Testing Scrambler, XOR-cipher, Hill-cipher, Feistel-cipher, DES (ECB, CBC, CFB, OFB, BC, PCBC, OFBNLF, EDE modes; simple double encryption; Davies-Price encryption mode; triple algorithm with three keys), Generating prime numbers with specific size, Searching for the first 100 primitive roots of a number, Diffie-Hellman Protocol Demonstration, RSA, Digital signature.