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Image encrypting method, image encrypting device, recording medium on which image encrypting procedures are recorded, and recording medium on which encrypted image file is recorded

  • US 6,938,028 B1
  • Filed: 09/21/1999
  • Issued: 08/30/2005
  • Est. Priority Date: 09/21/1998
  • Status: Expired due to Term
First Claim
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1. An image encrypting method, comprising:

  • a first process of inputting an image by reading an image file expressing the image;

    a second process of dividing said image file into portion image data of a predetermined unit;

    a third process of generating information incidental to said portion image data, said incidental information including boundary information which expresses a boundary dividing respective said portion image data; and

    a fourth process of encrypting every said portion image data to provide every said portion image data with security so that unauthorized access to the portion image data cannot be obtained without decrypting,wherein image-handling of said portion image data is performed by using said incidental information so that the image-handling is performed while said portion image data remains encrypted.

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