Sophie Germain Prime Project The Sophie Germain Prime Project primarily aims to collect, analyse and distribute Sophie Germain primes. Such special prime numbers p have the additional condition that 2p + 1 is also prime (called a safe prime). Additional categorisation is provided for Safe primes (prime p with (p-1)/2 also prime) and Blum primes (p = 3 mod 4). Sophie Germain primes find extensive use in public key cryptography (like the Diffie-Hellman key exchange, SGCM and BBS) and primality tes...