Avrim Louis Blum, Age 5841 E 8Th St APT 3504, Chicago, IL 60605

2006020, Sep 7, 2006

Mar 1, 2005

11/069116

Cynthia Dwork - San Francisco CA, US
Frank McSherry - San Francisco CA, US
Yaacov Nissim Kobliner - Beer-Sheva, IL
Avrim Blum - Pittsburgh PA, US

Microsoft Corporation - Redmond WA

G06F 15/18

706012000, 706045000

A database has a plurality of entries and a plurality of attributes common to each entry, where each entry corresponds to an individual. A query is received from a querying entity query and is passed to the database, and an answer is received in response. An amount of noise is generated and added to the answer to result in an obscured answer, and the obscured answer is returned to the querying entity. The noise is normally distributed around zero with a particular variance. The variance R may be determined in accordance with R>8 T log(T/δ)/ε, where T is the permitted number of queries T, δ is the utter failure probability, and ε is the largest admissible increase in confidence. Thus, a level of protection of privacy is provided to each individual represented within the database. Example noise generation techniques, systems, and methods may be used for privacy preservation in such areas as k means, principal component analysis, statistical query learning models, and perceptron algorithms.