Cryptography Fundamentals: Ciphers, Encryption, and Hashing Techniques,
Exams of Science education
Which of the following refers to the study of breaking cryptographic systems?
a) Cryptology.
b) Cryptography.
c) Cryptanalyisis.
d) Cryptosystems. - ANSWERCryptanalyisis.
Which of the following branches of cryptography applies cryptographic
algorithms to establish secure communications?
a) Symmetric algorithms.
b) Asymmetric algorithms.
,c) Cryptographic protocols.
d) None of the above. - ANSWERCryptographic protocols
Which of the following branches of cryptography involves encryption and
decryption using a single secret key?
a) Symmetric algorithms.
b) Asymmetric algorithms.
c) Cryptographic protocols.
d) None of the above. - ANSWERSymmetric algorithms
Which of the following is NOT a requirement of good symmetric
cryptography?
a) A secure channel to get the key to both participants of a communication.
b) A large enough keyspace to prevent attackers from easily guessing the key.
c) An algorithm that is only known to the participants of the communication.
,d) Publicly known and thoroughly tested encryption and decryption
algorithms - ANSWERAn algorithm that is only known to the participants of
the communication.
What is the best technique for breaking a substitution cipher?
a) A brute force attack.
b) A statistical approach using frequency analysis.
c) An implementation attack.
d) A social engineering attack. - ANSWERA statistical approach using
frequency analysis.
Which type of attack involves tricking or coercing human beings with access
to secret keys to reveal them?
a) A brute-force attack.
b) An analytical attack.
c) An implementation attack.
d) A social engineering attack. - ANSWERA social engineering attack.
, What is the best defense against a brute-force attack on a cipher?
a) Using an asymmetric algorithm instead of a symmetric algorithm.
b) Using a proprietary encryption algorithm.
c) Using a key length of 256 bits for a symmetric cipher, or the equivalent for
an asymmetric cipher.
d) Encrypting the message twice with the same key. - ANSWERUsing a key
length of 256 bits for a symmetric cipher, or the equivalent for an asymmetric
cipher.
Which of the following is not true about modular arithmetic given integers a
and m > 0?
a) There are multiple values for r between 0 and m - 1 such that
a ≡ r mod m
b) In general, there are infinitely many possible values of r that satisfy
a ≡ r mod m
c) The set of all values of r that satisfy
a ≡ r mod m form an equivalence class.
Exams of Science education
Which of the following refers to the study of breaking cryptographic systems?
a) Cryptology.
b) Cryptography.
c) Cryptanalyisis.
d) Cryptosystems. - ANSWERCryptanalyisis.
Which of the following branches of cryptography applies cryptographic
algorithms to establish secure communications?
a) Symmetric algorithms.
b) Asymmetric algorithms.
,c) Cryptographic protocols.
d) None of the above. - ANSWERCryptographic protocols
Which of the following branches of cryptography involves encryption and
decryption using a single secret key?
a) Symmetric algorithms.
b) Asymmetric algorithms.
c) Cryptographic protocols.
d) None of the above. - ANSWERSymmetric algorithms
Which of the following is NOT a requirement of good symmetric
cryptography?
a) A secure channel to get the key to both participants of a communication.
b) A large enough keyspace to prevent attackers from easily guessing the key.
c) An algorithm that is only known to the participants of the communication.
,d) Publicly known and thoroughly tested encryption and decryption
algorithms - ANSWERAn algorithm that is only known to the participants of
the communication.
What is the best technique for breaking a substitution cipher?
a) A brute force attack.
b) A statistical approach using frequency analysis.
c) An implementation attack.
d) A social engineering attack. - ANSWERA statistical approach using
frequency analysis.
Which type of attack involves tricking or coercing human beings with access
to secret keys to reveal them?
a) A brute-force attack.
b) An analytical attack.
c) An implementation attack.
d) A social engineering attack. - ANSWERA social engineering attack.
, What is the best defense against a brute-force attack on a cipher?
a) Using an asymmetric algorithm instead of a symmetric algorithm.
b) Using a proprietary encryption algorithm.
c) Using a key length of 256 bits for a symmetric cipher, or the equivalent for
an asymmetric cipher.
d) Encrypting the message twice with the same key. - ANSWERUsing a key
length of 256 bits for a symmetric cipher, or the equivalent for an asymmetric
cipher.
Which of the following is not true about modular arithmetic given integers a
and m > 0?
a) There are multiple values for r between 0 and m - 1 such that
a ≡ r mod m
b) In general, there are infinitely many possible values of r that satisfy
a ≡ r mod m
c) The set of all values of r that satisfy
a ≡ r mod m form an equivalence class.
