US Patent No: 8,150,038

Number of patents in Portfolio can not be more than 2000

Revocation of a system administrator in an encrypted file system

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ALSO PUBLISHED AS: 20090116649
ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

A method of securely storing electronic information includes a step in which target electronically stored information is encrypted with a first encryption key and then partitioned into a first set of encrypted ESI partitions a subset of which is able to reconstruct the unpartitioned encrypted ESI. This first set of encrypted ESI partitions is then encrypted with a first set of user encryption keys to form a first set of user-associated encrypted ESI partitions that are made available to a first set of users. When access to the target electronically stored information is changed, the target electronically stored information is accessed and then re-encrypted with a second encryption key to form a second encrypted ESI. This second encrypted ESI is then partitioned and distributed to a second set of users.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ORACLE AMERICA, INC.SANTA CLARA, CA1481
SUN MICROSYSTEMS, INC.SANTA CLARA, CA9061

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Perlman, Radia Acton, MA 9 417

Cited Art

Patent Info (Count) # Cites Year
 
SUN MICROSYSTEMS, INC. (24)
6,389,532 Method and apparatus for using digital signatures to filter packets in a network 61 1998
6,173,400 Methods and systems for establishing a shared secret using an authentication token 71 1998
6,230,266 Authentication system and process 74 1999
6,510,523 Method and system for providing limited access privileges with an untrusted terminal 79 1999
6,883,100 Method and system for dynamic issuance of group certificates 18 1999
7,213,262 Method and system for proving membership in a nested group using chains of credentials 10 1999
6,363,480 Ephemeral decryptability 54 1999
6,263,434 Signed group criteria 18 1999
6,912,656 Method and apparatus for sending encrypted electronic mail through a distribution list exploder 14 1999
6,804,779 Hierarchical watermarking of content that is distributed via a network 33 2000
6,546,486 Content screening with end-to-end encryption within a firewall 7 2000
6,560,705 Content screening with end-to-end encryption prior to reaching a destination 9 2000
6,636,838 Content screening with end-to-end encryption 18 2000
7,178,021 Method and apparatus for using non-secure file servers for secure information storage 17 2000
7,054,905 Replacing an email attachment with an address specifying where the attachment is stored 61 2000
7,058,798 Method ans system for pro-active credential refreshing 14 2000
6,996,712 Data authentication system employing encrypted integrity blocks 17 2000
6,975,729 Method and apparatus for facilitating use of a pre-shared secret key with identity hiding 4 2000
2002/0136,410 Method and apparatus for extinguishing ephemeral keys 23 2001
7,016,499 Secure ephemeral decryptability 8 2001
2002/0191,797 Secure ephemeral decryptability 6 2001
2003/0115,154 System and method for facilitating operator authentication 6 2001
7,792,300 Method and apparatus for re-encrypting data in a transaction-based secure storage system 2 2003
2007/0245,410 Method and apparatus for securely forgetting secrets 6 2006
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (4)
5,261,002 Method of issuance and revocation of certificates of authenticity used in public key networks and other systems 141 1992
5,351,295 Secure method of neighbor discovery over a multiaccess medium 30 1993
5,483,598 Message encryption using a hash function 38 1993
5,475,763 Method of deriving a per-message signature for a DSS or El Gamal encryption system 22 1994
 
EMC CORPORATION (2)
5,901,227 Method and apparatus for implementing partial and complete optional key escrow 73 1996
5,892,828 User presence verification with single password across applications 53 1996
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
7,778,417 System and method for managing encrypted content using logical partitions 4 2005
2008/0130,890 ENHANCED DATA SECURITY WITH REDUNDANT INCLUSIVE DATA ENCRYPTION SEGMENTS 2 2006
 
GUARDIAN DATA STORAGE, LLC (1)
8,006,280 Security system for generating keys from access rules in a decentralized manner and methods therefor 5 2002
 
INTEL CORPORATION (1)
2005/0108,534 Providing services to an open platform implementing subscriber identity module (SIM) capabilities 8 2003
 
MICRON TECHNOLOGY, INC. (1)
7,370,166 Secure portable storage device 14 2005

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Maintenance Fees

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