Overview#Ephemeral Key is a Cryptographic Key is called ephemeral if it is generated for each execution of a key establishment process.
Ephemeral Key may be used more than once, within a single session (e.g., in broadcast applications) where the sender generates only one Ephemeral Key pair per message and the Private Key is combined separately with each recipient's Public Key. Contrast with a static key.
Private ephemeral key agreement key: Private ephemeral key agreement keys are the private keys of asymmetric key pairs that are used only once to establish one or more keys (e.g., key wrapping keys, data encryption keys, or MAC keys) and, optionally, other keying material (e.g., Initialization Vectors).
Public Ephemeral Key agreement key#Public Ephemeral Key agreement keys are the Public Keys of asymmetric Key pairs that are used in a single Key-Exchange transaction to establish one or more keys (e.g., key wrapping keys, data encryption keys, or MAC keys) and, optionally, other keying material (e.g., Initialization Vectors).
More Information#There might be more information for this subject on one of the following:
- Cryptographic Key
- Diffie-Hellman or RSA
- Open Protocol for Access Control, Identification, and Ticketing with privacY
- Password-authenticated Key Exchange
- TLS Full Handshake