Mike Meyers CompTIA Security+ Certification Passport (Exam SY0-601) by Dawn Dunkerley

Author:Dawn Dunkerley
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2021-02-15T00:00:00+00:00

Ephemeral Keys

Ephemeral keys are the converse of static keys, in that they are temporary by nature, whereas static keys are semi-permanent (the typical life span of a static key is one to two years). Often, ephemeral keys are generated for each execution of the key establishment process and are unique to a message or session. However, they can be used more than once when a sender generates only one ephemeral key pair for a message and the private key is combined with each distinct recipient’s public key. The benefit of using an ephemeral key is that if a particular secret key is leaked or compromised, the other messages encrypted by the system remain unreadable because each encryption session generates its own unique keys (see “Perfect Forward Secrecy,” next).

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