easyjava

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首先会检测输入是否以“flag{”开头，以“}”结尾

然后将输入进行处理

因此逆向处理，即可得到flag

脚本如下：

blist = [17, 23, 7, 22, 1, 16, 6, 9, 21, 0, 15, 5, 10, 18, 2, 24, 4, 11, 3, 14, 19, 12, 20, 13, 8, 25]
alist = [21, 4, 24, 25, 20, 5, 15, 9, 17, 6, 13, 3, 18, 12, 10, 19, 0, 22, 2, 11, 23, 1, 8, 7, 14, 16]
words = 'abcdefghijklmnopqrstuvwxyz'
ans = 'wigwrkaugala'
res = ''

for i in ans:
    anum2 = ord(i) - ord('a')
    anum = alist[anum2]
    bvalue = blist[anum]
    bs = words[bvalue]
    words += words[0]
    words = words[1:]
    blist.append(blist[0])
    del(blist[0])
    print(blist)
    res += bs

print(res)

 

得到flag

flag{venividivkcr}