关于前端:JS加密入门之控制流平坦化2

JS 混同加密是一种将 JavaScript 代码进行混同和加密的技术，旨在使代码更难以浏览和了解，从而减少破解难度。控制流平坦化是其中一种罕用的混同技术，它能够使代码的管制流程变得非常复杂，减少代码的可读性和可维护性的难度。上面是一个应用控制流平坦化进行混同加密的示例代码：

javascriptCopy codefunction encrypt(text) {
  var encrypted = "";
  for (var i = 0; i < text.length; i++) {var code = text.charCodeAt(i);
    var newCode = code + 10;
    encrypted += String.fromCharCode(newCode);
  }
  return encrypted;
}

function decrypt(encrypted) {
  var decrypted = "";
  for (var i = 0; i < encrypted.length; i++) {var code = encrypted.charCodeAt(i);
    var newCode = code - 10;
    decrypted += String.fromCharCode(newCode);
  }
  return decrypted;
}

var input = "Hello World!";
var encrypted = encrypt(input);
var decrypted = decrypt(encrypted);
console.log(decrypted);

以上代码能够加密和解密一个字符串，然而它非常容易被破解，因为加密和解密的过程都是固定的，没有任何随机性和变动。为了减少代码的破解难度，咱们能够应用控制流平坦化技术，如下所示：

javascriptCopy codefunction encrypt(text) {
  var encrypted = "";
  var a = Math.floor(Math.random() * 10);
  if (a == 0) {for (var i = 0; i < text.length; i++) {var code = text.charCodeAt(i);
      var newCode = code + 10;
      encrypted += String.fromCharCode(newCode);
    }
  } else if (a == 1) {for (var i = 0; i < text.length; i++) {var code = text.charCodeAt(i);
      var newCode = code + 20;
      encrypted += String.fromCharCode(newCode);
    }
  } else if (a == 2) {for (var i = 0; i < text.length; i++) {var code = text.charCodeAt(i);
      var newCode = code + 30;
      encrypted += String.fromCharCode(newCode);
    }
  } else if (a == 3) {for (var i = 0; i < text.length; i++) {var code = text.charCodeAt(i);
      var newCode = code + 40;
      encrypted += String.fromCharCode(newCode);
    }
  } else if (a == 4) {for (var i = 0; i < text.length; i++) {var code = text.charCodeAt(i);
      var newCode = code + 50;
      encrypted += String.fromCharCode(newCode);
    }
  } else if (a == 5) {for (var i = 0; i < text.length; i++) {var code = text.charCodeAt(i);
      var newCode = code + 60;
      encrypted += String.fromCharCode(newCode);
    }
  } else if (a == 6) {for (var i = 0; i < text.length; i++) {

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