US7146501B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for encrypting and decrypting data using encrypting key contained in electronic watermark
Assignee: NEC Personal Computers Ltd
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Filing: 2002-01-24
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Granted: 2006-12-05
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Expires: 2022-01-24
Abstract
Abstract In encoder side, an electronic watermark generating device generates an electronic watermark which contains a encryption key. An electronic watermark inserting device inserts the electronic watermark containing the encryption key into a first portion of data. An encrypting device encrypts a second portion of the data with the encryption key. The first portion into which the watermark containing the encryption key has been inserted and the second portion which has been encrypted with the encryption key are combined by a switch and thereafter recorded on a record medium or transmitted to a network. In decoder side, the watermark containing the encryption key is extracted from the first portion and the encryption key is extracted from the watermark. The second portion is decrypted with the extracted encryption key.
Inventors
- 👤 Nobuyuki Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:17
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/00086; G11B20/0021; G11B20/00217; G11B20/00253; G11B20/00282; G11B20/00289; G11B20/00485; G11B20/00492; G11B20/00507; G11B20/00884; H; H04; H04L; H04L2209/00; H04L2209/60; H04L2209/608
Claims Analysis
Total Claims: 50
Claim 1
Independent Claim
136 words
An encrypting apparatus using an encryption key contained in an electronic watermark, said apparatus comprising: generating means for generating a first electronic watermark which contains a first encryption key; electronic watermark inserting means for inserting said first electronic watermark containing said first encryption key into a first portion of data; and encrypting means for encrypting a second portion of said data with said first encryption key, wherein said electronic watermark generating means generates an n-th electronic watermark which contains an n-th encryption key; where n is an integer larger than one, said electronic watermark inserting means inserts said n-th electronic watermark into n-th portion of said data before said encrypting means encrypts said n-th portion with an (n−1)-th encryption key, and said encrypting means encrypts an (n+1)-th portion of said data with said n-th encryption key.
Claim 2
Dependent Claim
136 words
An encrypting apparatus using an encryption key contained in an electronic watermark, said apparatus comprising: generating means for generating a first electronic watermark which contains a first encryption key; electronic watermark inserting means for inserting said first electronic watermark containing said first encryption key into a first portion of data; and encrypting means for encrypting a second portion of said data with said first encryption key, wherein said electronic watermark generating means generates an n-th electronic watermark which contains an n-th encryption key; where n is an integer larger than one, said electronic watermark inserting means inserts said n-th electronic watermark into n-th portion of said data before said encrypting means encrypts said n-th portion with an (n−1)-th encryption key, and said encrypting means encrypts an (n+1)-th portion of said data with said n-th encryption key.
Claim 3
Dependent Claim
18 words
The encrypting apparatus as set forth in claim 1 , further comprising: compressing means for compressing said data.
Claim 4
Dependent Claim
22 words
The encrypting apparatus as set forth in claim 2 , wherein said compressing means compresses said data before said data is encrypted.
Claim 5
Dependent Claim
25 words
The encrypting apparatus as set forth in claim 1 , wherein said data contain at least one of video data, audio data, and character data.
Claim 6
Dependent Claim
24 words
The encrypting apparatus as set forth in claim 1 , wherein said first portion and said second portion are output to the same medium.
Claim 7
Dependent Claim
30 words
The encrypting apparatus as set forth in claim 1 , wherein said second portion is output to a medium different from a medium to which said first portion is output.
Claim 8
Dependent Claim
17 words
The encrypting apparatus as set forth in claim 1 , wherein said first portion contains a commercial.
Claim 9
Dependent Claim
130 words
A decrypting apparatus using an encryption key contained in an electronic watermark, said apparatus comprising: electronic watermark detecting means for detecting an a first electronic watermark from a first portion of data; encryption key extracting means for extracting a first encryption key from said first electronic watermark; and decrypting means for decrypting a second portion of said data with said first encryption key, wherein said electronic watermark detecting means detects an n-th electronic watermark from an n-th portion of said data decrypted with an (n−1)-th encryption key by said decrypting means, where n is an integer larger than one, said encryption key extracting means extracts an n-th encryption key from said n-th electronic watermark, and said decrypting means decrypts an (n+1)-th portion of said data with said n-th encryption key.
Claim 10
Dependent Claim
130 words
A decrypting apparatus using an encryption key contained in an electronic watermark, said apparatus comprising: electronic watermark detecting means for detecting an a first electronic watermark from a first portion of data; encryption key extracting means for extracting a first encryption key from said first electronic watermark; and decrypting means for decrypting a second portion of said data with said first encryption key, wherein said electronic watermark detecting means detects an n-th electronic watermark from an n-th portion of said data decrypted with an (n−1)-th encryption key by said decrypting means, where n is an integer larger than one, said encryption key extracting means extracts an n-th encryption key from said n-th electronic watermark, and said decrypting means decrypts an (n+1)-th portion of said data with said n-th encryption key.
Claim 11
Dependent Claim
18 words
The decrypting apparatus as set forth in claim 8 , further comprising: expanding means for expanding said data.
Claim 12
Dependent Claim
22 words
The decrypting apparatus as set forth in claim 9 , wherein said expanding means expands said data after said data is decrypted.
Claim 13
Dependent Claim
25 words
The decrypting apparatus as set forth in claim 8 , wherein said data contain at least one of video data, audio data, and character data.
Claim 14
Dependent Claim
24 words
The decrypting apparatus as set forth in claim 8 , wherein said first portion and said second portion are input from the same medium.
Claim 15
Dependent Claim
30 words
The decrypting apparatus as set forth in claim 8 , wherein said second portion is input from a medium different from a medium from which said first portion is input.
Claim 16
Dependent Claim
17 words
The decrypting apparatus as set forth in claim 8 , wherein said first portion contains a commercial.
Claim 17
Dependent Claim
112 words
An encrypting method using an encryption key contained in an electronic watermark, said method comprising the steps of: generating a first electronic watermark which contains a first encryption key; inserting said first electronic watermark containing said first encryption key into a first portion of data; encrypting a second portion of said data with said first encryption key; generating an n-th electronic watermark which contains an n-th encryption key, where n is an integer larger than one; inserting said n-th electronic watermark into an n-th portion of said data before said n-th portion is encrypted with an (n−1)-th encryption key; and encrypting an (n+1)-th portion of said data with said n-th encryption key.
Claim 18
Dependent Claim
112 words
An encrypting method using an encryption key contained in an electronic watermark, said method comprising the steps of: generating a first electronic watermark which contains a first encryption key; inserting said first electronic watermark containing said first encryption key into a first portion of data; encrypting a second portion of said data with said first encryption key; generating an n-th electronic watermark which contains an n-th encryption key, where n is an integer larger than one; inserting said n-th electronic watermark into an n-th portion of said data before said n-th portion is encrypted with an (n−1)-th encryption key; and encrypting an (n+1)-th portion of said data with said n-th encryption key.
Claim 19
Dependent Claim
18 words
The encrypting method as set forth in claim 15 , further comprising the step of: compressing the data.
Claim 20
Dependent Claim
20 words
The encrypting method as set forth in claim 16 , wherein said data is compressed before said data is encrypted.
Claim 21
Dependent Claim
25 words
The encrypting method as set forth in claim 15 , wherein said data contain at least one of video data, audio data, and character data.
Claim 22
Dependent Claim
41 words
The encrypting method as set forth in claim 15 , further comprising the steps of: outputting said first portion to a medium; and outputting said second portion to the same medium as the medium to which said second portion is output.
Claim 23
Dependent Claim
41 words
The encrypting method as set forth in claim 15 , further comprising the steps of: outputting said first portion to a medium; and outputting said second portion to a medium different from the medium to which said first portion is output.
Claim 24
Dependent Claim
17 words
The encrypting method as set forth in claim 15 , wherein the first portion contains a commercial.
Claim 25
Dependent Claim
100 words
A decrypting method using an encryption key contained in an electronic watermark, said method comprising the steps of: detecting a first electronic watermark from a first portion of data; extracting a first encryption key from said first electronic watermark; decrypting a second portion of said data with said first encryption key; detecting an n-th electronic watermark from an n-th portion of said data decrypted with an (n−1)-th encryption key, where n is an integer larger than one; extracting an n-th encryption key from said n-th electronic watermark; and decrypting an (n+1)-th portion of said data with said n-th encryption key.
Claim 26
Dependent Claim
100 words
A decrypting method using an encryption key contained in an electronic watermark, said method comprising the steps of: detecting a first electronic watermark from a first portion of data; extracting a first encryption key from said first electronic watermark; decrypting a second portion of said data with said first encryption key; detecting an n-th electronic watermark from an n-th portion of said data decrypted with an (n−1)-th encryption key, where n is an integer larger than one; extracting an n-th encryption key from said n-th electronic watermark; and decrypting an (n+1)-th portion of said data with said n-th encryption key.
Claim 27
Dependent Claim
18 words
The decrypting method as set forth in claim 22 , further comprising the step of: expanding said data.
Claim 28
Dependent Claim
20 words
The decrypting method as set forth in claim 23 , wherein said data is expanded after said data is decrypted.
Claim 29
Dependent Claim
25 words
The decrypting method as set forth in claim 22 , wherein said data contain at least one of video data, audio data, and character data.
Claim 30
Dependent Claim
41 words
The decrypting method as set forth in claim 22 , further comprising the steps of: inputting said first portion from a medium; and inputting said second portion from the same medium as the medium from which said first portion is input.
Claim 31
Dependent Claim
41 words
The decrypting method as set forth in claim 22 , further comprising the steps of: inputting said first portion from a medium; and inputting said second portion from a medium different from the medium from which said first portion is input.
Claim 32
Dependent Claim
17 words
The decrypting method as set forth in claim 22 , wherein said first portion contains a commercial.
Claim 33
Dependent Claim
120 words
A computer program product embodied on a computer-readable medium and comprising code which, when executed, causes a computer to perform a method comprising the steps of: generating a first electronic watermark which contains a first encryption key; inserting said first electronic watermark containing said first encryption key into a first portion of data; encrypting a second portion of said data with said first encryption key; generating an n-th electronic watermark which contains an n-th encryption key, where n is an integer larger than one; inserting said n-th electronic watermark into an n-th portion of said data before said n-th portion is encrypted with an (n−1)-th encryption key; and encrypting an (n+1)-th portion of said data with said n-th encryption key.
Claim 34
Dependent Claim
120 words
A computer program product embodied on a computer-readable medium and comprising code which, when executed, causes a computer to perform a method comprising the steps of: generating a first electronic watermark which contains a first encryption key; inserting said first electronic watermark containing said first encryption key into a first portion of data; encrypting a second portion of said data with said first encryption key; generating an n-th electronic watermark which contains an n-th encryption key, where n is an integer larger than one; inserting said n-th electronic watermark into an n-th portion of said data before said n-th portion is encrypted with an (n−1)-th encryption key; and encrypting an (n+1)-th portion of said data with said n-th encryption key.
Claim 35
Dependent Claim
22 words
The computer program product as set forth in claim 29 , wherein said method further comprises the step of: compressing the data.
Claim 36
Dependent Claim
21 words
The computer program product as set forth in claim 30 , wherein said data is compressed before said data is encrypted.
Claim 37
Dependent Claim
26 words
The computer program product as set forth in claim 29 , wherein said data contain at least one of video data, audio data, and character data.
Claim 38
Dependent Claim
45 words
The computer program product as set forth in claim 29 , wherein said method further comprises the steps of: outputting said first portion to a medium; and outputting said second portion to the same medium as the medium to which said second portion is output.
Claim 39
Dependent Claim
45 words
The computer program product as set forth in claim 29 , wherein said method further comprises the steps of: outputting said first portion to a medium; and outputting said second portion to a medium different from the medium to which said first portion is output.
Claim 40
Dependent Claim
18 words
The computer program product as set forth in claim 29 , wherein the first portion contains a commercial.
Claim 41
Dependent Claim
108 words
A computer program product embodied on a computer-readable medium and comprising code which, when executed, causes a computer to perform a method comprising the steps of: detecting a first electronic watermark from a first portion of data; extracting a first encryption key from said first electronic watermark; decrypting a second portion of said data with said first encryption key; detecting an n-th electronic watermark from an n-th portion of said data decrypted with an (n−1)-th encryption key, where n is an integer larger than one; extracting an n-th encryption key from said n-th electronic watermark; and decrypting an (n+1)-th portion of said data with said n-th encryption key.
Claim 42
Dependent Claim
108 words
A computer program product embodied on a computer-readable medium and comprising code which, when executed, causes a computer to perform a method comprising the steps of: detecting a first electronic watermark from a first portion of data; extracting a first encryption key from said first electronic watermark; decrypting a second portion of said data with said first encryption key; detecting an n-th electronic watermark from an n-th portion of said data decrypted with an (n−1)-th encryption key, where n is an integer larger than one; extracting an n-th encryption key from said n-th electronic watermark; and decrypting an (n+1)-th portion of said data with said n-th encryption key.
Claim 43
Dependent Claim
22 words
The computer program product as set forth in claim 36 , wherein said method further comprises the step of: expanding said data.
Claim 44
Dependent Claim
21 words
The computer program product as set forth in claim 37 , wherein said data is expanded after said data is decrypted.
Claim 45
Dependent Claim
26 words
The computer program product as set forth in claim 36 , wherein said data contain at least one of video data, audio data, and character data.
Claim 46
Dependent Claim
45 words
The computer program product as set forth in claim 36 , wherein said method further comprises the steps of: inputting said first portion from a medium; and inputting said second portion from the same medium as the medium from which said first portion is input.
Claim 47
Dependent Claim
45 words
The computer program product as set forth in claim 36 , wherein said method further comprises the steps of: inputting said first portion from a medium; and inputting said second portion from a medium different from the medium from which said first portion is input.
Claim 48
Dependent Claim
18 words
The computer program product as set forth in claim 36 , wherein said first portion contains a commercial.
Claim 49
Dependent Claim
99 words
A computer readable medium on which data has been stored, said data comprising a data structure used for decrypting a subsequent portion of data based on a previous portion of data, said data structure comprising: a first portion into which a first electronic watermark which contains a first encryption key has been inserted; a second portion encrypted with said first encryption key; an n-th electronic watermark which contains an n-th encryption key has been inserted into an n-th portion, where n is an integer larger than one; said data has an (n+1)-th portion encrypted with said n-th encryption key.
Claim 50
Dependent Claim
99 words
A computer readable medium on which data has been stored, said data comprising a data structure used for decrypting a subsequent portion of data based on a previous portion of data, said data structure comprising: a first portion into which a first electronic watermark which contains a first encryption key has been inserted; a second portion encrypted with said first encryption key; an n-th electronic watermark which contains an n-th encryption key has been inserted into an n-th portion, where n is an integer larger than one; said data has an (n+1)-th portion encrypted with said n-th encryption key.
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