攻防世界crypto进阶区之sherlock

最新推荐文章于 2025-05-29 11:13:39 发布

Sylvia_j

最新推荐文章于 2025-05-29 11:13:39 发布

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本文链接：https://blog.youkuaiyun.com/qq_46927150/article/details/105976279

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本文介绍了攻防世界crypto进阶区的Sherlock挑战，涉及从书籍内容中提取大写字母，转换为01序列，并通过二进制转字符串的方法解密，最终得出flag。解密过程包括使用grep命令和tr命令进行文本处理。

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sherlock

题目来源： bitsctf-2017

附件是一本书的内容，发现其中有些字母莫名地大写
在这里插入图片描述
利用命令cat 文件名 | grep -Eo '[A-Z]' |tr -d '\n'将大写字母提取出来

cat 1.txt | grep -Eo '[A-Z]' |tr -d '\n'

这是提取出来的内容：

ZEROONEZEROZEROZEROZEROONEZEROZEROONEZEROZEROONEZEROZEROONEZEROONEZEROONEZEROONEZEROZEROZEROONEZEROONEZEROZEROONEONEZEROONEZEROZEROZEROZEROONEONEZEROONEZEROONEZEROONEZEROZEROZEROONEZEROZEROZEROONEONEZEROZEROONEONEONEONEZEROONEONEZEROONEONEZEROONEZEROZEROZEROZEROZEROONEONEZEROZEROZEROONEZEROONEONEZEROZEROONEZEROZEROZEROZEROONEONEZEROZEROONEONEZEROONEZEROONEONEONEONEONEZEROZEROONEONEZEROZEROZEROONEZEROONEONEZEROONEONEONEZEROZEROONEZEROONEONEONEONEONEZEROONEONEONEZEROZEROZEROZEROZEROONEONEZEROONEONEZEROZEROZEROZEROONEONEZEROONEZEROZEROZEROZEROONEONEZEROZEROZEROONEZEROONEONEZEROONEONEONEZEROZEROONEZEROONEONEONEONEONEZEROZEROONEONEZEROONEZEROONEZEROZEROONEONEZEROZEROZEROONEZEROZEROONEONEZEROONEONEONEZEROZEROONEONEZEROZEROONEONEZEROONEONEONEONEON

将zero转成0，one转成1

010000100100100101010100010100110100001101010100010001100111101101101000001100010110010000110011010111110011000101101110010111110111000001101100001101000011000101101110010111110011010100110001001101110011001101111101

将二进制转成字符串
在这里插入图片描述
得到flag：BITSCTF{h1d3_1n_pl41n_5173}