VeriFone DUET Vx810, Справочное руководство

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P
ERFORMING
D
OWNLOADS
File Authentication Requirements
V X 810 R
EFERENCE
G
UIDE
109
•
Downloaded certificates (receiving device) must synchronize with the
certificate data present in the certificate tree.
“Synchronized” means that the certificate tree of the receiving device can be
no more than one revision out-of-sync with the certificate tree on the sending
device or the files on the receiving device do not successfully authenticate. In
this case, the term revision refers to any generic change to the current
sponsor and signer certificates stored in the certificate tree of a deployment
device.
•
When the back-to-back download completes and all certificates and signature
files authenticate, the receiving device restarts. If the name of the *GO
application is specified in the Group 1 CONFIG.SYS file of the receiving
device, the application executes and the application prompt or logo is
displayed on the device.
Timing
Considerations Due
to the
Authentication
Process
The file authentication process takes some time. The total amount of time required
depends on a number of factors:
•
The number and size of application files.
•
The number of certificates and signature files.
•
Whether the file compression feature of Download Manager is being used to
perform the download.
Here are a few additional considerations that may affect the total elapsed time
required to complete the download operation:
•
Because additional processing steps are required, an operating system
download takes longer to complete than an application download (several
minutes as opposed to a few seconds).
•
The download order of a batch of certificate files may affect total processing
time. Digital certificates are validated in a looping process where the validation
process cycles as many times as necessary to establish the proper
relationship and position of a given certificate in the certificate tree that exists
in the device.
To optimize the authentication process, download certificates in a higher-level-
certificates-first order. This way, they process faster than a random order
download.