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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.