olemus
(1a) füüsiline
Wiktionary:
1. a chain or ring to which a key may be attached

(1b) krüptovõtmete digihoidla
Wiktionary:
3. (cryptography) a digital repository for the storage of cryptographic keys

(2) OS X: paroolihaldussüsteem
= the password management system in OS X
https://en.wikipedia.org/wiki/Keychain_(software)

(3) roteeritav krüptovõtmete sari ruuteritevahelise side turbeks
= a set of cryptographic keys for securing the inter-router communication
https://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-0/security/configuration/guide/sc40crsbook_chapter5.html