公开(公告)号：WO2004014020A8

公开(公告)日：2004-04-22

申请号：PCT/IB0303187

申请日：2003-07-07

Applicant: IBM ,  CAMENISCH JAN ,  KOPROWSKI MACIEJ

Inventor： CAMENISCH JAN ,  KOPROWSKI MACIEJ

IPC: G09C1/00 ,  H04L9/32

CPC classification number: H04L9/14 ,  H04L9/3255

Abstract: The presented methods form the basis of a forward-secure signature scheme that is provably secure. Moreover, the presented methods form also the basis of a fine-grained forward-secure signature scheme that is secure and efficient. The scheme allows to react immediately on hacker break-ins such that signatures from the past still remain valid without re-issuing them and future signature values based on an exposed key can be identified accordingly. In general, each prepared signature carries an ascending index such that once an index is used, no lower index can be used to sign. Then, whenever an adversary breaks in, an honest signer can just announce the current index, e.g., by signing some special message with respect to the current index, as part of the revocation message for the current time period. It is then understood that all signatures made in prior time periods as well as all signatures make in the revoked period up to the announced index are valid, i.e., non-reputable.

Abstract translation: 所提出的方法构成了可靠安全的前向安全签名方案的基础。 此外，提出的方法也是安全有效的细粒度前向安全签名方案的基础。 该方案允许立即对黑客入侵进行反应，使得过去的签名仍然保持有效，而不重新发布它们，并且可以相应地识别基于暴露密钥的未来签名值。 一般来说，每个准备的签名都带有上升索引，使得一旦使用索引，就不能使用较低的索引进行签名。 那么，每当对手中断时，一个诚实的签名者就可以通过例如通过当前索引签署一些特殊消息来宣布当前的索引，作为当前时间段的撤消消息的一部分。 据了解，在先前的时间段内进行的所有签名以及在所宣布的索引的撤销时间内的所有签名都是有效的，即非信誉的。

公开(公告)号：DE60318073T2

公开(公告)日：2008-12-11

申请号：DE60318073

申请日：2003-07-07

Applicant: IBM

Inventor： CAMENISCH JAN ,  KOPROWSKI MACIEJ

IPC: G09C1/00 ,  H04L9/32

Abstract: The presented methods form the basis of a forward-secure signature scheme that is provably secure. Moreover, the presented methods form also the basis of a fine-grained forward-secure signature scheme that is secure and efficient. The scheme allows to react immediately on hacker break-ins such that signatures from the past still remain valid without re-issuing them and future signature values based on an exposed key can be identified accordingly. In general, each prepared signature carries an ascending index such that once an index is used, no lower index can be used to sign. Then, whenever an adversary breaks in, an honest signer can just announce the current index, e.g., by signing some special message with respect to the current index, as part of the revocation message for the current time period. It is then understood that all signatures made in prior time periods as well as all signatures make in the revoked period up to the announced index are valid, i.e., non-reputable.

公开(公告)号：DE60318073D1

公开(公告)日：2008-01-24

申请号：DE60318073

申请日：2003-07-07

Applicant: IBM

Inventor： CAMENISCH JAN ,  KOPROWSKI MACIEJ

IPC: G09C1/00 ,  H04L9/32

Abstract: The presented methods form the basis of a forward-secure signature scheme that is provably secure. Moreover, the presented methods form also the basis of a fine-grained forward-secure signature scheme that is secure and efficient. The scheme allows to react immediately on hacker break-ins such that signatures from the past still remain valid without re-issuing them and future signature values based on an exposed key can be identified accordingly. In general, each prepared signature carries an ascending index such that once an index is used, no lower index can be used to sign. Then, whenever an adversary breaks in, an honest signer can just announce the current index, e.g., by signing some special message with respect to the current index, as part of the revocation message for the current time period. It is then understood that all signatures made in prior time periods as well as all signatures make in the revoked period up to the announced index are valid, i.e., non-reputable.

公开(公告)号：AU2003247053A1

公开(公告)日：2004-02-23

申请号：AU2003247053

申请日：2003-07-07

Applicant: IBM

Inventor： CAMENISCH JAN ,  KOPROWSKI MACIEJ

IPC: G09C1/00 ,  H04L9/32

Abstract: The presented methods form the basis of a forward-secure signature scheme that is provably secure. Moreover, the presented methods form also the basis of a fine-grained forward-secure signature scheme that is secure and efficient. The scheme allows to react immediately on hacker break-ins such that signatures from the past still remain valid without re-issuing them and future signature values based on an exposed key can be identified accordingly. In general, each prepared signature carries an ascending index such that once an index is used, no lower index can be used to sign. Then, whenever an adversary breaks in, an honest signer can just announce the current index, e.g., by signing some special message with respect to the current index, as part of the revocation message for the current time period. It is then understood that all signatures made in prior time periods as well as all signatures make in the revoked period up to the announced index are valid, i.e., non-reputable.

公开(公告)号：CA2494078C

公开(公告)日：2010-11-23

申请号：CA2494078

申请日：2003-07-07

Applicant: IBM

Inventor： CAMENISCH JAN ,  KOPROWSKI MACIEJ

IPC: G09C1/00 ,  H04L9/32

Abstract: The presented methods form the basis of a forward-secure signature scheme that is provably secure. Moreover, the presented methods form also the basis of a fine-grained forward-secure signature scheme that is secure and efficient. The scheme allows to react immediately on hacker break-ins such that signatures from the past still remain valid without re-issuing them and future signature values based on an exposed key can be identified accordingly. In general, each prepared signature carries an ascending index such that once an index is used, no lower index can be used to sign. Then, whenever an adversary breaks in, an honest signer can just announce the current index, e.g., by signing some special message with respect to the current index, as part of the revocation message for the current time period. It is then understood that all signatures made in prior time periods as well as all signatures make in the revoked period up to the announced index are valid, i.e., non-reputable.

公开(公告)号：CA2494078A1

公开(公告)日：2004-02-12

申请号：CA2494078

申请日：2003-07-07

Applicant: IBM

Inventor： CAMENISCH JAN ,  KOPROWSKI MACIEJ

IPC: G09C1/00 ,  H04L9/32

Abstract: The presented methods form the basis of a forward-secure signature scheme th at is provably secure. Moreover, the presented methods form also the basis of a fine-grained forward-secure signature scheme that is secure and efficient. T he scheme allows to react immediately on hacker break-ins such that signatures from the past still remain valid without re-issuing them and future signatur e values based on an exposed key can be identified accordingly. In general, ea ch prepared signature carries an ascending index such that once an index is use d, no lower index can be used to sign. Then, whenever an adversary breaks in, a n honest signer can just announce the current index, e.g., by signing some special message with respect to the current index, as part of the revocation message for the current time period. It is then understood that all signatur es made in prior time periods as well as all signatures make in the revoked period up to the announced index are valid, i.e., non-reputable.