ATTRIBUTE-BASED DIGITAL SIGNATURES Russian patent published in 2017 - IPC H04L9/32 

FIELD: information technology.

SUBSTANCE: attribute-based digital signatures system comprises: the first module (1) for signature forming to form the first signature (10) for the document (11) based on the first key (12) of the signature and the document (11); and the resubscribtion module (2) made to form the second signature (13) for the document (11) based on the first signature (10) and the key (14) of resubscribtion, wherein the resubscribtion module (2) is made to process attributes (15, 16), linked to the first signature (10) and/or the second signature (13), wherein the second signature (13) is linked to the second set of attributes (16) determined by the key (14) of resubscribtion, wherein the second set of attributes (16) comprises a plurality of attributes; and the generator (3) of resubscribtion keys to form the key (14) of resubscribtion based on the second key (18) of the signature linked to the second set of attributes (16'), wherein the key (14) of resubscribtion allows to the resubscribtion module (2) to convert the first signature (10) to the second signature (13), linked to the second set of attributes (16), and wherein the second key (18) of the signature allows the second module (4) for signature forming to form the signature (19), linked to the second set of attributes (16") based on the document (11); the generator (3) of resubscribtion keys is made to additionally form the first key (12) of the signature based on the second key (18) of the signature, wherein the second key (12) of the signature and the key (14) of resubscribtion are formed as a pair of keys, and the first key (12) of the signature is provided to the first module (1) for signature forming, and the key (14) of resubscribtion is provided to the resubscribtion module (2).

EFFECT: improved data security through use of digital signature for document and possibility of change.

9 cl, 3 dwg