| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an encryption method capable of reducing a processing load. <P>SOLUTION: In a step S1, a byte stream of an I picture constituting, for example, an MPEG format is divided into two byte streams, in a step S2, the two byte streams with each other are subjected to an exclusive OR operation, in a step S3, whether the number of dividing times satisfies the specified number of times is determined, and when it does not satisfy the specified number of times, one of the two byte streams is divided into two byte streams in the step S1 and the divided two byte streams are further subjected to an exclusive OR operation in the step S2, and in the step S3, when the number of dividing times satisfies the specified number of times, the byte stream with the smallest amount of data is encrypted in a step S4. <P>COPYRIGHT: (C)2008,JPO&INPIT |
