IBTTA’s transportation Glossary of Terms is an ever-changing list of terms used within the transportation and tolling industry.
The Glossary was updated in March, 2016. If you have suggestions for future additions, please contact us.
Keys must adhere to rules in order to be useful. The type of encryption used will determine some of those rules, for example key size. At a minimum, each Private Key should be unique. A Key Service is an organization that provides and manages Keys for an Application. The Key Service implements rules that insure that all Keys issued adhere to the policies for the Application. The Internet, which uses Keys to ensure privacy, has made Key Services something of a commodity.
Keys (Public and Private) are numbers that are used to encrypt data. In our case, the data being encrypted is in effect, the secure transaction. Keys come in two types: Public and Private. The User holds the Private Key in secret. Public Keys are tied to a specific Private Keys, with the possibility of having many Public Keys for each Private Key. The Public Key is used by Service Providers to decrypt and verify transactions encrypted by a Private Key on an On-Board Unit.