# Cryptography

- [basic-mod1](/cryptography/basic-mod1.md)
- [basic-mod2](/cryptography/basic-mod2.md)
- [diffie-hellman](/cryptography/diffie-hellman.md)
- [morse-code](/cryptography/morse-code.md)
- [NSA Backdoor](/cryptography/nsa-backdoor.md)
- [Sequences](/cryptography/sequences.md)
- [substitution](/cryptography/substitution.md)
- [Sum-O-Primes](/cryptography/sum-o-primes.md)
- [Very Smooth](/cryptography/very-smooth.md)