Cryptographic Tools (Computer Security: Principles and Practice
T - Answer- Symmetric encryption is used primarily to provide confidentiality.
T - Answer- Two of the most important applications of public-key encryption are digital signatures and key management.
F - Answer- Cryptanalytic at...
Cryptographic Tools (Computer
Security: Principles and Practice
T - Answer- Symmetric encryption is used primarily to provide confidentiality.
T - Answer- Two of the most important applications of public-key encryption are
digital signatures and key management.
F - Answer- Cryptanalytic attacks try every possible key on a piece of ciphertext until
an intelligible translation into plaintext is obtained.
T - Answer- The secret key is input to the encryption algorithm.
F - Answer- Triple DES takes a plaintext block of 64 bits and a key of 56 bits to
produce a ciphertext block of 64 bits.
T - Answer- Modes of operation are the alternative techniques that have been
developed to increase the security of symmetric block encryption for large
sequences of data
F - Answer- The advantage of a stream cipher is that you can reuse keys.
T - Answer- A message authentication code is a small block of data generated by a
secret key and appended to a message.
F - Answer- Like the MAC, a hash function also takes a secret key as input.
T - Answer- The strength of a hash function against brute-force attacks depends
solely on the length of the hash code produced by the algorithm.
T - Answer- Public-key cryptography is asymmetric.
F - Answer- Public-key algorithms are based on simple operations on bit patterns.
F - Answer- The purpose of the DSS algorithm is to enable two users to securely
reach agreement about a shared secret that can be used as a secret key for
subsequent symmetric encryption of messages.
T - Answer- An important element in many computer security services and
applications is the use of cryptographic algorithms.
T - Answer- Some form of protocol is needed for public-key distribution.
D - Answer- The original message or data that is fed into the algorithm is
__________.
A. encryption algorithm B. secret key
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