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EITCA Academy

EITCA Academy

The European Information Technologies Certification Institute - EITCI ASBL

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EITCI Institute ASBL

Brussels, European Union

Governing European IT Certification (EITC) framework in support of the IT professionalism and Digital Society

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Questions and answers designated by tag: Key Schedule

Can single bit of ciphertext be influenced by many bit of plaintext in DES?

Saturday, 10 August 2024 by Emmanuel Udofia

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.

  • Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, DES block cipher cryptosystem, Data Encryption Standard (DES) - Encryption
Tagged under: Avalanche Effect, Block Cipher, Cryptography, Cybersecurity, Feistel Network, Key Schedule, Permutation, S-boxes, Symmetric-Key Algorithm

How may subkeys does DES cipher use?

Monday, 05 August 2024 by Emmanuel Udofia

The Data Encryption Standard (DES) is a symmetric-key algorithm for the encryption of digital data. Symmetric-key algorithms use the same key for both encryption and decryption, which necessitates secure key management. DES is a block cipher, meaning it encrypts data in fixed-size blocks. Specifically, DES processes data in 64-bit blocks, utilizing a 56-bit key to

  • Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, DES block cipher cryptosystem, Data Encryption Standard (DES) - Encryption
Tagged under: Block Cipher, Cryptography, Cybersecurity, DES, Encryption, Feistel Structure, Key Schedule, Subkeys

How does AES ensure confidentiality and integrity of sensitive information during data transmission and storage?

Thursday, 03 August 2023 by EITCA Academy

The Advanced Encryption Standard (AES) is a widely used block cipher cryptosystem that ensures the confidentiality and integrity of sensitive information during data transmission and storage. AES achieves these goals through its secure design and implementation, which incorporates several key features and techniques. Confidentiality is achieved through AES's use of symmetric encryption, where the same

  • Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, AES block cipher cryptosystem, Advanced Encryption Standard (AES), Examination review
Tagged under: Advanced Encryption Standard, AES, Confidentiality, Cryptographic Attacks, Cryptographic Hash Function, Cybersecurity, Integrity, Key Schedule, MAC, Message Authentication Code, NIST, S-box, Secure Design, Secure Implementation, Substitution-permutation Network, Symmetric Encryption

How did DES serve as a foundation for modern encryption algorithms?

Thursday, 03 August 2023 by EITCA Academy

The Data Encryption Standard (DES) played a pivotal role in the development of modern encryption algorithms. It served as a foundation for various cryptographic techniques and paved the way for stronger and more secure encryption methods. This answer will consider the reasons why DES was significant and how it influenced subsequent encryption algorithms. DES, developed

  • Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, DES block cipher cryptosystem, Data Encryption Standard (DES) - Key schedule and decryption, Examination review
Tagged under: Cryptography, Cybersecurity, Data Encryption Standard, DES, Encryption, Feistel Network, Key Schedule

How does the decryption process in DES differ from the encryption process?

Thursday, 03 August 2023 by EITCA Academy

The Data Encryption Standard (DES) is a symmetric block cipher cryptosystem widely used in cybersecurity. It utilizes a Feistel network structure, which consists of multiple rounds of encryption and decryption. The encryption and decryption processes in DES are similar but with some key differences. During the encryption process, DES takes a plaintext message and a

  • Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, DES block cipher cryptosystem, Data Encryption Standard (DES) - Key schedule and decryption, Examination review
Tagged under: Cryptography, Cybersecurity, DES, Feistel Network, Key Schedule, Symmetric Encryption

What is the purpose of the key schedule in the DES algorithm?

Thursday, 03 August 2023 by EITCA Academy

The purpose of the key schedule in the Data Encryption Standard (DES) algorithm is to generate a set of round keys from the initial key provided by the user. These round keys are then used in the encryption and decryption processes of the DES algorithm. The key schedule is a critical component of DES as

  • Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, DES block cipher cryptosystem, Data Encryption Standard (DES) - Key schedule and decryption, Examination review
Tagged under: Cybersecurity, Data Encryption Standard, Decryption, DES, Encryption, Key Schedule

How does understanding the key schedule and decryption process of DES contribute to the study of classical cryptography and the evolution of encryption algorithms?

Thursday, 03 August 2023 by EITCA Academy

Understanding the key schedule and decryption process of the Data Encryption Standard (DES) is important for the study of classical cryptography and the evolution of encryption algorithms. DES, a symmetric block cipher cryptosystem, was widely used for secure data transmission and storage in the past. By delving into the key schedule and decryption process of

  • Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, DES block cipher cryptosystem, Data Encryption Standard (DES) - Key schedule and decryption, Examination review
Tagged under: Cryptography, Cybersecurity, Decryption, DES, Encryption, Key Schedule

What is the main difference between the use of subkeys in encryption and decryption in DES?

Thursday, 03 August 2023 by EITCA Academy

The Data Encryption Standard (DES) is a symmetric block cipher that operates on 64-bit blocks of plaintext and uses a 56-bit key. It employs a Feistel network structure, which involves multiple rounds of encryption and decryption using subkeys derived from the main encryption key. The use of subkeys in DES is important for both encryption

  • Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, DES block cipher cryptosystem, Data Encryption Standard (DES) - Key schedule and decryption, Examination review
Tagged under: Cryptography, Cybersecurity, DES, Key Schedule, Subkeys, Symmetric Encryption

How does the key schedule in DES generate the subkeys used in each round of encryption and decryption?

Thursday, 03 August 2023 by EITCA Academy

The Data Encryption Standard (DES) is a symmetric block cipher cryptosystem that operates on 64-bit blocks of data. The key schedule in DES is responsible for generating the subkeys used in each round of encryption and decryption. The key schedule takes the original 64-bit key and produces 16 round subkeys, each consisting of 48 bits.

  • Published in Cybersecurity, EITC/IS/CCF Classical Cryptography Fundamentals, DES block cipher cryptosystem, Data Encryption Standard (DES) - Key schedule and decryption, Examination review
Tagged under: Cybersecurity, Data Encryption Standard, Decryption, DES, Encryption, Key Schedule, Subkeys
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EITCA Academy is a part of the European IT Certification framework

The European IT Certification framework has been established in 2008 as a Europe based and vendor independent standard in widely accessible online certification of digital skills and competencies in many areas of professional digital specializations. The EITC framework is governed by the European IT Certification Institute (EITCI), a non-profit certification authority supporting information society growth and bridging the digital skills gap in the EU.

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