Passport uses digital signatures to uniquely identify messages senders and facilitate digital receipts along with public key encryption for communications privacy. Digital certificates distribute, from secure sources, the digital certificates needed to allow all parties to a transaction to trust the communictions that take place.

Digital permits represent an an advanced application of secure documents that can be used for electronic versions of tickets, coupons, client authorizations, receipts and licenses. Digital permits are extremely flexible, yet very secure and private. They can be very portable, yet unalterabley maintain the identity of the issuer and user.

The architecture includes a digital certificate server, distributed registration authority, a digital permit server as system infrastructure and client / server front ends for digital signature signing / verification and encryption / decryption.

1. Authenticated identification based on digital signatures
2. Confidential message exchange based on public key encryption
3. Authenticated message integrity: receipt of the message, the whole message and nothing but the message
4. Authority management infrastructure
5. Legally binding digital receipts of transactions
6. On-line certificate validation
7. Root Key Rollover
8. Secure documents (digital permits) for information, authorization and/or permission interchange
9. Support of both RSA and ECC crypto libraries
10. Patented features optimizing performance for the realitites of wireless and constrained devices