发明名称 |
SIGNATURE AND VERIFYING METHOD, AND SIGNATURE AND VERIFYING DEVICE |
摘要 |
An RSA signature method is provided in which the length of a signature does not depend on the number of signature devices when multiple signature devices are related to the creation of the signature. A signature device i_{m} includes first conversion means SS1B105 that performs no operation if a received signed text u_{i_{m-1}} exceeds a modulus n_{i_{m}} and, if not, adds an RSA-method-based signature; bijective conversion means S1B106 that multiplies the result by a function that maps the result to a value larger by the modulus n_{i_{m}}; second conversion means S1B107 that performs no operation if the operation result exceeds the modulus n_{i_{m}} and, if not, adds an RSA-method-based signature; and output means S1B109 that outputs the operation result as the signed text u_{i_{m}}. |
申请公布号 |
EP1819090(A1) |
申请公布日期 |
2007.08.15 |
申请号 |
EP20050806273 |
申请日期 |
2005.11.11 |
申请人 |
NEC CORPORATION |
发明人 |
TERANISHI, ISAMU;SAKO, KAZUE;TAGUCHI, DAIGO;NODA, JUN |
分类号 |
H04L9/32;H04L29/06 |
主分类号 |
H04L9/32 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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