Kikkoman

This is the reason computer geeks get excited about big prime numbers.

It is what SSL uses to allow “two users to exchange a secret key over an insecure medium without any prior secrets.”

I don’t really understand the math, but it is nice to see the equations. The hoopla over quantum computing from a cryptographic perspective is that it may make the discrete inverse logarithm problem that this algorithm relies on for its security easy to solve.