BugKu CTF（Crypto）：[+-＜＞] & 把猪困在猪圈里 & 你喜欢下棋吗 & 小山丘的秘密-阿里云开发者社区

前言

BugKu是一个由乌云知识库（wooyun.org）推出的在线。乌云知识库是一个致力于收集、整理和分享互联网安全信息的社区平台。

BugKu旨在提供一个实践和学习网络安全的平台，供安全爱好者和测试人员进行挑战和练习。它包含了各种不同类型的场景，如Web、系统、密码学等，参与者需要通过解决这些来获取Flag。

BugKu的特点如下：

1. 丰富：BugKu提供了大量的场景供用户挑战，涵盖了常见的Web，如XSS、SQL注入、文件上传等，以及其他类型的，如逆向工程、密码学等。

2. 适合不同水平：BugKu的题目分为不同的难度级别，适合不同水平的参与者。从初学者到专业测试人员，都能在BugKu中找到适合自己的挑战。

3. 学习资源：BugKu提供了丰富的学习资源，包括解题思路、分析、修复建议等。参与者可以通过学习他人的解题思路和经验，提高自己的技术水平。

4. 排行榜竞赛：BugKu设置了排行榜，参与者可以通过解决题目获取积分，竞争排名。这种竞争激励机制可以激发参与者的学习兴趣和动力。

通过参与BugKu，参与者可以在实践中学习到真实的和技术，提高自己的技术水平。同时，BugKu也是一个交流和分享的平台，参与者可以与其他安全爱好者进行讨论和学习，共同成长。

CTF Crypto

密码学（Cryptography）一般可分为古典密码学和现代密码学。

其中，古典密码学，作为一种实用性艺术存在，其编码和破译通常依赖于设计者和敌手的创造力与技巧，并没有对密码学原件进行清晰的定义。古典密码学主要包含以下几个方面：

单表替换加密（Monoalphabetic Cipher）

多表替换加密（Polyalphabetic Cipher）

奇奇怪怪的加密方式

而现代密码学则起源于 20 世纪中后期出现的大量相关理论，1949 年香农（C. E. Shannon）发表了题为《保密系统的通信理论》的经典论文标志着现代密码学的开始。现代密码学主要包含以下几个方面：

对称加密（Symmetric Cryptography），以 DES，AES，RC4 为代表。

非对称加密（Asymmetric Cryptography），以 RSA，ElGamal，椭圆曲线加密为代表。

哈希函数（Hash Function），以 MD5，SHA-1，SHA-512 等为代表。

数字签名（Digital Signature），以 RSA 签名，ElGamal 签名，DSA 签名为代表。

其中，对称加密体制主要分为两种方式：

分组密码（Block Cipher），又称为块密码。

序列密码（Stream Cipher），又称为流密码。

一般来说，密码设计者的根本目标是保障信息及信息系统的

机密性（Confidentiality）

完整性（Integrity）

可用性（Availability）

认证性（Authentication）

不可否认性（Non-repudiation）

其中，前三者被称为信息安全的 CIA 三要素。

而对于密码破解者来说，一般是要想办法识别出密码算法，然后进行，或者利用密码体制的进行破解。当然，也有可能通过构造虚假的哈希值或者数字签名来绕过相应的检测。

一般来说，我们都会假设已知待破解的密码体制，而攻击类型通常分为以下四种：

类型	说明
唯密文	只拥有密文
已知明文	拥有密文与对应的明文

选择明文	拥有加密权限，能够对明文加密后获得相应密文
选择密文	拥有解密权限，能够对密文解密后获得相应明文

一、[+-<>]

打开

看描述还是 brainfuck 加密，第三方网站解密

二、把猪困在猪圈里

打开

文件内容如下

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可以看到最后是 = 结尾，推测为 Base64 图片，因为内容有很多重复字段