Algorithms folder

Various algorithms that operate on the ring of integers modulo n. Useful for cryptography.

• EEA: Extended Euclidean Algorithm
• GRC: Chinese Remainder Algorithm
• SOE: Sieve of Eratosthenes
• LCG: Linear Congruntial Generator
• RSA: Public-Key Encryption
• DH: Key Exchange

OTP folder

OTP

usage: otp.py [-h] [-s] key input output

OTP Encryption

positional arguments:
  key                   key file
  input                 input file
  output                output file

optional arguments:
  -h, --help            show this help message and exit
  -s, --secure          prevent key from being re-used

keygen

You use the keygen script to generate the key. It uses the python os.urandom() function internally.

usage: keygen.py [-h] size {kb,mb,gb,tb} path

Generate a key file

positional arguments:
  size           size of key file
  {kb,mb,gb,tb}  unit of size
  path           key file

• You can also use your own DRBG, seeded from a secondary key. This will reduce the key-length at the cost of weaker encryption.
• Another option is to use a TRNG, with a key-length the size of the message. This offers perfect/maximum encryption.