[FEATURE] Addition of S-AES (Simplified AES) cipher in ciphers directiory.

[Charuhas10]

Detailed description

Addition of S-AES cipher for a better understanding of AES structure and algorithm. S-AES (Simplified AES) was developed by Professor Edward Schaefer of Santa Clara University and several of his students. It is an educational rather than a secure encryption algorithm. It has similar properties and structure to AES with much smaller parameters. It is intended to be used as a teaching tool for students to learn about AES and block ciphers in general. It is not intended to be used for any other purpose.

Difference between S-AES and AES

S-AES is a simplified version of AES. It has a smaller key size and a smaller number of rounds. It is not secure and should not be used for any purpose other than educational purposes. It is not a replacement for AES.

S-AES Parameters :

Block Size: 64 bits Key Size: 64 bits Number of Rounds: 4 Number of Subkeys: 4 Number of S-Boxes: 4 Number of S-Box Bits: 4 Number of S-Box Inputs: 16 Number of S-Box Outputs: 16

S-AES Algorithm

The encryption algorithm takes a 16-bit block of plaintext as input and a 16-bit key and produces a 16-bit block of ciphertext as output. The S-AES decryption algorithm takes a 16-bit block of ciphertext and the same 16-bit key used to produce that ciphertext as input and produces the original 16-bit block of plaintext as output. The encryption algorithm involves the use of four different functions, or transformations: add key, nibble substitution (NS), shift row (SR), and mix column (MC), whose operation is explained subsequently. We can concisely express the encryption algorithm as a composition of functions: image Each function operates on a 16-bit state, treated as a matrix of nibbles, where one nibble is a 4-bit number. The initial state matrix is the 16-bit plaintext, State is modified by each subsequent function in the encryption process, producing after the last function the 16-bit ciphertext.

Context

I am raising this issue to propose the addition of the S-AES (Simplified Advanced Encryption Standard) cipher to the ciphers directory as a simpler demonstration model for AES, making it easier to understand and implement for beginners. By incorporating S-AES into this repository, it would serve as a valuable resource for students, educators, and enthusiasts venturing into the realm of encryption. Its simplicity against the full-fledged AES offers a gradual learning curve, making cryptographic concepts more accessible to a broader audience.

Possible implementation

No response

Additional information

No response

[Charuhas10]

Please assign the task of implementing S-AES to this repository.

[github-actions[bot]]

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[github-actions[bot]]

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