Base64编码隐藏


平时只知道解码，不知道base怎么来的。这里找了一个base64的具体过程：

CTF{easy_base64}

HTTP头注入


密码：CTF{easy_base64}

修改UA为ctf-show-brower


CTF{user_agent_inject_success}

Base64多层嵌套解码

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document. getElementById('loginForm').addEventListener('submit', function(e) {
const correctPassword = "SXpVR1F4TTFVe1JtdFNSazB3VTJ4U1UwNXFSWGRVV1ZrOWNWYzU=";
function validatePassword(input){
 let encoded = btoa(input);
 encoded = btoa(encoded + 'xH7jK').slice(3);
 encoded = btoa(encoded.split('').reverse(). join(''));
 encoded = btoa('aB3' + encoded + 'qW9'). substr(2);
 return btoa(encoded) === correctPassword;
}
const enteredPassword = document.getElementById('password').value;
const messageElement = document.getElementById('message');
if (!validatePassword (enteredPassword)){
 e. preventDefault();
 messageElement. textContent = "Login failed! Incorrect password.";
 messageElement. className = "message error";
}
});