攻防世界-ey-or

记录一下特征吧

Elymas语言编写。谁会啊、、、、、

strings命令；

编译后：

　　

secret = [ ???? ] f = [ ???? ] l = len(secret) buffer = [] i = 0 j = 0 print "Enter Password line by line" for line in sys.stdin.readlines(): j = read_int(line) buffer = buffer + [j] if secret[i] != j: sys.exit(1) i += 1 if i == l: print to_string(map(lambda x,y: x^y, buffer, f)) sys.exit(0)
python脚本：

import sys
import subprocess

ans = [] while True: for j in range(256): if j % 16 == 15: print j p = subprocess.Popen("./ey_or.elf", stdin=subprocess.PIPE, stdout=subprocess.PIPE) for x in ans: p.stdin.write(str(x) + '\n') p.stdin.write(str(j) + '\n') p.stdin.close() ret = p.wait() if ret != 1: ans.append(j) print ans break

import sys
import subprocess

s = [36, 30, 156, 30, 43, 6, 116, 22, 211, 66, 151, 89, 36, 82, 254, 81, 182, 134, 24, 90, 119, 6, 88, 137, 64, 197, 251, 15, 116, 220, 161, 94, 154, 252, 139, 11, 41, 215, 27, 158, 143, 140, 54, 189, 146, 48, 167, 56, 84, 226, 15, 188, 126, 24]

ans = []

p = subprocess.Popen("./ey_or.elf", stdin=subprocess.PIPE, stdout=subprocess.PIPE)
for x in s:
p.stdin.write(str(x) + '\n')
p.stdin.close()
print p.stdout.read()

得到flag。