Patent US5233653A successfully refreshed from Google Patents.
US5233653A
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US
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Apparatus and method for enciphered facsimile transmission and reception
Assignee: Fujifilm Business Innovation Corp
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Filing: 1991-10-04
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Granted: 1993-08-03
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Expires: 2011-10-04
Abstract
Abstract An enciphered facsimile apparatus in which encoded image data is fetched one block at a time, and chained encipherment is executed in a reverse direction, respectively. Upon completion of encipherment, the enciphered image data is read in the reverse direction, and is demodulated to transmit to a network. Meanwhile, on the reception side, the enciphered image data received is fetched one block at a time, and deciphering is effected in the reverse direction. Upon completion of deciphering, decoding is effected in the reverse direction so as to confirm whether or not deciphering has been effected correctly. Thereby, the image data enciphered cannot be readily deciphered by a third party.
Inventors
- 👤 Masahiro Katsurabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:55
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/06; H04L9/0618; H04L9/0637; H04N; H04N1/00; H04N1/44; H04N1/448; H04N1/4486; H04L2209/00; H04L2209/34; H04L9/50
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
94 words
An apparatus for enciphered fascimile transmission of inputted data comprising: first storing means for storing a block of inputted data in sequential order; first reading means for reading said block of data from said first storing means in reverse sequential order; means for chain enciphering data read by said first reading means; second storing means for storing data chain enciphered by said chain enciphering means in sequential order; second reading means for reading data from said second storing means in reverse sequential order; and means for transmitting data read by said second reading means.
Claim 2
Independent Claim
94 words
An apparatus for enciphered fascimile transmission of inputted data comprising: first storing means for storing a block of inputted data in sequential order; first reading means for reading said block of data from said first storing means in reverse sequential order; means for chain enciphering data read by said first reading means; second storing means for storing data chain enciphered by said chain enciphering means in sequential order; second reading means for reading data from said second storing means in reverse sequential order; and means for transmitting data read by said second reading means.
Claim 3
Dependent Claim
99 words
An apparatus for enciphered fascimile transmission according to claim 1 further comprising means for receiving transmitted data including: third storing means for storing a block of received data in sequential order; third reading means for reading said block of data from said third storing means in reverse sequential order; means for deciphering said data read by said third reading means; fourth storage means for storing data deciphered by said deciphering means in sequential order; fourth reading means for reading data from said fourth storage means in reverse sequential order; and means for outputting data from said fourth reading means.
Claim 4
Dependent Claim
31 words
An apparatus for enciphered fascimile transmission according to claim 1 further comprising: means for encoding input data, said encoding means being disposed between said input means and said first storing means.
Claim 5
Dependent Claim
37 words
An apparatus for enciphered fascimile transmission according to claim 2 further comprising: means, disposed between said input means and said first storing means, for encoding input data; and means, coupled to said output means, for decoding data.
Claim 6
Dependent Claim
39 words
An apparatus for enciphered fascimile transmission according to claim 2, said receiving means including means for detecting a transmission error, and said transmitting means including means for retransmitting data when a transmission error is detected by said detecting means.
Claim 7
Independent Claim
137 words
An apparatus for enciphered fascimile transmission comprising: means for inputting data to be transmitted; first and second storing means, alternately coupled to said input means, for storing in sequential order said first and second blocks of inputted data, respectively; first and second reading means for reading in reverse sequential order said first and second blocks of data from said first and second storing means, respectively; first and second means for chain enciphering data read by said first and second reading means, respectively; third and fourth storing means for storing in sequential order data chain enciphered by said first and second enciphering means, respectively; third and fourth reading means for reading in reverse sequential order, data from said third and fourth storing means, respectively; and means for alternately transmitting data read by said third and fourth reading means.
Claim 8
Independent Claim
137 words
An apparatus for enciphered fascimile transmission comprising: means for inputting data to be transmitted; first and second storing means, alternately coupled to said input means, for storing in sequential order said first and second blocks of inputted data, respectively; first and second reading means for reading in reverse sequential order said first and second blocks of data from said first and second storing means, respectively; first and second means for chain enciphering data read by said first and second reading means, respectively; third and fourth storing means for storing in sequential order data chain enciphered by said first and second enciphering means, respectively; third and fourth reading means for reading in reverse sequential order, data from said third and fourth storing means, respectively; and means for alternately transmitting data read by said third and fourth reading means.
Claim 9
Dependent Claim
132 words
An apparatus for enciphered fascimile transmission according to claim 6, further comprising means for receiving transmitted data including; fifth and sixth means, alternately coupled to said receiving means, for storing sequentially first and second blocks of received data, respectively; fifth and sixth means for reading in reverse sequential order said first and second blocks of received data from said fifth and sixth storing means, respectively, first and second means for deciphering data read by said fifth and sixth reading means, respectively; seventh and eighth storing means for storing sequentially data deciphered by said first and second deciphering means respectively; seventh and eighth means for reading in reverse sequential order data stored in said seventh and eighth storage means respectively; and means for alternately outputting data from said seventh and eighth reading means.
Claim 10
Dependent Claim
41 words
An apparatus for enciphered fascimile transmission according to claim 6 further comprising: means for alternately coupling said first and second storing means to said input means; and means, disposed between said input means and said coupling means; for encoding input data.
Claim 11
Dependent Claim
73 words
An apparatus for enciphered fascimile transmission according to claim 7 further comprising: first means for alternately coupling said first and second storing means to said input means; and means, disposed between said input means and said first coupling means, for encoding input data; second means for alternately coupling said output means to said seventh and eighth reading means; and means, disposed between said second coupling means and said output means, for decoding data.
Claim 12
Dependent Claim
39 words
An apparatus for enciphered fascimile transmission according to claim 7, said receiving means including means for detecting a transmission error, and said transmitting means including means for retransmitting data when a transmission error is detected by said detecting means.
Claim 13
Independent Claim
110 words
An apparatus for reception of transmitted enciphered fascimile data comprising: means for storing a block of received data in sequential order; means for reading said block of received data from said received data storing means in reverse sequential order; means for deciphering said block of received data read by said received data reading means to form a block of deciphered data; means for storing said block of deciphered data deciphered by said deciphering means in sequential order; means for reading said block of deciphered data from said deciphered data storing means in reverse sequential order; and means for outputting said block of deciphered data from said deciphered data reading means.
Claim 14
Independent Claim
110 words
An apparatus for reception of transmitted enciphered fascimile data comprising: means for storing a block of received data in sequential order; means for reading said block of received data from said received data storing means in reverse sequential order; means for deciphering said block of received data read by said received data reading means to form a block of deciphered data; means for storing said block of deciphered data deciphered by said deciphering means in sequential order; means for reading said block of deciphered data from said deciphered data storing means in reverse sequential order; and means for outputting said block of deciphered data from said deciphered data reading means.
Claim 15
Independent Claim
148 words
A method for enciphered fascimile transmission of inputted data comprising the steps of: encoding the inputted data; grouping the inputted data into blocks of data; storing the inputted data in each block of data in a sequential order; reading the inputted data in each block of data, stored in the inputted data storing step, in reverse of the sequential order in which the inputted data in each block of data was stored; chain enciphering the inputted data read in the inputted data reading step; storing the enciphered data in each block of data in a sequential order; reading the enciphered data in each block of data, stored in the enciphered data storing step, in reverse of the sequential order in which the enciphered data in each block of data was stored; and transmitting the enciphered data in each block of data read in the enciphered data reading step.
Claim 16
Independent Claim
148 words
A method for enciphered fascimile transmission of inputted data comprising the steps of: encoding the inputted data; grouping the inputted data into blocks of data; storing the inputted data in each block of data in a sequential order; reading the inputted data in each block of data, stored in the inputted data storing step, in reverse of the sequential order in which the inputted data in each block of data was stored; chain enciphering the inputted data read in the inputted data reading step; storing the enciphered data in each block of data in a sequential order; reading the enciphered data in each block of data, stored in the enciphered data storing step, in reverse of the sequential order in which the enciphered data in each block of data was stored; and transmitting the enciphered data in each block of data read in the enciphered data reading step.
Claim 17
Dependent Claim
183 words
A method for enciphered fascimile transmission according to claim 12, further comprising the step of receiving enciphered data transmitted in the transmitting step, said step of receiving enciphered data including the steps of: grouping the received enciphered data into blocks of data; storing the received enciphered data in each block of data in a sequential order; reading the received enciphered data in each block of data, stored in the received enciphered data storing step, in reverse of the sequential order in which the received enciphered data in each block of data was stored; deciphering the received enciphered data in each block of data read in the received enciphered data reading step; storing the deciphered data in each block of data in a sequential order; reading the deciphered data in each block of data, stored in the deciphered data storing step, in reverse of the sequential order in which the deciphered data in each block of data was stored; decoding the data in each block of data read in the deciphered data reading step; and outputting the decoded data in each block of data.
Claim 18
Independent Claim
163 words
A method for receiving transmitted enciphered fascimile data comprising the steps of: grouping received enciphered data into blocks of enciphered data; storing the enciphered data in each block of enciphered data in a sequential order; reading the enciphered data in each block of enciphered data, stored in the enciphered data storing step, in reverse of the sequential order in which the enciphered data in each block of enciphered data was stored; deciphering the enciphered data in each block of enciphered data read in the enciphered data reading step to form a block of deciphered data corresponding to each block of enciphered data; storing the deciphered data in each block of deciphered data in a sequential order; reading the deciphered data in each block of deciphered data, stored in the deciphered data storing step, in reverse of the sequential order in which the deciphered data in each block of deciphered data was stored; outputting the deciphered data read in said deciphered data reading step.
Claim 19
Independent Claim
163 words
A method for receiving transmitted enciphered fascimile data comprising the steps of: grouping received enciphered data into blocks of enciphered data; storing the enciphered data in each block of enciphered data in a sequential order; reading the enciphered data in each block of enciphered data, stored in the enciphered data storing step, in reverse of the sequential order in which the enciphered data in each block of enciphered data was stored; deciphering the enciphered data in each block of enciphered data read in the enciphered data reading step to form a block of deciphered data corresponding to each block of enciphered data; storing the deciphered data in each block of deciphered data in a sequential order; reading the deciphered data in each block of deciphered data, stored in the deciphered data storing step, in reverse of the sequential order in which the deciphered data in each block of deciphered data was stored; outputting the deciphered data read in said deciphered data reading step.
References Cited (Backward Citations)
US4392021A
Cited
US4912761A
Cited
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