Cryptographic Tools, Computer Security Principles and Practice Questions & Answers
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Cryptographic Tools, Computer Security Principles
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Cryptographic Tools, Computer Security Principles
Cryptographic Tools, Computer Security Principles and Practice
Asymmetric encryption - Answer- Type of algorithm used in public key encryption, relies on one key for encryption and a different but related key for decryption.
Advanced Encryption Standard (AES) - Answer- A symmetric block ciphe...
Cryptographic Tools, Computer
Security Principles and Practice
Asymmetric encryption - Answer- Type of algorithm used in public key encryption,
relies on one key for encryption and a different but related key for decryption.
Advanced Encryption Standard (AES) - Answer- A symmetric block cipher with a
block length of 128 bits and supports key lengths 128, 192, and 256 bits. Its security
strength is equal to or better than 3DES and its effinciency is significantly improved.
It was standerdized by NIST and published in FIPS 197. (Rijndael algorithm)
Authentication - Answer- Verifying where information originates from and wheter it is
changed only in a specified and authorized manner. (Data integrity)
Brute-force attack - Answer- An attack on an encryption scheme that tries every
possible key on a piece of ciphertext until an intelligible translation into plaintext is
obtained.
Ciphertext - Answer- Data that has been encrypted. The result of encryption
performed on plaintext using an algorithm.
Collision resistant - Answer- Property of a cryptographic hash function where it is
computationally infeasible to find any two distinct inputs that hash to the same
output.
It is computationally infeasible to find any pair (x, y) such that Hash(x) = Hash(y).
Confidentiality - Answer- Assures that transmitted or stored data is not available or
disclosed to unauthorized individuals. Preserving authorized restrictions on access
and disclosure of transmitted or stored data.
Cryptanalysis - Answer- Exploits the characteristics of the algorithm to attempt to
deduce a specific plaintext or to deduce the key being used.
Cryptography - Answer- Information is transformed into an unreadable format, called
cipher text.
The practice and study of techniques for secure communication in the presence of
third parties. It is about constructing and analyzing protocols that prevent third
parties or the public from reading private messages. (Wikipedia)
Data integrity - Answer- Protection against active attack (falsification of data and
transactions) is known as message or data authentication. The two important
aspects are to verify that the contents of the message have not been altered and that
the source is authentic. We may also wish to verify a message´s timeliness and
sequence. All of these concerns come under a particular category as was described
in Chapter 1.
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