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Prepare-and-Send Quantum Fully Homomorphic Encryption: Difference between revisions
Prepare-and-Send Quantum Fully Homomorphic Encryption (edit)
Revision as of 09:10, 11 July 2019
, 11 July 2019→Outline
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*'''Recryption (QFHE.Rec())''' Server recrypts pad key of the qubit with the same public key that encrypts the corrected output state i.e. the one used for the corresponding gadget. Then, he updates the encrypted pad key according to the T Gate (similar to what is done for the Clifford Gate), Client’s encrypted measurement outcomes and Server’s (his) measurement outcomes. | *'''Recryption (QFHE.Rec())''' Server recrypts pad key of the qubit with the same public key that encrypts the corrected output state i.e. the one used for the corresponding gadget. Then, he updates the encrypted pad key according to the T Gate (similar to what is done for the Clifford Gate), Client’s encrypted measurement outcomes and Server’s (his) measurement outcomes. | ||
The server performs all the Clifford and T gates in the circuit following the respective procedure given above. Finally, he is left with the one time padded quantum output of the computation together with the required classical pad key encrypted with the public key of the gadget used for the last T gate, the last public key in the set. The server sends both the quantum state and classical encryptions to the Client. | The server performs all the Clifford and T gates in the circuit following the respective procedure given above. Finally, he is left with the one time padded quantum output of the computation together with the required classical pad key encrypted with the public key of the gadget used for the last T gate, the last public key in the set. The server sends both the quantum state and classical encryptions to the Client. | ||
'''Decryption''' The Client uses the last secret key in the set, which was not used to create any gadget (Gadgets used 0-(L-1) secret keys only) and decrypts sent encryptions to obtain the pad key. The pad key thus obtained determines the Pauli operations on the sent quantum state to obtain the final and correct outcome of the computation. The client performs the required operations on individual qubits of the quantum state and gets the output of his computation. | *'''Decryption (QFHE.Dec())''' The Client uses the last secret key in the set, which was not used to create any gadget (Gadgets used 0-(L-1) secret keys only) and decrypts sent encryptions to obtain the pad key. The pad key thus obtained determines the Pauli operations on the sent quantum state to obtain the final and correct outcome of the computation. The client performs the required operations on individual qubits of the quantum state and gets the output of his computation. | ||
==Requirements== | ==Requirements== | ||