编码/解码，加密/解密

1. Jsfuck加解密

• JSFuck - 一种极端的JavaScript混淆技术

• JSFuck是一种基于JavaScript的深奥编程风格，仅使用6个字符来编写代码：[, ], (, ), ! 和 +。尽管有这种极端限制，JSFuck可以表达任何有效的JavaScript代码。

(1)JSFuck工作原理

JSFuck利用了JavaScript的类型强制转换和各种特性：

1. 构造所有其他JavaScript字符和值
2. 构建字符串、数字和对象
3. 调用函数和方法

(2)基础示例

• false 可以写成 ![]
• true 可以写成 !![]
• undefined 可以写成 [][[]]
• NaN 可以写成 +[![]]

(3)字符构造

字符通常通过以下方式构建：

1. 创建对应ASCII码的数字
2. 使用String.fromCharCode()将其转换为字符

例如字母"a"(ASCII 97)可以构造为：

(![]+[])[+!+[]] // 结果是"a"

(4)为什么使用JSFuck？

虽然在实际编码中不实用，但JSFuck可用于：

• 代码混淆（使代码难以阅读）
• 代码高尔夫挑战
• 展示JavaScript类型强制的特性
• 绕过某些安全过滤器（尽管现在很多都能检测JSFuck）

(5)局限性

1. 代码体积：JSFuck代码极其冗长
2. 性能：大量的类型转换效率低下
3. 可读性：不经过反混淆几乎无法理解
4. 兼容性：某些构造可能无法在所有JavaScript引擎中工作

(6)示例

下面是一个简单的JSFuck版"flag{hello_world!}"：

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(7)加解密实现

• 在线工具：url