BJDCTF 2nd总结

crypto

签到-y1ng

这道题基本上是最常见的体系base64直接解得BJD{W3lc0me_T0_BJDCTF}

老文盲了

这题挺奇葩的，打开发现内容为“罼雧締眔擴灝淛匶襫黼瀬鎶軄鶛驕鳓哵眔鞹鰝”前三个首写为BJD，后面读出来是“大括号这就是flag直接交了吧大括号”，所以提交BJD{淛匶襫黼瀬鎶軄鶛驕鳓哵}。

cat_flag

这题出的属于知识盲区，完全没有头绪，直到看讲解时得知可以“喵转二进制，二进制转字符”，涨知识。

灵能精通-y1ng

我是没想到出题人会将游戏人物技能来表达题目类型，然后将jpg打开是这个：根据得出BJD{IMKNIGHTSTEMPLAR}

燕言燕语-y1ng

题为
小燕子，穿花衣，年年春天来这里，我问燕子你为啥来，燕子说:
79616E7A69205A4A517B78696C7A765F6971737375686F635F73757A6A677D20
将数值转成字符串得yanzi ZJQ{xilzv_iqssuhoc_suzjg}
维吉尼亚密码解得BJD{yanzi_jiushige_shabi}

Y1nglish-y1ng

题：Nkbaslk ds sef aslckdqdqst. Sef aslckdqdqst qo lzqtbw usf ufkoplkt zth oscpslsfko. Dpkfk zfk uqjk dwcko su dscqao qt dpqo aslckdqdqst, kzap su npqap qo jkfw mzoqa. Qu wse zfk qtdkfkodkh qt tkdnsfw okaefqdw, nkbaslk ds czfdqaqczdk. Bkd lk dkbb wse z odsfw.
Q nzo pzjqtv hqttkf zd z fkodzefztd npkt Pzffw Odkkbk azlk qt, pk qo z Izcztkok ufsl Izczt med tsn pk qo tsd bqjqtv qt Izczt, lzwmk Pzffw qot’d z Izcztkok tzlk med pk qo fkzbbw z Izcztkok. Pzffw nsfwkh qt z bznwkf’o suuqak wkzfo zvs, med pk qo tsn nsfwqtv zd z mztw. Pk vkdo z vssh ozbzfw, med pk zbnzwo msffsno lstkw ufsl pqo ufqktho zth tkjkf czwo qd mzaw. Pzffw ozn lk zth azlk zthozdzd dpk ozlk dzmbk. Pk pzo tkjkf msffsnkh lstkw ufsl lk. Npqbk pk nzo kzdqtv, Q zowkh pql ds bkth lk &2. Ds lw oefcfqok, pk vzjk lk dpk lstkw qllkhqzdkbw. ‘Q pzjk tkjkf msfffsnkh ztw lstkw ufsl wse,’ Pzffw ozqh,‘os tsn wse azt czw usf lw hqttkf!’ Tsn q nqbb vqjk wse npzd wse nztd.
MIH{cwdp0t_Mfed3_u0fa3_sF_geqcgeqc_ZQ_Af4aw}
我看到题就傻了，这么长。。。。
在使用了cryptogram solver后，得：
Welcome to our competition. Our competition is mainly for freshmen and sophomores. There are five types of topics in this competition, each of which is very basic. If you are interested in networy security, welcome to participate. Let me tell you a story. I was having dinner at a restaurant when Harry Steele came in, he is a Japanese from Japan but now he is not living in Japan, maybe Harry isn’t a Japanese name but he is really a Japanese. Harry woryed in a lawyer’s office years ago, but he is now worying at a bany. He gets a good salary, but he always borrows money from his friends and never pays it bacy. Harry saw me and came andsatat the same table. He has never borrowed money from me. While he was eating, I asyed him to lend me &2. To my surprise, he gave me the money immediately. ‘I have never borrrowed any money from you,’ Harry said,‘so now you can pay for my dinner!’ Now i will give you what you want. BJD{pyth0n_Brut3_f0rc3_oR_quipquip_AI_Cr4cy}
后得指点如下
最后一单词是错误的，hint 也告知有个地方需要自己修正。
1.cracy 这单词很明显翻译不通顺

2.networy security 应该人人都知道是 network security 吧

3.hint 告诉了不是改成 crazy（我是真的没看出来 ）