Created
April 8, 2021 04:29
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def xorBytes(b1, b2): | |
res = b"" | |
for i in range(max(len(b1), len(b2))): | |
res += bytes([b1[i % len(b1)] ^ b2[i % len(b2)]]) | |
return res | |
crib = b"actf{" | |
ctext = bytes.fromhex("ae27eb3a148c3cf031079921ea3315cd27eb7d02882bf724169921eb3a469920e07d0b883bf63c018869a5090e8868e331078a68ec2e468c2bf13b1d9a20ea0208882de12e398c2df60211852deb021f823dda35079b2dda25099f35ab7d218227e17d0a982bee7d098368f13503cd27f135039f68e62f1f9d3cea7c") | |
for i in range(len(ctext) - 5): | |
offset = ctext[i: i + 5] | |
key = xorBytes(offset, crib) | |
try: | |
print(xorBytes(key, ctext[i:]).decode()) | |
except: | |
continue |
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