EP0807908A3

Digital signatures on a smartcard

Abstract

A digital signature scheme for a "smart" card utilizes a set of prestored signing elements and combines pairs of the elements to produce a new session pair. The combination of the elements is performed partly on the card and partly on the associated transaction device so that the exchange of information between card and device does not disclose the identity of the signing elements. The signing elements are selected in a deterministic but unpredictable manner so that each pair of elements is used once. Further signing pairs are generated by implementing the signing over an anomalous elliptic curve encryption scheme and applying a Frobenius Operator to the normal basis representation of one of the elements.

EP0807908A3, drawing sheet 1 — Sheet 1 of 1

Term

Term ended

Projected expiry passed 15 April 2017, 9.4 years ago.

1 sheet

Sheet 1

Every citation, both waysCites: the store holds 0 of 1

Citations
Reference	Relation	Cited during
KOBLITZ N: "CM-CURVES WITH GOOD CRYPTOGRAPHIC PROPERTIES", ADVANCES IN CRYPTOLOGY. SANTA BARBARA, AUG. 11 - 15, 1991, PROCEEDINGS OF THE CONFERENCE ON THEORY AND APPLICATIONS OF CRYPTOGRAPHIC TECHNIQUES (CRYPTO), BERLIN, SPRINGER, DE, 1991, pages 279 - 287, XP000269035	Non-patent	Search report
MEIER W ET AL: "EFFICIENT MULTIPLICATION ON CERTAIN NONSUPERSINGULAR ELLIPTIC CURVES", ADVANCES IN CRYPTOLOGY - CRYPTO. SANTA BARBARA, AUG. 16 - 20, 1992, PROCEEDINGS OF THE ANNUAL INTERNATIONAL CRYPTOLOGY CONFERENCE, BERLIN, SPRINGER, DE, vol. CONF. 12, 16 August 1992 (1992-08-16), pages 333 - 344, XP000953275, ISBN: 3-540-57340-2	Non-patent	Search report
SCHOOF R: "ELLIPTIC CURVES OVER FINITE FIELDS AND THE COMPUTATION OF SQUARE ROOTS MOD P", MATHEMATICS OF COMPUTATION, AMERICAN MATHEMATICAL SOCIETY, US, vol. 44, no. 169/170, April 1985 (1985-04-01), pages 483 - 494, XP000827780	Non-patent	Search report
LAY G-J ET AL: "CONSTRUCTING ELLIPTIC CURVES WITH GIVEN GROUP ORDER OVER LARGE FINITE FIELDS", ALGORITHMIC NUMBER THEORY, INTERNATIONAL SYMPOSIUM, XX, XX, 1994, pages 250 - 263, XP000905117	Non-patent	Search report
MUELLER V: "Fast Multiplication on Elliptic Curves over Small Fields of Characteristic Two", PUBLICATIONS, TU DARMSTADT, 1997, XP002121579, Retrieved from the Internet <URL:ftp://ftp.informatik.tu-darmstadt.de/pub/Tl/reports/vmueller.jc.ps.gz> [retrieved on 199910]	Non-patent	Search report

17 members in 3 offices

This recordMember, by publication datePriority claim

Priority claims5

Priority claims
Document	Office	Kind	Date
632845	United States of America	–	1996-04-16
63284596	United States of America	A	1996-04-16
63284596	United States of America	A	1996-04-16
632845	–	–	–
US19960632845	–	–	–

Members17

Family members, oldest first
Document	Office	Kind
CA2202566A1	Canada	A1	1997-10-16
CA2540787A1	Canada	A1	1997-10-16
CA2640992A1	Canada	A1	1997-10-16
EP0807908A2	European Patent Office (EPO)	A2	1997-11-19
US5999626A	United States of America	A	1999-12-07
US2002095583A1	United States of America	A1	2002-07-18
US6704870B2	United States of America	B2	2004-03-09
EP0807908A3This record	European Patent Office (EPO)	A3	2004-04-14
US2005039023A1	United States of America	A1	2005-02-17
US6925564B1	United States of America	B1	2005-08-02
CA2202566C	Canada	C	2006-12-12
US2007177726A1	United States of America	A1	2007-08-02
CA2540787C	Canada	C	2008-09-16
US2008310625A1	United States of America	A1	2008-12-18
EP0807908B1	European Patent Office (EPO)	B1	2014-06-25
EP2800043A1	European Patent Office (EPO)	A1	2014-11-05
EP2800043B1	European Patent Office (EPO)	B1	2019-10-09

41 legal events, as 4 offices reported them to INPADOC

Over the term

Point at a mark for the event

Events

Legal events, newest first
	Event	Code	Office
2017-07-31	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2017-05-10	Patent expired after termination of 20 yearsExpiredPE20	PE20	GB
2017-04-15	Expiry of rightR071	R071	DE
2016-08-31	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2016-07-29	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2016-07-29	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2016-04-25	Fee paymentPLFP	PLFP	FR
2015-06-03	No opposition filedOpposition26N	26N	EP
2015-05-01	No opposition filed within time limitOppositionORIGINAL CODE: 0009261PLBE	PLBE	EP
2015-05-01	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: NO OPPOSITION FILED WITHIN TIME LIMITSTAA	STAA	EP
2015-03-26	No opposition filed against granted patent, or epo opposition proceedings concluded without decisionGrantedR097	R097	DE
2014-08-07	Dpma publication of mentioned ep patent grantGrantedR096	R096	DE
2014-06-25	Designated contracting statesAK	AK	EP
2014-06-25	European patent grantedGrantedFG4D	FG4D	GB
2014-05-23	(expected) grantORIGINAL CODE: 0009210GRAA	GRAA	EP
2014-05-21	Grant fee paidORIGINAL CODE: EPIDOSNIGR3GRAS	GRAS	EP
2014-01-29	Intention to grant announcedINTG	INTG	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2014-01-10	Despatch of communication of intention to grant a patentORIGINAL CODE: EPIDOSNIGR1GRAP	GRAP	EP
2013-12-11	Amendment of ipc main classPREVIOUS MAIN CLASS: G06F0017600000R079	R079	DE
2011-10-26	Party data changed (applicant data changed or rights of an application transferred)RAP1	RAP1	EP
2004-12-29	First examination report despatched17Q	17Q	EP
2004-12-15	Request for examination filed17P	17P	EP
2004-04-14	Designated contracting statesAK	AK	EP
2004-04-14	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2004-04-14	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2004-04-14	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2004-04-14	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2004-02-27	Search report despatchedORIGINAL CODE: 0009013PUAL	PUAL	EP
1997-11-19	Designated contracting statesAK	AK	EP
1997-10-03	Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI	PUAI	EP

Digital signatures on a smartcard

Abstract

Term

Priority claims5

Members17

Over the term

Events

Numbers

Titles3

Classification

Designated states1