Enigma2001

Tom Jericho:
Every day, our Typex machines have to be set the same way the Germans set their Enigmas. And figuring out the settings is the hard part. That's where the code breakers come in.

Hester Wallace:
What would Claire need to decipher the settings?

Tom Jericho:
She'd need a crib. Let's say this tombstone was in code. If I knew more or less who's buried here, I'd have a pretty good idea what the code meant. You try to work out the settings and then type the coded message into the Enigma machine. If the message comes out nonsense, the settings are wrong. If it comes out "Mary Jane Hawkins," you've broken Enigma for that day.