发明名称 |
ENCRYPTION EVALUATION DEVICE, ENCRYPTION EVALUATION METHOD, AND ENCRYPTION EVALUATION PROGRAM |
摘要 |
An encryption evaluation device 100 is a device evaluating the security of a block cipher encrypting data of a predetermined size for each block by repeatedly executing, a predetermined number of rounds, a round process using a round function converting data based on a key. The encryption evaluation device 100 includes: a structure specification information accepting part 101 configured to accept structure specification information for specifying a structure of the block cipher; and a security index value calculating part 102 configured to specify a non-use number as the number of round functions that are not used in meet-in-the-middle attack, based on the accepted structure specification information, and calculate a security index value indicating a calculation amount required to specify the key by performing the meet-in-the-middle attack, based on the specified non-use number. |
申请公布号 |
US2014328482(A1) |
申请公布日期 |
2014.11.06 |
申请号 |
US201214370254 |
申请日期 |
2012.09.18 |
申请人 |
NEC Software Hokuriku, Ltd. |
发明人 |
Saito Teruo |
分类号 |
H04L9/00;H04L9/30 |
主分类号 |
H04L9/00 |
代理机构 |
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代理人 |
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主权项 |
1. An encryption evaluation device evaluating security of a block cipher encrypting data of a predetermined size for each block by repeatedly executing a round process a predetermined number of rounds, the round process using a round function converting data based on a key, the encryption evaluation device comprising:
a structure specification information accepting unit accepting structure specification information for specifying a structure of the block cipher; and a security index value calculating unit for specifying a non-use number as a number of round functions that are not used in meet-in-the-middle attack, based on the accepted structure specification information, and calculating a security index value indicating a calculation amount required to specify the key by performing the meet-in-the-middle attack, based on the specified non-use number. |
地址 |
Ishikawa JP |