EP1008989A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for processing information, and recording medium
Assignee: Sony Corp
•
Filing: 1999-12-08
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Granted: —
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Expires: 2019-12-08
Abstract
Abstract A technique for updating a master key while maintaining interoperability is provided. An encrypted data memory stores an encrypted master key obtained by encrypting a master key using a device key stored in a device key memory. A master key decoder produces a master key by decoding the encrypted master key stored in the encrypted data memory using the device key stored in the device key memory. From the above-described master key, a master key of an older generation can be produced. More specifically, a master key of an older generation can be produced by applying a predetermined unidirectional function to the former master key.
Inventors
- 👤 Tomoyuki Intellectual Property Dept. Asano
- 👤 Yoshitomo Intellectual Property Dept. Osawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 10:25
CPC Classifications
G; G06; G06F; G06F21/00; G06F21/60; G06F21/62; G06F21/6209; G11; G11B; G11B20/00; G11B20/00086; G11B20/00188; G11B20/00195; G11B20/0021; G11B20/00217; G11B20/00246; G11B20/00253; G11B20/00297; G11B20/00304; G11B20/00333; G06F2211/00; G06F2211/007; G06F2221/00; G06F2221/21; G06F2221/2107
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
65 words
An information processing apparatus comprising: acquisition means for acquiring a first key from the
outside, said first key being capable of producing a first
key of a generation -older than the generation of said first
key acquired from the outside; and updating means for updating the content of first key
storage means storing said first key with said first key
acquired via said acquisition means.
Claim 2
Dependent Claim
49 words
An information processing apparatus according to
Claim 1, wherein if the generation of said first key
acquired via said acquisition means is later than the
generation of said first key stored in said first key
storage means, said updating means updates the content of
said first key storage means.
Claim 3
Dependent Claim
32 words
An information processing apparatus according to
Claim 1, wherein said updating means replaces the first key
stored in said first key storage means with the first key
acquired via said acquisition means.
Claim 4
Dependent Claim
15 words
An information processing apparatus according to
Claim 1, further comprising said first key storage means.
Claim 5
Dependent Claim
53 words
An information processing apparatus according to
Claim 1, wherein said first key storage means stores a first
encrypted key obtained by encrypting said first key in
accordance to a second key, and wherein said information processing apparatus
further comprises decoding means for decoding said first
encrypted key in accordance with said second key.
Claim 6
Dependent Claim
19 words
An information processing apparatus according to
Claim 5, further comprising second key storage means for
storing said second key.
Claim 7
Dependent Claim
46 words
An information processing apparatus according to
Claim 1, further comprising production means for producing,
from the first key stored in the first key storage means, a
first key of a generation older than the generation of said
first key stored in the first key storage means.
Claim 8
Dependent Claim
50 words
An information processing apparatus according to
Claim 7, wherein said production means produces a first key
of a generation older than the generation of said first key
stored in said first key storage means by applying a
predetermined function to said first key stored in said
first key storage means.
Claim 9
Dependent Claim
27 words
An information processing apparatus according to
Claim 1, wherein said acquisition means reads said first key
from a recording medium on which said first key is recorded.
Claim 10
Dependent Claim
48 words
An information processing apparatus according to
Claim 9, wherein a plurality of said first keys are recorded
on said recording medium, and wherein said acquisition means reads a particular
first key of said plurality of first keys, said particular
first key being assigned to said information processing.
apparatus.
Claim 11
Dependent Claim
28 words
An information processing apparatus according to
Claim 1, further comprising encryption means for encrypting
data in accordance with the first key stored in said first
key storage means.
Claim 12
Dependent Claim
72 words
An information processing apparatus according to
Claim 1, further comprising: comparison means for comparing the generation of the
first key stored in said first key storage means with a
particular generation of a first key, said particular
generation being indicated by generation information
recorded on a recording medium; and recording control means for controlling recording of
data onto said recording medium in accordance with a
comparison result given by said comparison means.
Claim 13
Dependent Claim
55 words
An information processing apparatus according to
Claim 12, wherein, only when the generation of the first key
stored in said first key storage means is equal to or later
than the generation indicated by the generation information
recorded on said recording medium, said recording control
means allows data to be recorded on said recording medium.
Claim 14
Dependent Claim
47 words
An information processing apparatus according to
Claim 12, further comprising encryption means for encrypting
data in accordance with the first key stored in said first
key storage means and outputting the resultant encrypted
data, wherein said recording control means records said
encrypted data onto said recording medium.
Claim 15
Dependent Claim
38 words
An information processing apparatus according to
Claim 14, wherein said recording control means also records,
onto said recording medium, the generation information
indicating the generation of the first key used by said
encryption means to encrypt the data.
Claim 16
Dependent Claim
29 words
An information processing apparatus according to
Claim 1, further comprising decoding means for decoding
encrypted data in accordance with the first key stored in
said first key storage means.
Claim 17
Dependent Claim
72 words
An information processing apparatus according to
Claim 1, further comprising: comparison means for comparing the generation of the
first key stored in said first key storage means with a
particular generation of a first key, said particular
generation being indicated by generation information
recorded on a recording medium; and reproducing control means for controlling reproducing
of data from said recording medium, in accordance with a
comparison result given by said comparison means.
Claim 18
Dependent Claim
55 words
An information processing apparatus according to
Claim 17, wherein only when the generation of the first key
stored in said first key storage means is equal to or later
than the generation indicated by the generation information
recorded on said recording medium, said reproducing control
means allows data to be reproduced from said recording
medium.
Claim 19
Dependent Claim
45 words
An information processing apparatus according to
Claim 17, wherein encrypted data is recorded on said
recording medium, and wherein said information processing apparatus
further comprises decoding means for decoding said encrypted
data in accordance with the first key stored in said first
key storage means.
Claim 20
Dependent Claim
119 words
An information processing apparatus according to
Claim 1, further comprising: first comparison means for comparing the generation of
the first key stored in said first key storage means with a
generation indicated by first generation information stored
on a recording medium on which encrypted data obtained by
encrypting data according to a first key and the first
generation information indicating the generation of the
first key used to encrypt said data are recorded; reproducing control means for controlling reproducing
of encrypted data from said recording medium, in accordance
with a comparison result given by said first comparison
means; and decoding means for decoding said encrypted data in
accordance with the first key stored in said first key
storage means.
Claim 21
Dependent Claim
56 words
An information processing apparatus according to
Claim 20, wherein only when the generation of the first key
stored in said first key storage means is equal to or later
than the generation indicated by the first generation
information recorded on said recording medium, said
reproducing control means allows data to be reproduced from
said recording medium.
Claim 22
Dependent Claim
96 words
An information processing apparatus according to
Claim 20, wherein second generation information indicating
the generation of a particular first key has been recorded,
in advance, on said recording medium, said information processing apparatus further
comprising second comparison means for comparing the
generation indicated by the second generation information
recorded on said recording medium with the generation of the
first key stored in said first key storage means, and wherein said reproducing control means controls
reproducing of said encrypted data from said recording
medium, in accordance with comparison results given by said
first and second comparison means.
Claim 23
Dependent Claim
97 words
An information processing apparatus according to
Claim 20, further comprising production means for producing
a first key in such a manner that, when the generation of
the first key stored in said first key storage means is
later than a generation indicated by first generation
information stored on said recording medium, said production
means produces a first key of the generation indicated by
said first generation information from the first key stored
in said first key storage means, wherein said decoding means decodes said encrypted data
in accordance with the first key produced by said production
means.
Claim 24
Dependent Claim
76 words
An information processing apparatus according to
Claim 1, further comprising: production means for producing, from the first key
stored in said first key storage means, a first key of a
particular generation indicated by generation information
recorded on a recording medium; encrypting means for encrypting data in accordance with
the first key produced by said production means and
outputting the resultant encrypted data; and recording control means for recording said encrypted
data onto said recording medium.
Claim 25
Dependent Claim
75 words
An information processing apparatus according to
Claim 1, further comprising: production means for producing, from the first key
stored in said first key storage means, a first key of a
particular generation indicated by generation information
recorded on a recording medium; reproducing control means for reproducing data recorded
on said recording medium; and decoding means for decoding the data reproduced from
said recording medium, in accordance with the first key
produced by said production means.
Claim 26
Dependent Claim
55 words
An information processing method comprising the
steps of: acquiring a key from the outside, said key being
capable of producing a key of a generation older than the
generation of said key acquired from the outside; and updating the content of key storage means storing said
key with said key acquired via said acquisition means.
Claim 27
Dependent Claim
67 words
A recording means storing a program executed by a
computer to perform a process, said process comprising the
steps of: acquiring a key from the outside, said key being
capable of producing a key of a generation older than the
generation of said key acquired from the outside; and updating the content of key storage means storing said
key with said key acquired via said acquisition means.
Claim 28
Dependent Claim
61 words
A recording medium on which encrypted data obtained
by encrypting data according to a first key is recorded,
said recording medium being characterized in that: generation information is recorded on said recording
medium, said generation information indicating the
generation of a first key capable of producing a first key
of a generation older than the generation indicated by said
generation information.
Claim 29
Dependent Claim
17 words
A recording medium according to Claim 28, wherein
said generation information is recorded in a read-only area.
Claim 30
Dependent Claim
27 words
A recording medium according to Claim 28, wherein
said first key and generation information indicating the
generation of said first key are recorded on said recording
medium.
Claim 31
Dependent Claim
19 words
A recording medium according to Claim 30, wherein
said first key is encrypted in accordance with a second key.
Claim 32
Dependent Claim
17 words
A recording medium according to Claim 30, wherein
said first key is recorded in a read-only area.
Claim 33
Dependent Claim
31 words
A recording medium according to Claim 28, wherein a
plurality of first keys and generation information
indicating the generations of said plurality of first keys
are recorded on said recording medium.
References Cited (Backward Citations)
No citation records indexed.
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