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This figure is made with Tikz package, I need suggestions to make font more bigger and more readable. I tried many solutions such as Large but still not able to increase the font more clear. My advisor told me to use the spaces in the image attached. Any suggestions to make the font more clear and bigger ??

                documentclass[tikz,border=3.14mm]{standalone}

           usetikzlibrary{positioning,calc,arrows.meta}





  begin{document}



begin{tikzpicture}[o-o/.style={{Circle[open]}-{Circle[open]}}, every node/.append style={font=LARGE}]



node (A) at (-8.5,+1){};

node (B) at (-8.5,-15){};

draw[-] (A)--(B);





node (C) at (-7.1,+1){};

node (D) at (-7.1,-15){};

draw[-] (C)--(D);



node (A) at (-7.8,-1.3){};

node (B) at (-7.8,-15){};

draw[->,green] (A)--(B);









node[xshift=-2.7cm] (a) {Largetextcolor{red}{$v_1$ generate a temporary key pair list} };







draw[->,cyan] ([yshift=.3cm,xshift=4cm]a.east) --+ (4,0) node[black,midway,above=.1cm] {Large $PK^{1}_{v_{1}}$};





draw[<-,cyan] ([yshift=-.1cm,xshift=4cm]a.east) --+ (4,0) node[text width=4cm,black,midway,below=.1cm] {Large$mathcal{T}_{1}= M_{1} || Sh_{R_{1}}$  };



node[right=10.6 of a,yellow!70!black, yshift=-.7cm,xshift=1.4cm] (b) 

 {Largetextcolor{black}{$R_1$}};





node[right=0.01 of b] {

    %LARGE

    Large

    begin{tabular}{l}

        Generates: $M_1 = {PK^{1}_{v_{1}}, (t_1, Tag_{R_{1})}}$ \

        Computes $mathrm{Sh}_{R_1}(M_1)$

    end{tabular}

};





begin{scope}[yshift=-3cm]





node[xshift=-2.2cm] (a) {

    %LARGE

    Large

    begin{tabular}{p{9cm}}

    textcolor{red}{ Run the PoW algorithm to get ($S_{mathcal{T}_{1}})$} \

     $L_{R_{1}}=(mathcal{T}_{1}||S_{mathcal{T}_{1}}||Pk^{2}_{v_{1}} ) || sigma_{Pr^{1}_{v_{1}}}(mathcal{T}_{1}, S_{mathcal{T}_{1}}, Pk^{2}_{v_{1}})$

    end{tabular}



};





draw[->,cyan] ([yshift=.3cm,xshift=3cm]a.east) --+ (4,0) node[black,midway,above=.1cm] {Large $mathrm{L}_{R_1}$};





draw[<-,cyan] ([yshift=-.1cm,xshift=1.5cm]a.east) --+ (7,0) node[text width=7.5cm,black,midway,below=.1cm] {Large $mathcal{T}_{2}= M_{2} || Sh_{R_{2}}(M_{1})|| Sh_{R_{2}}(M_{2} )  $  };





node[right=9.4 of a,yellow!70!black, yshift=-.7cm,xshift=1.4cm] (b) {Largetextcolor{black}{$R_2$}};













    node[right=0.01 of b] (c) {

        Large

        begin{tabular}{l}

         Verifies $mathrm{L}_{R_1}$ and signature shares\

         Verifies $S_{mathcal{T}_{1}}$ \



         Generates $M_{2}={PK^{2}_{v_{1}} || (t_{1}, Tag_{R_{1}}) || (t_{2}, Tag_{R_{2}})}$   \

         Computes $Sh_{R_{2}}(M_{1})$ \



         Computes $Sh_{R_{2}}(M_{2})$\

        end{tabular}

    };



end{scope}



 draw[o-o,dashed] (-7,-1.8) -- (30,-1.8);









    draw[o-o,dashed] (-7,-5.6) -- (30,-5.6);





begin{scope}[yshift=-7.5cm]



node[xshift=-2.2cm] (a) {

    %LARGE

    Large

    begin{tabular}{p{9cm}}

    textcolor{red}{ Run the PoW algorithm to get ($S_{mathcal{T}_{2}})$} \

     $L_{R_{2}}=({mathcal{T}_{2}||S_{mathcal{T}_{2}}|| PK^{3}_{v_{1}} ) || sigma_{SK^{1}_{v_{1}}}(mathcal{T}_{2},  S_{mathcal{T}_{2}}, PK^{3}_{v_{1}}}) $

    end{tabular}



};





draw[->,cyan] ([yshift=.3cm,xshift=3cm]a.east) --+ (4,0) node[black,midway,above=.1cm] {Large $mathrm{L}_{R_2}$};





draw[<-,cyan] ([yshift=-.1cm,xshift=1cm]a.east) --+ (9,0) node[text width=9.5cm,black,midway,below=.1cm] {Large $mathcal{T}_{3}= {M}_{1} || sigma({M_{1}}) || M_{3} ||Sh_{R_{3}}(M_{2})  || Sh_{R_{3}}(M_{3} )$};





node[right=9.4 of a,yellow!70!black, yshift=-.7cm,xshift=1.4cm] (b) {Largetextcolor{black}{$R_3$}};















    node[right=0.01 of b] (c) {

        Large

        begin{tabular}{l}

         Verifies $mathrm{L}_{R_2}$ and signature shares \

         Verifies $S_{mathcal{T}_{2}}$ \

         Computes $Sh_{R_{3}}(M_{1})$ \

         Computes $sigma(M_{1})$ \

         Generates $M_{3}={PK^{3}_{v_{1}} || (t_{1}, Tag_{R_{1}}) || (t_{2}, Tag_{R_{2}} || (t_{3}, Tag_{R_{3}})}$ \

         Computes $Sh_{R_{3}}(M_{2})$\

         Computes $Sh_{R_{3}}(M_{3})$\

        end{tabular}

    };



end{scope}











draw[o-o,dashed] (-7,-10.7) -- (30,-10.7);





begin{scope}[yshift=-12.5cm]





node[xshift=-2.2cm] (a) {

    %LARGE

    Large

    begin{tabular}{p{9cm}}

    textcolor{red}{ Run the PoW algorithm to get ($S_{mathcal{T}_{3}}$)} \



     $L_{R_{3}}=({mathcal{T}_{3}||S_{mathcal{T}_{3}}|| PK^{4}_{v_{1}} ) || sigma_{SK^{3}_{v_{1}}}(mathcal{T}_{3}, S_{mathcal{T}_{3}}, PK^{4}_{v_{1}}}) $

    end{tabular}



};















draw[->,cyan] ([yshift=.3cm,xshift=3cm]a.east) --+ (4,0) node[black,midway,above=.1cm] {Large $mathrm{L}_{R_3}$};





draw[<-,cyan] ([yshift=-.1cm,xshift=1cm]a.east) --+ (9,0) node[text width=9.5cm,black,midway,below=.1cm] {Large $mathcal{T}_{4}= {M}_{2} || sigma({M_{2}}) || M_{4}||Sh_{R_{4}}(M_{3})  || Sh_{R_{4}}(M_{4} )$  };













node[right=9.4 of a,yellow!70!black, yshift=-.7cm,xshift=1.4cm] (b) {Largetextcolor{black}{$R_4$}};











    node[right=0.01 of b] (c) {

        Large

        begin{tabular}{l}

         Verifies $mathrm{L}_{R_3}$ and signature shares \

     Verifies $S_{mathcal{T}_{3}}$ \

     Computes $Sh_{R_{4}}(M_{2})$ \

     Computes $sigma({M_{{2}}})$ \

     Generates  $M_{4}={PK^{4}_{v_{1}} || (t_{1}, Tag_{R_{1}}) || (t_{2}, Tag_{R_{2}} ) || (t_{3}, Tag_{R_{3}} || (t_{4}, Tag_{R_{4}})}$ \

     Computes $Sh_{R_{4}}(M_{3})$ \

     Computes $Sh_{R_{4}}(M_{4})$\

        end{tabular}

    };



end{scope}









  end{tikzpicture}

   end{document}

like this?

• i would write your image as table.


• 
  

  the largest font size, which enable to write table (or your image) into A4 page with margins=15mm and in the landscape orientation is large if you can break long equation into two line

  
  
  

  documentclass{article}
  
  usepackage[landscape,margin=15mm]{geometry}
  
  usepackage{tikz}
  
   usetikzlibrary{arrows.meta, positioning}
  
  
  
  usepackage{array, arydshln}
  
  newcommandppbb{path picture bounding box}
  
  usepackage{mathtools}
  
  usepackage{enumitem}
  
  
  
  begin{document}
  
  
  
  begingroup
  
      large
  
      setlist[itemize]{nosep,label=,leftmargin=*,before=vspace{1ex},after=vspace{-2ex}}
  
  tikzset{base/.style = {text=black, inner xsep=3mm, inner ysep=2mm},
  
           boxA/.style = {name=A,
  
                          base,path picture={%
  
                          draw[semithick,cyan,-{Straight Barb[length=0pt 3]}]
  
                          ([yshift=1mm]ppbb.south west) -- ([yshift=1mm]ppbb.south east);
  
                                          }
  
                          },
  
           boxB/.style = {base,text=black, inner xsep=2mm,
  
                          path picture={%
  
                          draw[semithick,cyan,-{Straight Barb[length=0pt 3]}]
  
                          ([yshift=-1mm]ppbb.north east) -- ([yshift=-1mm]ppbb.north west);
  
                                          },
  
                          below=of A},
  
         node distance = -1mm
  
           }
  
      centering
  
      setlengthtabcolsep{3pt}
  
  begin{tabular}{@{} m{64mm} >{centering}m{80mm} >{$}c<{$} m{94mm} @{}}
  
  textcolor{red}{$v_1$ generate a temporary key pair list}
  
      &   tikz[baseline]{
  
          node [boxA] {$M_{x^1_{v_1}}$};
  
          node [boxB] {$mathcal{T}_1= M_1| Z_{H_1}(M_{1})$};
  
                          }
  
          &   H_1
  
              &   begin{itemize}
  
                  item   Generates $M_1=bigl{M x^1_{v_1},(t_1,Max_{H_1}bigr}$
  
                  item   Determine $mathrm{Sh}_{H_1}(M_1)$
  
                  end{itemize}\
  
      hdashline
  
  textcolor{red}{Execute the algorithm to get $(G_{T_1})$}newline
  
  $begin{multlined}[0.9linewidth]
  
  L_{H_1} = (mathcal{T}_1 | G_{mathcal{T}_{1}}| Mx^2_{v_1})| \
  
              sigma_{Pr^1_{v_1}}(mathcal{T}_1, G_{mathcal{T}_1}, Mx^2_{v_1})
  
   end{multlined}$
  
      &   tikz[baseline]{
  
          node [boxA] {$mathrm{L}_{H_1}$};
  
          node [boxB] {$mathcal{T}_2= M_2| Z_{H_2}(M_{1})| Z_{H_2}(M_2)$};
  
                          }
  
          &   H_2
  
              &   begin{itemize}
  
                  item   Verifies $mathrm{L}_{H_1}$
  
                  item   Verifies $G_{mathcal{T}_1}$
  
                  item   Generates $M_2=bigl{Mx^2_{v_1} | (t_{1}, Max_{H_{1}}) | (t_{2}, Max_{H_{2}})bigr}$
  
                  item   Determine $Z_{H_{2}}(M_{1})$
  
                  item   Determine $Z_{H_{2}}(M_{2})$
  
                  end{itemize}\
  
      hdashline
  
  textcolor{red}{Execute the algorithm to get ($G_{mathcal{T}_{2}})$} newline
  
  $begin{multlined}[0.9linewidth]
  
  L_{H_2}=(mathcal{T}_2|G_{mathcal{T}_2}| Mx^3_{v_1}) |  \
  
          sigma_{SK^1_{v_1}}(mathcal{T}_2, G_{mathcal{T}_2}, Mx^3_{v_1})
  
   end{multlined}$
  
      &   tikz[baseline]{
  
          node [boxA] {$mathrm{L}_{H_2}$};
  
          node [boxB] {$mathcal{T}_3= M_1| sigma(M_1)| M_3|
  
                        Z_{H_3}(M_2)| Z_{H_3}(M_3)$};
  
                          }
  
          &   H_3
  
              &   begin{itemize}
  
                  item   Verifies $mathrm{L}_{H_2}$ and execution
  
                  item   Verifies $G_{mathcal{T}_2}$
  
                  item   Determine $Z_{H_{3}}(M_1)$
  
                  item   Determine $sigma(M_1)$
  
                  item   Generates
  
                  $begin{multlined}[t]
  
                  M_{3}=bigl{Mx^{3}_{v_1}| (t_1, Max_{H_1})|   \
  
                  (t_2, Max_{H_2}| (t_3, Max_{H_3})bigr}
  
                   end{multlined}$
  
                  item   Determine $Z_{H_3}(M_2)$
  
                  item   Determine $Z_{H_3}(M_3)$
  
                  end{itemize}\
  
      hdashline
  
  textcolor{red}{execute the algorithm to get ($G_{mathcal{T}_3}$)} newline
  
  $begin{multlined}[0.9linewidth]
  
  L_{H_3}=(mathcal{T}_{3}|G_{mathcal{T}_3}| Mx^4_{v_1})| \ sigma_{SK^3_{v_1}}(mathcal{T}_3, G_{mathcal{T}_3}, Mx^4_{v_1})
  
   end{multlined}$
  
      &   tikz[baseline]{
  
          node [boxA] {$mathrm{L}_{H_3}$};
  
          node [boxB] {$mathcal{T}_4=M_2| sigma(M_2)|
  
                        M_4|Z_{H_4}(M_3)| Z_{H_4}(M_4)$};
  
                          }
  
          &   H_4
  
              &   begin{itemize}
  
                  item   Verifies $mathrm{L}_{H_3}$ and execution
  
                  item   Verifies $G_{mathcal{T}_{3}}$
  
                  item   Determine $Z_{H_{4}}(M_{2})$
  
                  item   Determine $sigma({M_{{2}}})$
  
                  item   Generates
  
                  $begin{multlined}[t]
  
                  M_4=bigl{Mx^4_{v_1}|(t_1, Max_{H_1})| \
  
                      (t_2, Max_{H_2})| (t_3, Max_{H_3})| (t_4, Max_{H_4})bigr}
  
                   end{multlined}$
  
                  item   Determine $Z_{H_4}(M_3)$
  
                  item   Determine $Z_{H_4}(M_4)$
  
                  end{itemize}\
  
  hdashline
  
  end{tabular}
  
  endgroup
  
  end{document}