VERIFICATION OF SIGNED DIGITAL DOCUMENTS

摘要

Methods, apparatus, and systems are disclosed for, among other things, secure passphrase handling for computing devices. In one respect, a method is provided. The method includes receiving a plurality of passphrase elements from an input device. The method also includes performing a sequence of secure delay processing operations, each operation generating a delayed output value from an initial value. The passphrase is verified upon completion of the sequence of secure delay processing operations. Further, initial values of respective secure delay processing operations are based on respective passphrase elements and, for each secure delay processing operation after a first secure delay processing operation, a delayed output value from at least one other secure delay processing operations.

主权项

1. A method of verifying signed digital documents, the method comprising:
receiving a signed digital document, said signed digital document including an embedded digital signature; generating an intermediate document, said intermediate document excluding the embedded digital signature; generating a validation signature based on user authentication information identifying a signer of the signed digital document and the intermediate document, the validation signature comprising a computed value representing the signed digital document before embedding of the embedded digital signature; and verifying whether the signed digital document was signed by the signer based on a comparison of the validation signature to the embedded digital signature.