Writeup sigma
Misc：签到题：与佛解码
Zip：图片一眼看长宽不太对，拉长图片看到^5 看到密文应该用这个当钥匙解开，到工具里试了出来
Web：目录：输入路径拿到
五子棋：下赢得
F09F9983F09F92B5F09F8CBFF09F8EA4F09F9AAAF09F8C8FF09F908EF09FA58BF09F9AABF09F9886F09F94AAE29883F09F9181F09F8E83F09F94AAF09F95B9F09F9AB0F09FA4A3F09F92A7F09F8EA4E29C96F09F8DB4F09F95B9F09F9191F09F94AAF09F8EA4F09F908EE29880F09F9983F09F9AA8F09F9181F09F8DB5F09F9189F09F8FB9F09F8EA4F09F9AB0F09F9882F09F988EF09F92B5F09F9887F09F9690F09F92A7F09F9983E29C89F09F9880F09F8F8EF09F988EF09F91A3F09F9881F09F988AF09FA693F09F9AABF09F988AF09F9983E29C89F09F9085F09F95B9F09F8CAAE29882F09FA58BF09FA693F09F8E85E29D93F09F8E88
“We got about more than 120 regular clients, and mainly 95 % of them are from the Canton Fair,” said Nick Koay, Chairman of Maycham China Greater Bay. He indicated that Canton Fair is a good platform and he hope to get more new customers from the domestic market.The 130th session of the China Import and Export Fair, also known as the Canton Fair, kicked off on October 14 in Guanghou, Guangdong. With the theme slogan “Canton Fair Global Share,” the fair is held in both offline and online forms and lasts five days to showcase 16 product categories across 51 exhibition areas.Nick Koay has participated the Canton Fair for 15 years. The products of his factory in Zhuhai are sold to about 30 countries in the world, and 95 % of his regular clients are from the fair. “gxuctf{D0_N0T_know_what_2_c}Canton Fair is one of the largest exhibitions in the world, and also, is a very good platform”, he said.Due to the COVID-19, many international buyers and exhibitors can’t join the fair on site, and the online provides them another platform. Nick Koay believed that it’s a kind of future business model. “We can be introduced to our new clients, and the online fair is quiet useful for our business.”In addition, Nick Koay was full of expectation about the 130th Canton Fair: “We are looking forward to having more domestic customers for expanding our business in the domestic market.
Selec题目：
二进制换十进制，发现有==结尾这个是base64，解码得出，看来罗马需要凯撒密码进行移位
最后进行替换密码的运算
aulqmcpthcpeuld! but rcwo zeledron pro koqellom ambgpuqmcgrb archholqo. romo ed c zhcq zum chh butm rcmn ozzumpd: qitapz{l0s_pr4pd_sr4p_e_a4hh_ambgp0}. but sehh zeln prcp c hup uz ambgpuqmcgrb ed jtdp ktehnelq uzz pred dump uz kcdea flushonqo, cln ep mochhb ed lup du kcn czpom chh. rugo but oljubon pro archholqo!
q i t a p z h o c u m b l d g r e s w n k j f
g x u c t f l e a o r y n s p h i w v d b m k
flag gxuctf{n0w_th4ts_wh4t_i_c4ll_crypt0}
鹦鹉学舌
密码给提示了，我猜是弱密码，暴力破解
成功
BABBAAABAAAAABAABBBAABBAAAABAABABBBAAAAABABBBAABBB
Gxuctf{wecomexaxh}
V：多表我猜是维吉尼亚，但没想到密码是维吉尼亚，密文给出来其实是几个按键围在一起中间的那个字母。。。
Gpcoiqkjonmnzxvnxugpmyw我猜可能又是要维吉尼亚来解开，提示给6位，又是多表，我猜是gxuctf
