The process of overwriting, erasing, or physically destroying a key so that it cannot be recovered.
Source(s):
NIST SP 800-57 Part 2
[Superseded]
The process of overwriting, erasing, or physically destroying information (e.g., a cryptographic key) so that it cannot be recovered. See NIST SP 800-88.
Source(s):
NIST SP 800-57 Part 2 Rev.1