Algorithm 2 Confusion Mechanism Decode Algorithm (CMA-D)

Require: Encoded user information Ensure: User information   Split coding information in order, which as $ID,se{x}^{{}^{\prime }},$   $\widehat{age},\widehat{f}\left(hobby\right),\widehat{f}\left(occupation\right),L{o}^{{}^{\prime }},L{a}^{{}^{\prime }},sensingdata,Time$   $Ke{y}_a=(\alpha ,\beta )$;   $Ke{y}_h=(\mu ,\nu )$;   $Ke{y}_o=({\mu }^{{}^{\prime }},{\nu }^{{}^{\prime }})$;   Matrix $P^{-1}$ and matrix $Q^{-1}$;   if $se{x}^{{}^{\prime }}$ = 01 then    sex←man;   else    Data does not exist;   end if   if $se{x}^{{}^{\prime }}$ = 02 then    sex←woman;   else    Data does not exist;   end if   $\overrightarrow{Lo}=\overrightarrow{L{o}^{\prime }}\times Q^{-1}$, $\overrightarrow{La}=\overrightarrow{L{a}^{\prime }}\times P^{-1}$;   $age\leftarrow (\widehat{age}-\beta )÷\alpha$;   $fun\left(hobby\right)=\lambda \times (\widehat{f}\left(hobby\right)-\nu )mod\left(26\right)$;   $fun\left(occupation\right)=\gamma \times (\widehat{f}\left(occupation\right)-{\nu }^{{}^{\prime }})mod\left(26\right)$;