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The Pitney Bowes iButton Postal Security Device (PSD) has been designed in compliance with the United States Postal Service (USPS), Information-Based Indicia Program (IBIP). It employs strong encryption, decryption, and digital signature techniques for the protection of customer funds and the production of postage meter indicia in a variety of Pitney Bowes Metering products. The PSD has been designed to support international postal markets and their evolving requirements for digital indicia.