Homomorphic evaluation including key switching, modulus switching, and dynamic noise management
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United States of America Patent
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Mar 28, 2017
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app pub date -
Jan 28, 2016
filing date -
Feb 17, 2012
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Abstract
Homomorphic evaluation of a function is performed on input ciphertext(s), which were encrypted using a public key of an encryption scheme that also includes multiple secret keys. Each input ciphertext includes multiple real numbers that are kept with finite precision. Performing the homomorphic evaluation of the function includes performing operation(s). Performing each of one or more operations includes the following. A key-switching transformation is performed on selected ciphertext(s), including converting a first version of a selected ciphertext with respect to a first of the secret keys and with some number r bits of precision to a second version of the selected ciphertext with respect to a second of the secret keys and with some other number r′ bits of precision, r′>r. Each key switching transformation is performed prior to or after the operation(s) are evaluated. Results of the operation(s) are output.
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