English to Spanish Bus/Financial Safety Seguridad en los bancos

Keys Handling at Bank branches
Keys can generally be classified into Critical and Non-critical. Critical keys are generally the keys for Cash Vault, Cash counter, Vault room and other sensitive keys of the branch. Non critical keys could be for the drawers, cupboards etc. Criticality is chiefly governed by the requirement of dual locking/custodians for sensitive storage like Cash Vault, Vault room etc. Non critical keys are keys for single custodians and are for non-sensitive but important storage like workstation drawers, cupboards etc. Agradezco sugerencias, lo único que se me ocurre es confidencial pero no tiene sentido.