【JS加解密】暴力破解凯撒密文
【代码】
<!DOCTYPE html> <html lang="utf-8"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <head> <title>暴力破解凯撒密文</title> </head> <body onload="main();"> </body> </html> <script type="text/javascript"> <!-- /***************************************************************** * 用chrome浏览器打开执行，ctrl+shift+i看到执行结果。 ******************************************************************/ // 可接受的字符 const SYMBOLS="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890 !?,.%'"; // 代码起始，由body_onload调用 function main(){ var msg="SpmlApzAuv1A1olAhtv2u1AvmAiylh1oA6v2A1hrlEP1GzA1olAtvtlu1zA1oh1A1hrlA6v2Aiylh1oAh4h6E"; console.log("密文="+msg); console.log("破解结果:\n"); decrypt(msg); }; // 解密字符串 function decrypt(message){ var msg=message; const SYM_LENGTH=SYMBOLS.length; for(var j=1;j<SYM_LENGTH;j++){ var key=j; var translated=""; for(var i=0;i<msg.length;i++){ var letter=msg.at(i); var idx=SYMBOLS.indexOf(letter); if (idx!=-1 ){ translated+=SYMBOLS.at((idx-key)%SYM_LENGTH); }else{ translated+=letter; } } console.log(translated); } } //--> </script>
【执行结果】
密文=SpmlApzAuv1A1olAhtv2u1AvmAiylh1oA6v2A1hrlEP1GzA1olAtvtlu1zA1oh1A1hrlA6v2Aiylh1oAh4h6E
破解结果:
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Qnkj%nx%sty%ymj%frtzsy%tk%gwjfym%4tz%yfpjCNyEx%ymj%rtrjsyx%ymfy%yfpj%4tz%gwjfym%f2f4C
Pmji.mw.rsx.xli.eqsyrx.sj.fviexl.3sy.xeoiBMxDw.xli.qsqirxw.xlex.xeoi.3sy.fviexl.e1e3B
Olih,lv,qrw,wkh,dprxqw,ri,euhdwk,2rx,wdnhALwCv,wkh,prphqwv,wkdw,wdnh,2rx,euhdwk,dzd2A
Nkhg?ku?pqv?vjg?coqwpv?qh?dtgcvj?1qw?vcmg'KvBu?vjg?oqogpvu?vjcv?vcmg?1qw?dtgcvj?cyc1'
Mjgf!jt!opu!uif!bnpvou!pg!csfbui!zpv!ublf%JuAt!uif!npnfout!uibu!ublf!zpv!csfbui!bxbz%
Life is not the amount of breath you take.It's the moments that take you breath away.
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以上红粗字一行就是正确的结果。
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