Efficient two party oblivious transfer using a leveled fully homomorphic encryption
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United States of America Patent
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Dec 19, 2017
Grant Date -
May 25, 2017
app pub date -
Nov 25, 2015
filing date -
Nov 25, 2015
priority date (Note) -
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Abstract
A querying node generates public keys, secret keys, and switch key matrices. A public key associated with a first level and the switch key matrices are sent to a receiving node. The receiving node generates a key-value table, mapping values to keys, and encodes the keys and values using a polynomial ring of a predetermined type. The querying node encodes using a polynomial ring of the same predetermined type, then encrypts a query, using a public key, and sends the query to the receiving node. The receiving node performs a homomorphic comparison of the encrypted, encoded query with each encoded key entry in the encoded key-value store to determine a comparison result. The receiving node sums the results for each of the value entries and returns the summed result to the querying node. The querying node decrypts and decodes the received result using the corresponding secret key.
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