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

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

Algorithm 4 Summation algorithm for ciphertexts.

1:
Input $c i p h e r t e x t s$ : the ciphertexts array transferred from the service provider
2:
Input $e v a l u a t o r$ : the object that performs homomorphic computations
3:
for $i n d e x = 1, 2, \dots, N$ do
4:
$c \leftarrow c i p h e r t e x t s [i n d e x]$
5:
$e v a l u a t o r . s u m E a c h E l e m e n t (c)$
6:
end for
7:
Output $c i p h e r t e x t s$ back to the service provider