从一道CTF签到题说起：手把手教你用Python脚本搞定Base16/Base64编码转换与逆序处理

从一道CTF签到题说起手把手教你用Python脚本搞定Base16/Base64编码转换与逆序处理在网络安全竞赛中编码转换就像侦探破案时的密码本掌握它往往能快速打开突破口。最近遇到一道看似简单的CTF签到题却让不少新手卡在了Base16到Base64的转换环节。这道题的精妙之处在于它不仅在考察基础编码知识更隐藏着字符串逆序处理的陷阱——而这正是许多自动化脚本失败的关键点。1. 编码基础Base16与Base64的本质差异Base16和Base64就像两种不同的语言翻译器虽然都能将二进制数据转换成可打印字符但它们的词汇表和语法规则截然不同。Base16十六进制编码使用16个字符0-9和A-F每个字符精确对应4位二进制半字节编码后数据体积膨胀为原来的2倍Base64使用64个字符A-Z、a-z、0-9、、/每3字节二进制数据转换为4个字符编码后数据体积约为原来的1.33倍常用作为填充字符import base64 # Base64编码示例 raw_data bCTF{Base64_Example} encoded base64.b64encode(raw_data) print(encoded) # bQ1RGe0Jhc2U2NF9FeGFtcGxlfQ # Base16编码示例 import codecs encoded_hex codecs.encode(raw_data, hex) print(encoded_hex) # b4354467b4261736536345f4578616d706c657d注意Python中base64模块默认处理字节串(bytes)遇到字符串需先进行UTF-8编码2. 实战解题逆向思维处理异常编码那道卡住无数人的CTF签到题表面看是普通的Base16转Base64实则暗藏玄机。原始数据如下wIDIgACIgACIgAyIK0wIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMiCNoQD jMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjoQDjACIgACIgACIggDM6EDM6AjMgAzMtMDMtEjM ... QIhM0QDN0Q2.1 第一步发现编码异常常规Base64字符串的特征长度通常是4的倍数填充符只出现在末尾字符集严格限定在A-Za-z0-9/而题目中的字符串出现在行首而非行尾每行长度不一致含有看似随机的字符组合2.2 第二步编写逆序处理脚本关键突破点在于发现需要逐行逆序才能得到标准Base64格式data [ wIDIgACIgACIgAyIK0wIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMiCNoQD, jMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjMyIjoQDjACIgACIgACIggDM6EDM6AjMgAzMtMDMtEjM, # 其他行数据省略... QIhM0QDN0Q ] reversed_lines [line[::-1] for line in data] for line in reversed_lines: print(line)执行后会得到符合规范的Base64字符串
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