| 发明名称 |
Encrypting system of data |
| 摘要 |
A data encrypting system according to the CBC system involves a limitation in a range of a numerical value which expresses data (smaller than a predetermined integer N). The encrypting system has an encrypting apparatus including a block encrypting section for receiving data, which is expressed by an integer value X smaller than a predetermined integer value N, for executing a data conversion C=enc (X) where 0</=C</=N-1 using an RSA algorithm, and for outputting C; and an arithmetic operating section connected to receive data, as one input, which is expressed by an integer value M smaller than the integer value N, and the output C of the block encrypting section as the other input, for performing an arithmetic operation for both of the inputs so that a resultant arithmetic value is smaller than the integer value N, and for outputting the arithmetic value as an input of the block encrypting section. Further, a decoding apparatus has a block decoding section for receiving data which is expressed by an integer value C smaller than the integer value N, for executing an inverse conversion Y=dec (C) of the encrypting for the input signal by using the RSA algorithm; and a modulo subtracting section for subtracing the input data C from the output Y of the block decoding section and for outputting a remainder M' M'=Y-C (mod N) which is derived by dividing a resultant subtracted value by the integer value N.
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| 申请公布号 |
US4969190(A) |
申请公布日期 |
1990.11.06 |
| 申请号 |
US19890336796 |
申请日期 |
1989.04.12 |
| 申请人 |
HITACHI, LTD.;HITACHI CONTROL SYSTEMS, INC. |
发明人 |
TAKARAGI, KAZUO;NAKAGAWA, FUSAO;NAGAI, YASUHIKO;SASAKI, RYOICHI |
| 分类号 |
G09C1/00;H04L9/06;H04L9/26;H04L9/28;H04L9/30 |
主分类号 |
G09C1/00 |
| 代理机构 |
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