Forward-secure digital signature method and system capable of balancing cost
A digital signature and forward security technology, applied in the field of information security, can solve problems such as difficult calculations, and achieve high security effects
Inactive Publication Date: 2010-05-12
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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) However, if the square root of U is not known, then F σ -1 is difficult to calculate
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[0066] The implementation of the present invention has been described in detail in the part of the summary of the invention, and will not be repeated here. However, it should be noted that: according to different application requirements and different security level requirements, parameters of different scales can be used: N, l, etc. In addition, in different application environments, designers need to set a suitable value of l' according to needs, so the present invention can have many specific implementation modes.
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The invention belongs to the technical field of information security, and relates to a problem of signing digital information, in particular to a digital signature method and a digital signature system which can reduce the influence on the leakage of a signing key and are more applicable. Compared with a common digital signature, the signature method has a key updating algorithm, and realizes forward security of the signing key, namely, even if a rival obtains the signing key in a current time range, the rival cannot forge a legal signature belonging to the previous time range through the key so as to protect the validity of the previous signatures and reduce the loss caused by the leakage of the key. Besides, according to a specific application condition and on the basis of equivalent security, the scheme can allow a project planner to select proper key storage cost and computation cost according to hardware conditions and make full use of the storage capacity and computation ability of hardware so as to enable the key storage cost and the computation cost to achieve perfect balance.
Description
technical field [0001] The invention belongs to the technical field of information security, and relates to the problem of signing digital information, more precisely, it relates to a method that can reduce the impact of signature key leakage and allow designers to obtain a perfect balance between storage cost and calculation cost according to application requirements. Digital signature method and system. Background technique [0002] The concept of forward security signature was introduced by Anderson in 1997, the purpose is to solve a major flaw of the usual digital signature, that is, once the secret key is lost (or stolen), all the signatures previously generated by this key become invalid. invalid. In order to reduce such losses, Anderson proposes to divide the validity period of the key into periods. At the end of each period, the signer obtains a new secret key for the next period from the secret key of the current period in a one-way mode, and Securely delete secre...
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Inventor 许春香张辉
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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