A Privacy-Preserving Framework Using Homomorphic Encryption for Smart Metering Systems

. 2023 May 14;23(10):4746. doi: 10.3390/s23104746

Algorithm 3 HE Decryption Algorithm for Scenario 3

1:
Input $p k$ : the target public key for the new ciphertexts after converted from an MPC protocol
2:
Input $s k$ : the target secret key for the decryptor
3:
Input N: the number of the households
4:
Input H: the households array, each household keeping its secret key
5:
Input $d e c r y p t o r$ : the object that performs the decryption
6:
for $i n d e x = 1, 2, \dots, N$ do
7:
$c^{*} \leftarrow c i p h e r t e x t s [i n d e x]$
8:
$c^{* *} \leftarrow S w i t c h K e y V i a M P C (p a r a m s, p k, c^{*}, H)$
9:
$d a t a \leftarrow d e c r y p t (c^{* *}, d e c r y p t o r, s k)$
10:
push $d a t a$ into $p l a i n t e x t s$ array
11:
end for
12:
Output $p l a i n t e x t s$ array