What is EEA ?
In the field of cybersecurity, particularly within the domain of classical cryptography fundamentals and the introduction to public-key cryptography, the term "EEA" refers to the Extended Euclidean Algorithm. This algorithm is a vital tool in number theory and cryptographic applications, especially in the context of public-key cryptography systems such as RSA (Rivest-Shamir-Adleman). The Euclidean Algorithm
- Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, Introduction to public-key cryptography, Number theory for PKC – Euclidean Algorithm, Euler’s Phi Function and Euler’s Theorem
Are brute force attack always an exhausive key search?
A brute-force attack in the context of cybersecurity and classical cryptography is a method used to decrypt data by systematically trying all possible keys until the correct one is found. It is often associated with an exhaustive key search, which implies attempting every potential key in the keyspace until the correct one is identified. The
In RSA cipher, does Alice need Bob’s public key to encrypt a message to Bob?
In the context of the RSA cryptosystem, Alice indeed requires Bob's public key to encrypt a message intended for Bob. The RSA algorithm is a form of public-key cryptography, which relies on a pair of keys: a public key and a private key. The public key is used for encryption, while the private key is
Can we use a block cipher to build a hash function or MAC?
Certainly, the use of block ciphers to construct hash functions and Message Authentication Codes (MACs) is a well-established practice in the field of cryptography. A block cipher is a symmetric key cipher that operates on fixed-size blocks of data using a shared secret key. Examples of block ciphers include the Advanced Encryption Standard (AES) and
What are initialization vectors?
Initialization Vectors (IVs) are a fundamental concept in the field of cryptography, particularly in the context of stream ciphers, random numbers, and the one-time pad. They play a important role in ensuring the security and integrity of encrypted data. This detailed explanation will consider the nature, purpose, and application of IVs, providing a comprehensive understanding
- Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, Stream ciphers, Stream ciphers, random numbers and the one-time pad
How many part does a public and private key has in RSA cipher
The RSA cryptosystem, named after its inventors Rivest, Shamir, and Adleman, is one of the most well-known public-key cryptographic systems. It is widely used for secure data transmission. RSA is based on the mathematical properties of large prime numbers and the computational difficulty of factoring the product of two large prime numbers. The system relies
- Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, Introduction to public-key cryptography, The RSA cryptosystem and efficient exponentiation
Can OFB mode be used as keystream generators?
Output Feedback (OFB) mode is one of the several modes of operation for block ciphers, which allows a block cipher to be used in a way that provides confidentiality by converting it into a stream cipher. This mode is particularly notable for its ability to generate keystreams, making it a suitable candidate for certain cryptographic
Can single bit of ciphertext be influenced by many bit of plaintext in DES?
The Data Encryption Standard (DES) is a symmetric-key algorithm for the encryption of digital data. Developed in the early 1970s and adopted as a federal standard in 1977, DES has been widely used in various applications. One of the critical aspects of DES and other block ciphers is how plaintext bits influence the resulting ciphertext.
Are 7 and 12 equivalent in mode 5 operation
In the context of modular arithmetic, which is a fundamental concept in classical cryptography, the question of whether the numbers 7 and 12 are equivalent in mode 5 operation can be addressed by examining their equivalence under modulo 5. Modular arithmetic is a system of arithmetic for integers, where numbers "wrap around" upon reaching a
What is cryptanalysis?
Cryptanalysis is the study and practice of analyzing information systems to understand hidden aspects of the systems. In the realm of cybersecurity, cryptanalysis specifically refers to the process of deciphering encrypted data without knowledge of the key used in the encryption process. This field is a important aspect of cryptography, which is the broader science