mayank-02 / simplified-aes

Implementation of a simplified version of the AES algorithm

Simplified AES

Simplified AES (S-AES) is an educational tool designed to help students learn the structure of AES using smaller blocks and keys.

• Non-feistal block cipher
• Plaintext: 16 bit
• Key: 16 bit
• Ciphertext: 16 bit

SAES Structure

Key Expansion

Usage

Use the SimplifiedAES class in your program as follows.

For encryption:

from saes import SimplifiedAES

plaintext = 0b1101011100101000
key = 0b0100101011110101
ciphertext = SimplifiedAES(key).encrypt(plaintext) # 0b0010010011101100

For decryption:

from saes import SimplifiedAES

ciphertext = 0b0010010011101100
key = 0b0100101011110101
plaintext = SimplifiedAES(key).decrypt(ciphertext) # 0b1101011100101000

References

Check out theory.pdf for more information and worked out examples.

Authors

Mayank Jain

License

MIT

simplified-aes's Issues

Mixing columns

It seems as if the output of the function mix_columns() is different than what we get upon multiplying the given matrix with
{1 4}
{4 1}
and then looking up values from the standard multiplication table.
I just can't believe that output of this code would be wrong so I'm curious if there is another justification.