Notes 2020/21

2020-10-06.md - modular arithmetic, classical ciphers
2020-10-13.md - cryptanalysis of classical ciphers, algorithms with numbers
2020-10-20.md - algorithms with numbers, groups
2020-10-27.md - LFSR, Shannon theory
2020-11-03.md - block ciphers
2020-11-10.md - RSA, Chinese remainder theorem
2020-11-17.md - attacks on RSA
2020-11-24.md - Jacobi symbols
2020-12-01.md - primality testing and factorization
2020-12-08.md - ElGamal cryptosystem
2020-12-15.md - Discrete logarithm problem
2020-12-22.md - Digital signatures
2021-01-05.md - Hash functions
2021-01-12.md - Elliptic curves