SimpleMachine - xfiles xp0int Posted on Feb 11 2020 ``` Codegate CTF 2020 Preliminary Challenge : SimpleMachine Description : (fixed-point challenge) Classic Check Flag Challenge Machine DOWNLOAD : http://ctf.codegate.org/099ef54feeff0c4e7c2e4c7dfd7deb6e/116ea16dbeabe08d1fe8891a27d0f16b point : 333 (80 team solved) ``` ## 说明 ## 脚本 ``` from pwn import * stage1 = [0xb0bd, 0xbabc, 0xbeb9, 0xbaac, 0xcfce, 0xcfce] stage2 = [0xf974, 0x2b9d, 0x4caf, 0xbee1, 0xfc0d, 0x6e48, 0xe03c, 0xd322, 0x1979, 0x36d6, 0x40e8, 0xcbf7] val = 0xdead flag = '' for i in stage1: flag += p16((0x10000 - i)) next = lambda x:x ^ ((x << 1) & 0xffff) for i in stage2: val = next(val) flag += p16((0x10000 - i) ^ val) # CODEGATE2020{ezpz_but_1t_1s_pr3t3xt} print flag ``` 打赏还是打残，这是个问题 赏 Wechat Pay Alipay [Crypto] Halffeed - xfiles [Misc] ENIGMA - eFno
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