Created
February 22, 2021 03:19
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darkCON CTF 2021 - Too Much [ RE ]
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from z3 import * | |
a = [BitVec("x{}".format(i), 8) for i in range(200)] | |
arr=[70, 22, 39, 182, 52, 244, 228, 183, 67, 39, 51, 245, 151, 3, 87, 245, 39, 51, 67, 198, 198, 151, 245, 71, 134, 19, 230, 182, 19, 230, 147, 245, 71, 134, 67, 71, 245, 151, 3, 87, 245, 54, 67, 230, 245, 71, 39, 151, 245, 71, 134, 19, 83, 245, 214, 67, 230, 87, 67, 198, 198, 151, 243, 243, 243, 245, 244, 182, 245, 148, 245, 71, 134, 19, 230, 182, 245, 151, 3, 87, 245, 38, 51, 71, 71, 51, 39, 245, 87, 55, 51, 245, 55, 3, 214, 51, 245, 22, 87, 71, 3, 214, 67, 71, 51, 70, 245, 71, 3, 3, 198, 55, 245, 198, 19, 182, 51, 245, 67, 230, 147, 39, 245, 3, 39, 245, 165, 51, 245, 71, 3, 245, 214, 67, 182, 51, 245, 151, 3, 87, 39, 245, 198, 19, 102, 51, 245, 214, 87, 54, 134, 245, 86, 67, 55, 19, 51, 39, 226, 52, 3, 230, 118, 39, 67, 71, 55, 245, 102, 3, 39, 245, 55, 3, 198, 103, 19, 150, 230, 147, 245, 71, 134, 51, 245, 86, 67, 55, 151, 245, 54, 134, 67, 198, 198, 51, 230, 118, 51, 215] | |
s=Solver() | |
for i in range(200): | |
eval("s.add((16 * a["+str(i)+"]) + (a["+str(i)+"] >> 4) == "+str(arr[i])+")") | |
s.check() | |
model=s.model() | |
flag="" | |
for i in a: | |
flag+=chr(model[i].as_long()) | |
print(flag) |
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