Spies during the war practiced cryptography, making sure to send the information they gathered in private, coded forms.

Symmetric algorithms are used in cryptography when two people share a secret code and key for communication.

Mob members felt that studying cryptography would allow them to write and read messages in code and keep the feds out of their affairs.

Being interested in cryptography, the science major created his own top-secret writing system.

Failing to keep their club’s secret language confidential, the boys studied cryptography books to help them come up with a new writing system.