08930686 is referenced by 1 patents and cites 6 patents.

A mechanism is provided which allows to de-duplicate encrypted data such that the de-duplication ratio for encrypted data is similar to the de-duplication ration of the corresponding un-encrypted data and the purpose of encryption is not obfuscated, i.e. only the originator of the data (the client) can decrypt—and hence read—the data. This is achieved by interwoven the de-duplication algorithm with the encryption algorithm in a way that the data are encrypted with a key that is generated from the unencrypted data. Afterwards, that key is itself encrypted with an encryption key being private to a particular client. Due to the fact that the private key is not effecting the encrypted data stream, it can still be de-duplicated efficiently.

Title
Deduplication of encrypted data
Application Number
13/502463
Publication Number
8930686 (B2)
Application Date
October 25, 2010
Publication Date
January 6, 2015
Inventor
Stefan Letz
Boeblingen
DE
Oliver Augenstein
Weil i.Schoenbuch
DE
Agent
Jeffrey S LaBaw
Stephen J Walder Jr
Francis Lammes
Assignee
International Business Machines Corporation
NY, US
IPC
G06F 21/60
G06F 11/14
H04L 29/06
View Original Source