An electronic device that serves the purpose of a car key by locking and unlocking a vehicle remotely.

plural of latch-key child

(US, UK, idiomatic) imprisoned with little or no chance of escape; locked up. / (US, UK, idiomatic) safely guarded; locked away.

A form of cryptography which allows users to communicate securely without previously agreeing on a shared secret key (abbreviation PKC)

The subfield of cryptography in which all information used to encode a message is assumed to be publicly available.

(idiomatic) A child who returns home from school to an empty house and therefore must unlock/unlatch the exterior door with a key, especially a child of working or absent parent(s).

(computing) A certificate that uses a digital signature to bind together a public key with an identity — used to verify that a public key belongs to an individual.

(computing) A function key whose function can be assigned by the user or by a program.

(computing, Internet) A value that is used to identify a key set.

To never release someone (e.g., from prison).