices True False
False
SHA-1 is considered to be very secure. Group of answer choices True False
160
SHA-1 produces a hash value of __________ bits. Group of answer choices 256 160 384 180
True
SHA-3 algorithms must be designed to resist any potentially successful attack on SHA-2 functions. Group of answer choices True False
