Decommission and Disposal

nShield Connect and nShield Solo

When an HSM reaches the end of its operational life it should be securely decommissioned and disposed of.

  1. The Security Procedures in the Customer’s Security Policy should describe the decommissioning process. To decommission the HSM, all secret information that is used to protect your Security World should be erased. See the Erasing a module from a Security World section in the User Guide for details of the HSM factory reset procedure. If the Customer’s Security Procedures have specific requirements concerning the erasing of application key material, these procedures should be performed before the factory reset is performed.

    An HSM factory reset will erase all application key material.

  2. If no further operational requirements exist for the HSM, Customer Security Procedures should describe the disposal process. The Customer Security Procedures concerning the transportation of the unit should be adhered to.

  3. The customer may have a secure destruction policy for decommissioned assets. As long as all secret information that is used to protect your Security World has been erased there is no requirement to securely destroy the HSM as it has been returned to its factory state.

  4. However if the HSM has malfunctioned in a way that it is not possible to determine whether secret information used to protect the Security World has been erased, that is, the possibility exists that secret information may still present in the HSM, then the customer must refer to their Security Procedures to determine if the HSM should be destroyed. One option here is to use a data destruction service offered by private companies who can destroy the equipment in accordance with approved standards and provide a certificate of data destruction. Customer Security Procedures should describe the destruction process that ensures that all HSM components that contains secrets are completely destroyed.

  5. Entrust will accept the return of decommissioned HSMs for secure destruction.

Recycling and disposal information

For recycling and disposal guidance, see the nShield product’s Warnings and Cautions documentation.

Security World

If the Security World resident on the decommissioned HSM is no longer required then the ACS and OCS should be erased.

  • The ACS can only be erased by a different Security World, for example, a replacement Security World. You can, and should, reuse the smart cards from a deleted Security Worlds ACS. If you do not reuse or destroy these cards, then an attacker with these smart cards, a copy of your data (for example, a weekly backup) and access to any nShield HSM can access your old keys.

  • The OCS can only be erased on the Security World that it was created for. Therefore, ensure that the OCS is erased as a final step before the HSM is decommissioned. The cards can then be used for a new Security World.

  • Once the steps outlined above any keys that exist in backup data are no longer usable.

If a new Security World is not required uninstall the Security World software. However, we recommend that you do not uninstall the Security World software unless you are either certain it is no longer required, or you intend to upgrade it.