Yeheskel Lapid

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A severe problem in the processing of encrypted data is that very often, in order to perform arithmetic operations on the data, one has to convert the data back to its nonencrypted origin before performing the required operations. This paper addresses the issue of processing data that have been encrypted while the data are in an encrypted mode. It develops(More)
Dr. Ahituv is a Visiting Associate Professor of Information Science at The Claremont Graduate School. He has been a Senior Lecturer in Information Systems with the Faculty of Management since 1981. He has also taught at New York University, the University of British Columbia, the University of Calgary, and the Technion Israel lnstitute of Technology. He(More)
The paper discusses problems arising from the 'abuse' of statistical databases by retrieving private information on individuals. The paper first demonstrates how such retrieval is made possible. It then provides a general algorithm that describes the retrieval procedures. Several protective measures are reviewed and criticized. Enhancements to those(More)
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