The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 2012
Filed:
Sep. 28, 2009
Azzedine Benameur, Caromb, FR;
Smriti Kumar Sinha, Tezpur, IN;
Paul El Khoury, Antibes, FR;
SAP AG, Walldorf, DE;
Abstract
The present description refers in particular to example computer-implemented methods, example computer program products, and example computer systems for automatically generating or verifying a digital signature for a message. The message may be representable in a hierarchical tree structure. An example computer-implemented method may comprise: selecting, from a message M, a sub-message M to be signed, the sub-message M comprising at least one element; generating a well-formed context Cfor the sub-message M, wherein the well-formed context Cdefines a derivation path to the element in the message Mat a time t, the element being marked [M] in the well-formed context C; generating a message digest δfrom the sub-message M and a context digest δfrom the well-formed context C; and generating a signature S by applying a secret key Sof a user A to the message digest δand to the context digest δ.