Crypt (noun)

1. A subterranean chamber used for burial purposes, especially in a church or cathedral.
2. A secure room or vault for storing valuables or information.
3. A code or system of encryption used to conceal the meaning of a message.

Origin:

Derived from the greek word 'kruptos' meaning 'hidden' or 'secret'.

Examples:

1. The crypt beneath the church contains the remains of several notable figures from history.
2. The treasure was hidden in a secret crypt behind the painting.
3. The government uses a highly advanced crypt to protect classified information.
4. Many people visit the crypt to pay their respects to the deceased.
5. The spy used a crypt to encode his messages and protect their contents from enemies.