Off-loading data re-encryption in encrypted data management...

Details Off-loading data re-encryption in encrypted data management... Off-loading data re-encryption in encrypted data management...

2004-10-29

2008-11-18

Zand, Kambiz (Department: 2134)

Cryptography

Key management

Key distribution

C380S028000, C380S030000, C380S045000, C380S281000, C380S283000, C380S284000, C380S285000, C380S286000

Reexamination Certificate

active

07454021

ABSTRACT:
Described is a solution for maintaining the security of encrypted data despite a compromised private key by using a re-encryption process that does not require decryption of the encrypted data. The compromised private key is re-encrypted using a new public key as is the encrypted symmetric key which the compromised private key can decrypt. When a decrypted version of the encrypted data is requested, the private key corresponding to the new public key decrypts both the encrypted version of the compromised private key and the re-encrypted version of the symmetric key resulting in the unencrypted compromised private key and the previously encrypted version of the symmetric key, which when decrypted using the compromised private key decrypts the encrypted data. The unencrypted symmetric key can then be encrypted using the new public key any encrypted compromised private key can be deleted.

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patent: WO 02060118 (2002-08-01), None
RSA Laboratories's Frequently Asked Questions About Today's Cryptography, 2000, Version 4.1, 4.1.3.7.

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