International Business Machines Corporation

Chris P Vanden Berghe

Tadeusz J Pietraszek

Dieter M Sommer

Jan Leonhard Camenisch

The invention relates to a method for checking for the presence of control statements in a data value, comprising providing at least one first data value () from a trustworthy source (), receiving at least one second data value () from an untrustworthy source () and marking the second data value () as untrustworthy, performing a computation on the first and second data value () resulting in a third data value () and marking all parts () of the third data value (), which are derived from the second data value (), as untrustworthy, and checking the parts () of the third data value () marked as untrustworthy for the presence of control statements. The invention further relates to a computer arrangement, a computer program, and a computer program product adapted to perform a method in accordance with the invention.

Method, computer arrangement, computer program and computer program product for checking for the presence of control statements in a data value

A computer implemented method for performing a privacy enhanced comparison of a plurality of data sets includes allocating a private encryption key to each of the data sets; performing an encryption operation for each of the data sets, the encryption operation comprising generating a commutatively encrypted data set of the respective data set, wherein the commutatively encrypted data sets are generated by successively applying a keyed commutative encryption function on the respective data set with the private encryption key of the respective data set itself and with the private encryption keys of the other data sets; and comparing the commutatively encrypted data sets.

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Hong Kong, China

Chris P Vanden Berghe