VeriFone VX 520 Specifications Page 77

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FILE AUTHENTICATION
Introduction to File Authentication
VX 520 R
EFERENCE GUIDE 77
Certificates Contain Keys That Authenticate Signature Files
Sponsor certificate: Certifies a client’s sponsorship of the terminal. It does
not convey the right to sign and authenticate files. To add flexibility to the
business relationships that are logically secured under the file authentication
process, a second type of certificate is usually required to sign files.
A sponsor certificate is authenticated under a higher-level system certificate,
called the application partition certificate.
Signer certificate: Certifies the right to sign and authenticate files for
terminals belonging to the sponsor.
A signer certificate is authenticated under the authority of a higher-level client
certificate (the sponsor certificate).
The required sponsor and signer certificates must either have been previously
downloaded and authenticated on the terminal, or they must be downloaded
together with the new signature and target files to authenticate.
Signer Private Keys Are Issued to Secure the File Signing Process
Signer private keys are loaded onto a smart card. This smart card is securely
delivered to the business entity that the terminal sponsor has authorized to sign,
download, and authenticate applications to run on the sponsor’s terminal.
The VeriFone CA can also issue additional sets of sponsor and signer certificates,
signer private keys to support multiple sponsors, and multiple signers for a
specific platform.
To establish the logical security of applications to download to a VX 520 terminal,
the designated signer uses the signer private key issued by the VeriFone CA as
this is a required input to the VeriShield File Signing Tool.
A signature file is generated using a signer private key. Successful authentication
depends on whether the signer private key used to sign the target file matches the
signer certificate stored in the terminal’s certificate tree.
NOTE
Only one sponsor certificate is permitted per terminal.
NOTE
The signer private keys loaded onto the smart card is the only copy of the private
key.
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