An encryption method that uses the same secret key to encrypt and decrypt messages. Contrast with "public key cryptography," which uses a two-part key; one public and one private. THIS DEFINITION ...

Researchers have broken a distance record in quantum communication by sending a secret encryption key nearly 13,000 km from China to South Africa, using a cheap, lightweight ‘microsatellite’.

An encryption key that is kept concealed because its discovery voids the security of the encryption session. A secret key generally refers to the secret key cryptography system, in which both ...

According to quantum theory, communication systems based on single-photon signals, where two parties share random secret keys known only to them, could provide unbreakable encryption. However ...