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62. Image encryption scheme with bit-level scrambling and multiplication diffusion
Image encryption.rar
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内容介绍
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/62572ce9bd8c6f2306b96d9f/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/62572ce9bd8c6f2306b96d9f/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">Ima<span class="_ _0"></span>ge<span class="_ _1"> </span>enc<span class="_ _0"></span>rypt<span class="_ _0"></span>ion<span class="_ _1"> </span>sc<span class="_ _0"></span>he<span class="_ _0"></span>me<span class="_ _1"> </span>with<span class="_ _1"> </span>bi<span class="_ _0"></span>t-<span class="_ _0"></span>leve<span class="_ _0"></span>l<span class="_ _1"> </span>scr<span class="_ _0"></span>amb<span class="_ _0"></span>ling</div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0">and<span class="_ _1"> </span>m<span class="_ _0"></span>ulti<span class="_ _0"></span>pli<span class="_ _0"></span>cati<span class="_ _0"></span>on<span class="_ _1"> </span>diff<span class="_ _0"></span>us<span class="_ _0"></span>ion</div><div class="t m0 x1 h3 y3 ff2 fs1 fc0 sc0 ls0 ws0">Chun<span class="_ _0"></span>-La<span class="_ _0"></span>i<span class="_ _2"> </span>Li</div><div class="t m1 x2 h4 y4 ff2 fs2 fc0 sc0 ls0 ws0">1</div><div class="t m0 x3 h3 y3 ff3 fs3 fc0 sc0 ls0 ws0">&amp;<span class="_ _3"> </span><span class="ff2 fs1">Yan<span class="_ _0"></span>g<span class="_ _2"> </span>Zhou</span></div><div class="t m1 x4 h4 y4 ff2 fs2 fc0 sc0 ls0 ws0">1</div><div class="t m0 x5 h3 y3 ff3 fs3 fc0 sc0 ls0 ws0">&amp;<span class="_ _3"> </span><span class="ff2 fs1">Hon<span class="_ _0"></span>g-M<span class="_ _0"></span>in<span class="_ _2"> </span>Li</span></div><div class="t m1 x6 h4 y4 ff2 fs2 fc0 sc0 ls0 ws0">1</div><div class="t m0 x7 h3 y3 ff3 fs3 fc0 sc0 ls0 ws0">&amp;<span class="_ _3"> </span><span class="ff2 fs1">Wei<span class="_ _3"> </span>Feng</span></div><div class="t m1 x8 h4 y4 ff2 fs2 fc0 sc0 ls0 ws0">1</div><div class="t m0 x9 h3 y3 ff3 fs3 fc0 sc0 ls0 ws0">&amp;<span class="_ _3"> </span><span class="ff2 fs1">Jian<span class="_ _0"></span>-Ro<span class="_ _0"></span>ng<span class="_ _3"> </span>Du</span></div><div class="t m1 xa h4 y4 ff2 fs2 fc0 sc0 ls0 ws0">1</div><div class="t m0 x1 h5 y5 ff4 fs3 fc0 sc0 ls0 ws0">Rec<span class="_ _0"></span>eiv<span class="_ _0"></span>ed:<span class="_ _4"> </span>16<span class="_ _4"> </span>June<span class="_ _4"> </span>2020<span class="_ _5"> </span>/<span class="_ _6"></span>Revi<span class="_ _0"></span>se<span class="_ _0"></span>d:<span class="_ _4"> </span>14<span class="_ _4"> </span>Januar<span class="_ _0"></span>y<span class="_ _4"> </span>2021<span class="_ _5"> </span>/<span class="_ _6"> </span>Acce<span class="_ _0"></span>pte<span class="_ _0"></span>d:<span class="_ _4"> </span>4<span class="_ _3"> </span>Feb<span class="_ _0"></span>ruar<span class="_ _0"></span>y<span class="_ _4"> </span>2021</div><div class="t m0 x1 h6 y6 ff5 fs3 fc0 sc0 ls0 ws0">#</div><div class="t m0 xb h5 y7 ff4 fs3 fc0 sc0 ls0 ws0">The<span class="_ _4"> </span>Auth<span class="_ _0"></span>or<span class="_ _0"></span>(s)<span class="_ _0"></span>,<span class="_ _4"> </span>under<span class="_ _4"> </span>exc<span class="_ _0"></span>lusi<span class="_ _0"></span>ve<span class="_ _4"> </span>lice<span class="_ _0"></span>nc<span class="_ _0"></span>e<span class="_ _4"> </span>to<span class="_ _3"> </span>Spri<span class="_ _0"></span>nge<span class="_ _0"></span>r<span class="_ _4"> </span>Scie<span class="_ _0"></span>nce<span class="_ _0"></span>+Bu<span class="_ _0"></span>sin<span class="_ _0"></span>ess<span class="_ _4"> </span>Medi<span class="_ _0"></span>a,<span class="_ _4"> </span>LLC<span class="_ _4"> </span>part<span class="_ _4"> </span>of<span class="_ _4"> </span>Spr<span class="_ _0"></span>inge<span class="_ _0"></span>r<span class="_ _4"> </span>Natu<span class="_ _0"></span>re<span class="_ _4"> </span>2021</div><div class="t m0 x1 h7 y8 ff6 fs1 fc0 sc0 ls0 ws0">Abst<span class="_ _0"></span>ra<span class="_ _0"></span>ct</div><div class="t m0 x1 h8 y9 ff7 fs4 fc0 sc0 ls0 ws0">As<span class="_ _7"> </span>the<span class="_ _1"> </span>most<span class="_ _7"> </span>effe<span class="_ _0"></span>ctiv<span class="_ _0"></span>e<span class="_ _7"> </span>meth<span class="_ _0"></span>od<span class="_ _7"> </span>of<span class="_ _7"> </span>mult<span class="_ _0"></span>imed<span class="_ _0"></span>ia<span class="_ _1"> </span>securi<span class="_ _0"></span>ty<span class="_ _7"> </span>prot<span class="_ _0"></span>ec<span class="_ _0"></span>tion<span class="_ _0"></span>,<span class="_ _7"> </span>imag<span class="_ _0"></span>e<span class="_ _7"> </span>encr<span class="_ _0"></span>ypti<span class="_ _0"></span>on<span class="_ _7"> </span>is</div><div class="t m0 x1 h8 ya ff7 fs4 fc0 sc0 ls0 ws0">wide<span class="_ _0"></span>ly<span class="_ _2"> </span>used<span class="_ _2"> </span>in<span class="_ _2"> </span>data<span class="_ _2"> </span>hidi<span class="_ _0"></span>ng,<span class="_ _2"> </span>se<span class="_ _0"></span>curi<span class="_ _0"></span>ty<span class="_ _2"> </span>auth<span class="_ _0"></span>enti<span class="_ _0"></span>cati<span class="_ _0"></span>on<span class="_ _2"> </span>and<span class="_ _2"> </span>cont<span class="_ _0"></span>ent<span class="_ _2"> </span>prot<span class="_ _0"></span>ecti<span class="_ _0"></span>on.<span class="_ _2"> </span>Howe<span class="_ _0"></span>ver,<span class="_ _3"> </span>the</div><div class="t m0 x1 h8 yb ff7 fs4 fc0 sc0 ls0 ws0">secu<span class="_ _0"></span>rity<span class="_ _1"> </span>and<span class="_ _1"> </span>effi<span class="_ _0"></span>cien<span class="_ _0"></span>cy<span class="_ _1"> </span>are<span class="_ _7"> </span>stil<span class="_ _0"></span>l<span class="_ _1"> </span>the<span class="_ _7"> </span>key<span class="_ _1"> </span>issu<span class="_ _0"></span>es<span class="_ _1"> </span>of<span class="_ _7"> </span>image<span class="_ _1"> </span>encr<span class="_ _0"></span>ypti<span class="_ _0"></span>on<span class="_ _1"> </span>algori<span class="_ _0"></span>thm.<span class="_ _1"> </span>In<span class="_ _1"> </span>this</div><div class="t m0 x1 h8 yc ff7 fs4 fc0 sc0 ls0 ws0">paper,<span class="_ _8"> </span>a<span class="_ _8"> </span>grayscale<span class="_ _8"> </span>image<span class="_ _8"> </span>encryption<span class="_ _8"> </span>scheme<span class="_ _8"> </span>based<span class="_ _8"> </span>on<span class="_ _8"> </span>the<span class="_ _8"> </span>architecture<span class="_ _8"> </span>of<span class="_ _8"> </span>bit-level</div><div class="t m0 x1 h8 yd ff7 fs4 fc0 sc0 ls1 ws0">scrambling<span class="_ _8"> </span>and<span class="_ _8"> </span>multiplication<span class="_ _8"> </span>diffusion<span class="_ _8"> </span>is<span class="_ _8"> </span>proposed.<span class="_ _8"> </span>Firstly,<span class="_ _8"> </span>the<span class="_ _8"> </span>input<span class="_ _8"> </span>image<span class="_ _8"> </span>is</div><div class="t m0 x1 h8 ye ff7 fs4 fc0 sc0 ls0 ws0">deco<span class="_ _0"></span>mpos<span class="_ _0"></span>ed<span class="_ _9"> </span>into<span class="_ _9"> </span>ei<span class="_ _0"></span>ght<span class="_ _9"> </span>bit<span class="_ _9"> </span>plan<span class="_ _0"></span>es<span class="_ _9"> </span>and<span class="_ _9"> </span>rand<span class="_ _0"></span>om<span class="_ _0"></span>ly<span class="_ _9"> </span>divi<span class="_ _0"></span>ded<span class="_ _9"> </span>into<span class="_ _9"> </span>th<span class="_ _0"></span>ree<span class="_ _9"> </span>part<span class="_ _0"></span>s.<span class="_ _9"> </span>Seco<span class="_ _0"></span>ndly<span class="_ _0"></span>,<span class="_ _9"> </span>the</div><div class="t m0 x1 h8 yf ff7 fs4 fc0 sc0 ls0 ws0">scram<span class="_ _a"></span>bling<span class="_ _8"> </span>proce<span class="_ _a"></span>ss<span class="_ _8"> </span>of<span class="_ _8"> </span>each<span class="_ _8"> </span>part<span class="_ _8"> </span>is<span class="_ _8"> </span>respect<span class="_ _a"></span>ively<span class="_ _8"> </span>real<span class="_ _a"></span>ized<span class="_ _8"> </span>by<span class="_ _8"> </span>using<span class="_ _8"> </span>binary<span class="_ _8"> </span>tre<span class="_ _a"></span>e,<span class="_ _8"> </span>flip</div><div class="t m0 x1 h8 y10 ff7 fs4 fc0 sc0 ls0 ws0">scra<span class="_ _0"></span>mbli<span class="_ _0"></span>ng<span class="_ _7"> </span>and<span class="_ _1"> </span>improv<span class="_ _0"></span>ed<span class="_ _7"> </span>circ<span class="_ _0"></span>le<span class="_ _7"> </span>inde<span class="_ _0"></span>x<span class="_ _7"> </span>scramb<span class="_ _0"></span>ling<span class="_ _0"></span>.<span class="_ _7"> </span>Final<span class="_ _0"></span>ly<span class="_ _0"></span>,<span class="_ _7"> </span>the<span class="_ _7"> </span>diffus<span class="_ _0"></span>in<span class="_ _0"></span>g<span class="_ _7"> </span>operat<span class="_ _0"></span>ion<span class="_ _1"> </span>of</div><div class="t m0 x1 h8 y11 ff7 fs4 fc0 sc0 ls0 ws0">the<span class="_ _4"> </span>scra<span class="_ _0"></span>mble<span class="_ _0"></span>d<span class="_ _4"> </span>compo<span class="_ _0"></span>nent<span class="_ _0"></span>s<span class="_ _4"> </span>is<span class="_ _3"> </span>exec<span class="_ _0"></span>uted<span class="_ _4"> </span>by<span class="_ _4"> </span>impr<span class="_ _0"></span>ovin<span class="_ _0"></span>g<span class="_ _4"> </span>the<span class="_ _4"> </span>GF<span class="_ _3"> </span>(257<span class="_ _0"></span>)<span class="_ _4"> </span>domain<span class="_ _4"> </span>mult<span class="_ _0"></span>ip<span class="_ _0"></span>lica<span class="_ _0"></span>tion<span class="_ _0"></span>.</div><div class="t m0 x1 h8 y12 ff7 fs4 fc0 sc0 ls0 ws0">The<span class="_ _7"> </span>rema<span class="_ _0"></span>rkab<span class="_ _0"></span>le<span class="_ _7"> </span>adva<span class="_ _0"></span>ntag<span class="_ _0"></span>e<span class="_ _7"> </span>of<span class="_ _b"> </span>the<span class="_ _7"> </span>scra<span class="_ _0"></span>mblin<span class="_ _0"></span>g<span class="_ _7"> </span>oper<span class="_ _0"></span>atio<span class="_ _0"></span>n<span class="_ _7"> </span>is<span class="_ _b"> </span>that<span class="_ _7"> </span>it<span class="_ _7"> </span>not<span class="_ _7"> </span>only<span class="_ _7"> </span>effe<span class="_ _0"></span>cti<span class="_ _0"></span>vely</div><div class="t m0 x1 h8 y13 ff7 fs4 fc0 sc0 ls0 ws0">permutes<span class="_ _8"> </span>the<span class="_ _8"> </span>pixels,<span class="_ _b"> </span>bu<span class="_ _a"></span>t<span class="_ _b"> </span>a<span class="_ _a"></span>lso<span class="_ _8"> </span>permutes<span class="_ _8"> </span>the<span class="_ _b"> </span>bits<span class="_ _8"> </span>in<span class="_ _8"> </span>each<span class="_ _b"> </span>pixel<span class="_ _a"></span>,<span class="_ _8"> </span>and<span class="_ _b"> </span>con<span class="_ _a"></span>sequently<span class="_ _8"> </span>it</div><div class="t m0 x1 h8 y14 ff7 fs4 fc0 sc0 ls0 ws0">suff<span class="_ _0"></span>icie<span class="_ _0"></span>nt<span class="_ _0"></span>ly<span class="_ _1"> </span>destro<span class="_ _0"></span>ys<span class="_ _1"> </span>the<span class="_ _1"> </span>corr<span class="_ _0"></span>elat<span class="_ _0"></span>ion<span class="_ _1"> </span>of<span class="_ _1"> </span>adjace<span class="_ _0"></span>nt<span class="_ _1"> </span>pixe<span class="_ _0"></span>ls.<span class="_ _1"> </span>And<span class="_ _1"> </span>the<span class="_ _1"> </span>parall<span class="_ _0"></span>el<span class="_ _1"> </span>proc<span class="_ _0"></span>essi<span class="_ _0"></span>ng<span class="_ _1"> </span>of</div><div class="t m0 x1 h8 y15 ff7 fs4 fc0 sc0 ls0 ws0">diff<span class="_ _0"></span>eren<span class="_ _0"></span>t<span class="_ _9"> </span>scramb<span class="_ _0"></span>ling<span class="_ _9"> </span>oper<span class="_ _0"></span>ati<span class="_ _0"></span>ons<span class="_ _9"> </span>will<span class="_ _9"> </span>increa<span class="_ _0"></span>se<span class="_ _9"> </span>the<span class="_ _1"> </span>co<span class="_ _0"></span>nfus<span class="_ _0"></span>ion<span class="_ _9"> </span>effe<span class="_ _0"></span>ct<span class="_ _9"> </span>and<span class="_ _1"> </span>re<span class="_ _0"></span>al-t<span class="_ _0"></span>ime<span class="_ _9"> </span>perfor<span class="_ _0"></span>-</div><div class="t m0 x1 h8 y16 ff7 fs4 fc0 sc0 ls0 ws0">manc<span class="_ _0"></span>e.<span class="_ _4"> </span>Moreov<span class="_ _0"></span>er<span class="_ _0"></span>,<span class="_ _4"> </span>the<span class="_ _4"> </span>key<span class="_ _4"> </span>stream<span class="_ _4"> </span>for<span class="_ _4"> </span>scra<span class="_ _0"></span>mbli<span class="_ _0"></span>ng<span class="_ _4"> </span>and<span class="_ _4"> </span>diffus<span class="_ _0"></span>io<span class="_ _0"></span>n<span class="_ _4"> </span>operat<span class="_ _0"></span>ions<span class="_ _4"> </span>is<span class="_ _4"> </span>desi<span class="_ _0"></span>gned<span class="_ _4"> </span>an<span class="_ _0"></span>d</div><div class="t m0 x1 h8 y17 ff7 fs4 fc0 sc0 ls0 ws0">sele<span class="_ _0"></span>cted<span class="_ _2"> </span>st<span class="_ _0"></span>rictl<span class="_ _0"></span>y<span class="_ _2"> </span>depend<span class="_ _0"></span>ent<span class="_ _2"> </span>on<span class="_ _2"> </span>the<span class="_ _c"> </span>plai<span class="_ _0"></span>n-<span class="_ _0"></span>imag<span class="_ _0"></span>e.<span class="_ _2"> </span>Theref<span class="_ _0"></span>ore,<span class="_ _2"> </span>our<span class="_ _2"> </span>encr<span class="_ _0"></span>ypti<span class="_ _0"></span>on<span class="_ _2"> </span>sche<span class="_ _0"></span>me<span class="_ _2"> </span>signif<span class="_ _0"></span>-</div><div class="t m0 x1 h8 y18 ff7 fs4 fc0 sc0 ls0 ws0">ican<span class="_ _0"></span>tly<span class="_ _4"> </span>improv<span class="_ _0"></span>es<span class="_ _4"> </span>the<span class="_ _3"> </span>secu<span class="_ _0"></span>rity<span class="_ _4"> </span>by<span class="_ _3"> </span>dist<span class="_ _0"></span>urbi<span class="_ _0"></span>ng<span class="_ _4"> </span>known-<span class="_ _0"></span>plai<span class="_ _0"></span>ntex<span class="_ _0"></span>t<span class="_ _4"> </span>and<span class="_ _3"> </span>chos<span class="_ _0"></span>en-p<span class="_ _0"></span>lain<span class="_ _0"></span>text<span class="_ _4"> </span>atta<span class="_ _0"></span>cks.</div><div class="t m0 x1 h8 y19 ff7 fs4 fc0 sc0 ls0 ws0">Sim<span class="_ _0"></span>ulat<span class="_ _0"></span>ion<span class="_ _4"> </span>ex<span class="_ _0"></span>peri<span class="_ _0"></span>ment<span class="_ _0"></span>s<span class="_ _4"> </span>and<span class="_ _4"> </span>secu<span class="_ _0"></span>rity<span class="_ _4"> </span>an<span class="_ _0"></span>alys<span class="_ _0"></span>es<span class="_ _4"> </span>fu<span class="_ _0"></span>rthe<span class="_ _0"></span>r<span class="_ _4"> </span>veri<span class="_ _0"></span>fy<span class="_ _4"> </span>that<span class="_ _4"> </span>t<span class="_ _0"></span>he<span class="_ _4"> </span>prop<span class="_ _0"></span>osed<span class="_ _4"> </span>al<span class="_ _0"></span>gori<span class="_ _0"></span>th<span class="_ _0"></span>m<span class="_ _4"> </span>is</div><div class="t m0 x1 h8 y1a ff7 fs4 fc0 sc0 ls0 ws0">secu<span class="_ _0"></span>re<span class="_ _2"> </span>and<span class="_ _2"> </span>effect<span class="_ _0"></span>ive<span class="_ _2"> </span>to<span class="_ _2"> </span>withs<span class="_ _0"></span>tand<span class="_ _2"> </span>vari<span class="_ _0"></span>ous<span class="_ _2"> </span>atta<span class="_ _0"></span>cks.</div><div class="t m0 x1 h9 y1b ff1 fs1 fc0 sc0 ls0 ws0">Keyw<span class="_ _0"></span>ord<span class="_ _0"></span>s<span class="_ _b"> </span><span class="ff7">Binary<span class="_ _5"> </span>t<span class="_ _0"></span>ree</span></div><div class="t m0 xc ha y1c ff7 fs1 fc0 sc0 ls0 ws0">.</div><div class="t m0 xd ha y1b ff7 fs1 fc0 sc0 ls0 ws0">Chao<span class="_ _0"></span>s<span class="_ _5"> </span>dyna<span class="_ _0"></span>mic<span class="_ _0"></span>s</div><div class="t m0 xe ha y1c ff7 fs1 fc0 sc0 ls0 ws0">.</div><div class="t m0 xf ha y1b ff7 fs1 fc0 sc0 ls0 ws0">Mul<span class="_ _0"></span>tipl<span class="_ _0"></span>ica<span class="_ _0"></span>tion<span class="_ _5"> </span>di<span class="_ _0"></span>ffu<span class="_ _0"></span>si<span class="_ _0"></span>on</div><div class="t m0 x10 ha y1c ff7 fs1 fc0 sc0 ls0 ws0">.</div><div class="t m0 x11 ha y1b ff7 fs1 fc0 sc0 ls0 ws0">Ima<span class="_ _0"></span>ge<span class="_ _5"> </span>encry<span class="_ _0"></span>pt<span class="_ _0"></span>ion</div><div class="t m0 x1 h5 y1d ff4 fs3 fc0 sc0 ls0 ws0">Mult<span class="_ _0"></span>im<span class="_ _0"></span>edi<span class="_ _0"></span>a<span class="_ _4"> </span>Tools<span class="_ _4"> </span>and<span class="_ _4"> </span>App<span class="_ _0"></span>lica<span class="_ _0"></span>ti<span class="_ _0"></span>ons</div><div class="t m0 x1 h5 y1e ff4 fs3 fc0 sc0 ls0 ws0">htt<span class="_ _0"></span>ps:<span class="_ _0"></span>//do<span class="_ _0"></span>i.<span class="_ _0"></span>org/<span class="_ _0"></span>10<span class="_ _0"></span>.100<span class="_ _0"></span>7/<span class="_ _0"></span>s110<span class="_ _0"></span>4<span class="_ _0"></span>2-02<span class="_ _0"></span>1-10<span class="_ _0"></span>63<span class="_ _0"></span>1-<span class="_ _0"></span>7</div><div class="t m0 x1 hb y1f ff8 fs5 fc0 sc0 ls0 ws0">*<span class="_ _d"> </span><span class="ff7">Chun<span class="_ _0"></span>-L<span class="_ _0"></span>ai<span class="_ _3"> </span>Li</span></div><div class="t m0 x12 hc y20 ff7 fs5 fc0 sc0 ls2 ws0">lic<span class="_ _a"></span>hun<span class="_ _a"></span>la<span class="_ _a"></span>i33@<span class="_ _a"></span>12<span class="_ _a"></span>6.<span class="_ _a"></span>com</div><div class="t m2 x1 hd y21 ff7 fs6 fc0 sc0 ls0 ws0">1</div><div class="t m0 x13 hc y22 ff7 fs5 fc0 sc0 ls0 ws0">Key<span class="_ _4"> </span>Labor<span class="_ _0"></span>ator<span class="_ _0"></span>y<span class="_ _3"> </span>of<span class="_ _3"> </span>Hun<span class="_ _0"></span>an<span class="_ _3"> </span>Provi<span class="_ _0"></span>nc<span class="_ _0"></span>e<span class="_ _3"> </span>on<span class="_ _3"> </span>Infor<span class="_ _0"></span>mati<span class="_ _0"></span>on<span class="_ _4"> </span>Photo<span class="_ _0"></span>nic<span class="_ _0"></span>s<span class="_ _3"> </span>and<span class="_ _3"> </span>Free<span class="_ _0"></span>spac<span class="_ _0"></span>e<span class="_ _3"> </span>Opt<span class="_ _0"></span>ical</div><div class="t m0 x13 hc y23 ff7 fs5 fc0 sc0 ls0 ws0">Com<span class="_ _0"></span>mun<span 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