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Target releaseRelease 1.1
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Goals

The goal is to provide a reliable, secure, and timely method for certified devices to download credentials. 

Background and Strategic Fit

The purpose of this use case is to provide a defined method that a certified OBE can use to download subsequent batches of credentials. The step at hand is to top-up OBE identification certificates. It is similar to Step 19.3: Initial Download of OBE Identification Certificates. Differences are documented in this section. Also, see Step 19.4: Schedule generation of subsequent batch of OBE identification certificates for full details of the process to schedule certificate pre-generation.

Assumptions

Process Steps

  1. The OBE checks that, and if necessary waits until, the current time matches or is after the timestamp given in the .info file
  2. The OBE downloads the Local Policy File (LPF) and the Local Certificate Chain File (LCCF), as done before in Step 19.3: Initial Download of OBE Identification Certificates
    1. If there is an updated LCCF, OBE applies all changes to its trust-store (necessary for PCA Certificate Validations)
    2. If there is an updated LPF, OBE applies those changes
  3. The OBE downloads the new OBE identification certificates
  4. The OBE downloads .info file using the API documented in RA - Download .info File

Error Handling 

  • The EE will abandon further interactions with the RA after a certain number of failed communication attempts resulted in critical errors
  • The EE will not attempt to execute the certificate provisioning process if it finds itself on the latest CRL (assumes that a willful violator has not compromised the device). The device will need to execute the certification/bootstrap process again to exit a revoked state.
  • The EE may terminate the certificate batch download process if sufficient storage is not available for subsequent batches

Requirements

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Use Case 19.5 - Requirements

Design Notes

  • See Step 19.3: Initial Download of OBE Identification Certificates for full details of the download process
  • From the SCMS point of view, the basic process for "top-up" certificate downloads is the same as that used for initial provisioning as detailed in Step 19.3: Initial Download of OBE Identification Certificates. However, this is an incremental download and not a full download of all available certificate files. The number of files downloaded shall be factored in system sizing requirements.
  • From the OBE's point of view, the process is slightly different from the process for initial provisioning
  • The RA will record the last time an OBE established a connection. This last connection time will be used to stop pre-generating pseudonym certificates if there is no activity for a period of time.
  • The RA will automatically resume pre-generating pseudonym certificates when an OBE reestablishes a connection. The new certificates will be available for download at the time specified in the .info file.