发明名称 ENCRYPTION/DECRYPTION METHOD, ITS APPARATUS, AND PROGRAM THEREFOR
摘要 <P>PROBLEM TO BE SOLVED: To prevent the marker code of an inhibited code from being generated in encryption data, while using an existing encryption system. <P>SOLUTION: It is discriminated, concerning the i-th encryption code obtained by encrypting an i-th code, whether the inhibited code is present in the i-th encryption code or in combinations between the i-th code and (i+1)-th encryption code, between the i-th encryption code and (i+1)-th code, and between (i-1)-th code and the i-th encryption code (S503-S506). In the case such inhibited code is determined absent in respective cases, the i-th encryption code is determined as the encryption result of the i-th code (S507). <P>COPYRIGHT: (C)2005,JPO&NCIPI
申请公布号 JP2005020564(A) 申请公布日期 2005.01.20
申请号 JP20030184941 申请日期 2003.06.27
申请人 CANON INC 发明人 IWAMURA KEIICHI
分类号 G09C1/00;H04L9/36;H04N1/41;H04N1/44;H04N7/167;H04N19/33;H04N19/34;H04N19/467;H04N19/60;H04N19/63;H04N21/2347;H04N21/266;H04N21/2662;H04N21/4405;H04N21/8355 主分类号 G09C1/00
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