Can an encrytion be deterministic?
Encryption, in the realm of cybersecurity, can indeed be deterministic, although the desirability and application of such deterministic encryption depend on the specific use case and security requirements. To understand the nuances of deterministic encryption, it is essential to consider the principles of classical cryptography, particularly the modes of operation for block ciphers. Block ciphers
- Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, Applications of block ciphers, Modes of operation for block ciphers
Between linear and differential cryptanalysis which is efficient for breaking DES?
The Data Encryption Standard (DES) is a symmetric-key algorithm for the encryption of digital data. Developed in the 1970s, DES became a widely adopted encryption standard. However, with the advancement of computational power and cryptanalytic techniques, DES has been subject to various forms of cryptanalysis, among which linear and differential cryptanalysis are particularly notable. Linear
- Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, DES block cipher cryptosystem, Data Encryption Standard (DES) - Key schedule and decryption
What is the CSPRNG unpredictability based on?
Cryptographically Secure Pseudo-Random Number Generators (CSPRNGs) are fundamental components in the realm of cybersecurity, particularly in the context of classical cryptography and stream ciphers. The unpredictability of CSPRNGs is a critical attribute that ensures the security of cryptographic systems. This property is based on several key factors, including the initial seed value, the deterministic algorithm
- Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, Stream ciphers, Stream ciphers, random numbers and the one-time pad
How does a stream cipher differ from a block cipher in terms of data encryption?
Stream ciphers and block ciphers are two fundamental types of symmetric key encryption methods used in the field of cryptography to secure data. Both have distinct operational mechanisms and use cases, making them suitable for different scenarios. A stream cipher encrypts plaintext one bit or byte at a time, typically by combining it with a
How does the Counter (CTR) mode of operation allow for parallel encryption and decryption, and what advantages does this provide in practical applications?
The Counter (CTR) mode of operation is a widely utilized technique in the realm of block cipher encryption, known for its efficiency and versatility. Unlike other modes of operation, such as Cipher Block Chaining (CBC) or Electronic Codebook (ECB), CTR mode exhibits unique characteristics that make it particularly suitable for parallel processing during both encryption
What are the main differences between deterministic and probabilistic modes of operation for block ciphers, and why is this distinction important?
Block ciphers are a fundamental component of modern cryptographic systems, providing a mechanism to encrypt fixed-size blocks of data. However, to securely encrypt messages of arbitrary length, block ciphers must be used in conjunction with a mode of operation. Modes of operation define how block ciphers can be applied to data sequences that exceed the
- Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, Applications of block ciphers, Modes of operation for block ciphers, Examination review
What are block ciphers and how do they differ from stream ciphers in terms of data encryption?
Block ciphers and stream ciphers are fundamental concepts in the field of cryptography, specifically under the branch of symmetric key encryption. Both are employed to secure data, but they operate in fundamentally different ways, each with its own set of advantages and disadvantages. Understanding these differences is important for selecting the appropriate encryption method for
- Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, Applications of block ciphers, Modes of operation for block ciphers, Examination review
What are the primary differences between stream ciphers and block ciphers in symmetric cryptography?
In the realm of symmetric cryptography, two primary types of ciphers are employed to ensure data confidentiality: stream ciphers and block ciphers. Both types of ciphers utilize the same key for both encryption and decryption processes, yet they operate in fundamentally different ways, each with its own set of advantages, disadvantages, and appropriate use cases.
- Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, Stream ciphers, Stream ciphers, random numbers and the one-time pad, Examination review
Why a block cipher can be easily turned into a stream cipher while the opposite is not the case?
A block cipher can be indeed easily turned into a stream cipher while the opposite is not the case. This is due to the fundamental differences between block ciphers and stream ciphers, as well as the properties and requirements of each. To better understand this problem, let's first define what block ciphers and stream ciphers