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Abstract

This invention creates a portable digital identity of the individual that includes personal information, and may also include data representing the person's handwritten signature and one or more passwords. The digital identity optionally includes data representing seals, fingerprints and biometric information. The digital identity can be used to bind a verifiable electronic impression with an electronic document using electronic watermarks so that any modification in the document or the electronic impression bound to the document can be detected. The personal information included in the digital identifiers can include, in addition to a password, answers to questions that are composed by the user. The digital identity of a user can be created once and stored after encryption for protection. This digital identity can then be used by the signer to bind a unique instance of an impression of the digital identity to any document. Document and digital identity verification including verifying a cryptographic digital signature that establishes the integrity of the document, and ensures non-repudiation of origin to the extent that it was signed by the user's private key.

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First Claim