Encryption communication apparatus
First Claim
1. An encryption communication apparatus for encrypting and transmitting data having binary-coded data strings of plural bits, said apparatus comprising:
- data dividing means for dividing the data strings into a plurality of data units, each data unit representing image data for a sheet of data of a predetermined sheet size;
designating means for designating, for each data unit, one or more bit positions within a front blank portion of the data unit having a predetermined bit number, with the designated bit positions being different for each data unit;
bit data inverting means for inverting binary-coded data in the bit positions of the data unit designated by said designating means;
encrypting means for generating encrypted data by subjecting each data unit, including the binary-coded data inverted by the bit data inverting means, to a predetermined encryption process; and
transmitting means for transmitting the encrypted data to a communication line.
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Accused Products
Abstract
An encryption communication apparatus of the present invention is embodied, for example, by a facsimile machine. A document original of plural pages set on the facsimile machine is read by a scanner section, and converted into image data on a page-by-page basis. A value N1 represents the second of the clock time at which the reading of each page of the document original is completed, and binary-coded data in an N1-th bit position counted from the front bit of each page of image data is inverted. Then, the image data is subjected to a predetermined encryption process, and transmitted in the form of facsimile signals via a communication line. Binary-coded data corresponding to a given pixel in the front portion (left upper portion) of the image data on each page of the document original is inverted. Therefore, even if a third party obtains the encrypted data corresponding to the front portion of the image data, decryption is very difficult and encryption security is ensured.
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Citations
9 Claims
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1. An encryption communication apparatus for encrypting and transmitting data having binary-coded data strings of plural bits, said apparatus comprising:
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data dividing means for dividing the data strings into a plurality of data units, each data unit representing image data for a sheet of data of a predetermined sheet size; designating means for designating, for each data unit, one or more bit positions within a front blank portion of the data unit having a predetermined bit number, with the designated bit positions being different for each data unit; bit data inverting means for inverting binary-coded data in the bit positions of the data unit designated by said designating means; encrypting means for generating encrypted data by subjecting each data unit, including the binary-coded data inverted by the bit data inverting means, to a predetermined encryption process; and transmitting means for transmitting the encrypted data to a communication line. - View Dependent Claims (2, 3, 4)
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5. An encryption communication apparatus for encrypting and transmitting data having binary-coded data strings of plural bits, said apparatus comprising:
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data reading means for reading original image data on a page-by-page basis; designating means for designating, for each one-page image data unit of a document original read by said data reading means, one or more bit positions within the front blank portion of the data unit having a predetermined bit number, with the designated bit positions being different for each data unit; bit data inverting means for inverting binary-coded data in the bit positions of the data unit designated by said designating means; encrypting means for generating encrypted data by subjecting each data unit, including the binary-coded data inverted by the bit data inverting means, to a predetermined encryption process; and transmitting means for transmitting the encrypted data to a communication line. - View Dependent Claims (6)
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7. An encryption communication apparatus for encrypting and transmitting data having binary-coded data strings of plural bits, said apparatus comprising:
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random number generating means for designating, for each data unit of a predetermined standard size, one or more bit positions within a front portion of the data unit having a predetermined bit number by generating one or more random numbers not greater than the predetermined bit number to designate the bit positions, bit data inverting means for inverting binary-coded data in the bit positions of the data unit designated by said random number generating means; encrypting means for generating encrypted data by subjecting each data unit, including the binary-coded data inverted by the bit data inverting means, to a predetermined encryption process; and transmitting means for transmitting the encrypted data to a communication line. - View Dependent Claims (8)
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9. An encryption communication apparatus for encrypting and transmitting data having binary-coded data strings of plural bits, said apparatus comprising:
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clock means for designating, for each data unit of a predetermined standard size, one or more bit positions within a front portion of the data unit having a predetermined bit number, by detecting the present time and the value of the second of the present time when the data unit is read and using the detected value to designate the one or more bit positions; bit data inverting means for inverting binary-coded data in the bit positions of the data unit designated by said designating means; encrypting means for generating encrypted data by subjecting each data unit, including the binary-coded data inverted by the bit data inverting means, to a predetermined encryption process; and transmitting means for transmitting the encrypted data to a communication line.
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Specification