olemus
ISO/IEC 11770-1:
tarbetuks muutunud võtmete turvalise hävitamise teenus
= service for the secure destruction of keys that are no longer needed

ülevaateid
https://security.stackexchange.com/questions/51090/what-is-the-meaning-of-key-deletion-operation

https://nvlpubs.nist.gov/nistpubs/specialpublications/nist.sp.800-57pt1r5.pdf