每天10道Crypto Day 2

BUUCrypto

1. yxx
2.[BJDCTF2020]signin
3.[MRCTF2020]天干地支+甲子
4.浪里淘沙
5.[MRCTF2020]vigenere
6.[MRCTF2020]keyboard
7.鸡藕椒盐味
8.[WUSTCTF2020]佛说：只能四天
9.[MRCTF2020]古典密码知多少
10.[AFCTF2018]Vigenère

1. yxx

和异性相吸那道题一样的解法，得到flag:{xor_xor_xor_biubiubiu}
异性相吸

2.[BJDCTF2020]signin

题目：

welcome to crypto world！！
密文：
424a447b57653163306d655f74345f424a444354467d

第一眼看时以为是base32加密，因为昨天刚做base32（A-Z,2-7,不过这个题完全不是咯，还是太菜了）

再次看，字母没有超过f，16进制转字符：

flag{We1c0me_t4_BJDCTF}

3.[MRCTF2020]天干地支+甲子

60甲子数表

甲戌甲寅甲寅癸卯己酉甲寅辛丑
11 51 51 40 46 51 38

题目标题是天干+甲子（甲子=60）
python脚本：

a = [11,51,51,40,46,51,38]
b=[]
for i in a:i=i+60b.append(i)for j in b:print(chr(j),end='')

得到flag{Goodjob}

4.浪里淘沙

词频分析，统计单词个数排序：
用word文档可以查词，再用Excel排序（我只会这种傻办法了）

题目提示的 :把获得的单词连在一起提交即可。（我这里有一串数字：4，8，11，15，16）

flag{weshouldlearnthecryto}

5.[MRCTF2020]vigenere

密文：

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oe btlc ckjwc qnxdta
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xqev vy ewgis balicrxw hvnczg hvppq efr, eyksxi pqj mshteyutvt ntv hygye twerry.

在线解密(需去外面)
该在线工具在不知道密钥的情况下破坏了Vigenère密码。除经典变体之外，还支持Beaufort密码和Autokey密码。

flag{vigenere_crypto_crack_man}

6.[MRCTF2020]keyboard

题目直接讲了键盘密码：
（6：拼音9键第六个键的第一个字母m；
666：第六个键的第三个字母o；同理）

（注意：最后一个数应该是33，暴打出题人）

得到flag{mobilephone}

7.鸡藕椒盐味

对题目给的海明码直接进行校验

题目中提到，验证码打印的时候到了一下，所以应校验倒过来的验证码；
得到正确的编码为：000001011011

然后转换成md5编码得到（提交是错误的）：068317ddb54bf04798020790d6c7ded1

接着我把顺序换成了110110100000，再md5加密得到：
flag{d14084c7ceca6359eaac6df3c234dd3b}

8.[WUSTCTF2020]佛说：只能四天

第一个txt看不懂的话，第二个txt提到<新约全书>，这里就要用到 新约佛论禅，佛曰加密

解出来是核心价值观编码

RLJDQTOVPTQ6O6duws5CD6IB5B52CC57okCaUUC3SO4OSOWG3LynarAVGRZSJRAEYEZ_ooe_doyouknowfence

告诉我们还有栅栏加密,将
RLJDQTOVPTQ6O6duws5CD6IB5B52CC57okCaUUC3SO4OSOWG3LynarAVGRZSJRAEYEZ_ooe进行解密

得到:R5UALCUVJDCGD63RQISZTBOSO54JVBORP5SAT2OEQCWY6CGEO53Z67L_doyouknowCaesar@

注意题目：凯撒不是最后一步，by the way，凯撒为什么叫做凯撒？

通过百度百科我们得到：“恺撒密码”它是一种替代密码，通过将字母按顺序推后3位起到加密作用

将R5UALCUVJDCGD63RQISZTBOSO54JVBORP5SAT2OEQCWY6CGEO53Z67L凯撒解密，位移3位。

得到：
O5RXIZRSGAZDA63ONFPWQYLPL54GSYLOM5PXQ2LBNZTV6ZDBL53W67I

这段字符串的特点（A-Z，数字2-7），base32解密：（有些工具解不出这段base32）

得到flag{ni_hao_xiang_xiang_da_wo}

9.[MRCTF2020]古典密码知多少

猪圈加密+圣堂武士密码+银河字母
得到：FGCPFLIRTUASYON，提交发现是错误的

题目中提到 fence 栅栏,试了一下栅栏解密得到：
FLAGISCRYPTOFUN
所以 flag{CRYPTOFUN}

10.[AFCTF2018]Vigenère

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在线解密(需去外面)
该在线工具在不知道密钥的情况下破坏了Vigenère密码。除经典变体之外，还支持Beaufort密码和Autokey密码。

和上面解密过程一样

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