一个小谜题的解法

Wi1dcard 的个人博客 / 0 / 4 / 创建于 5年前 / 更新于 5年前

发现大家简历都开始流行 base64 电话号码了，于是自己也跟了个风，留了个小谜题，密文如下：

XHg2OFx4NzRceDc0XHg3MFx4NzNceDNhXHgyZlx4MmZceDc0XHg2NVx4NzJceDZkXHg2Mlx4NjlceDZlXHgyZVx4NjNceDZmXHg2ZFx4MmZceDZjXHg2Y1x4NjJceDYz

可惜似乎没人能解开呀。思路稍微有点绕，用代码写出来吧：

$cipher = "XHg2OFx4NzRceDc0XHg3MFx4NzNceDNhXHgyZlx4MmZceDc0XHg2NVx4NzJceDZkXHg2Mlx4NjlceDZlXHgyZVx4NjNceDZmXHg2ZFx4MmZceDZjXHg2Y1x4NjJceDYz";

// 1. base64
$escaped_hex = base64_decode($cipher);
echo 'escaped_hex: ' . $escaped_hex . PHP_EOL;

// 2. "\x" unescape
eval('$url = "' . $escaped_hex . '";');
echo 'url: ' . $url . PHP_EOL;

// 3. read this url
$resource = trim(
    file_get_contents($url)
);
echo 'resource: ' . $resource . PHP_EOL;

// 4. trim
$encoding = strstr($resource, ':', true);
echo 'encoding: ' . $encoding . PHP_EOL;

// 5. absorb real data
$parts = explode(' ', $resource);
array_shift($parts);
$hex = implode('', $parts);
echo 'hex: ' . $hex . PHP_EOL;

// 6. get the raw binary
$bin = pack('H*', $hex);

// 7. final convert
$results = mb_convert_encoding($bin, 'utf-8', $encoding);
echo 'RESULTS: ' . $results . PHP_EOL;

有兴趣可以尝试一下～

不过红包已经过期了?