How may subkeys does DES cipher use?
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
What is the main difference between the use of subkeys in encryption and decryption in DES?
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
How does the key schedule in DES generate the subkeys used in each round of encryption and decryption?
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