#corctf2021 from random import randrange from secrets import flag, key from Crypto.Util.number import long_to_bytes def bsum(state, taps, l): ret = 0 for i in taps: ret ^= (state >> (l - i)) return ret & 1 class Gen: def __init__(self, key…

#TSGCTF_2021 from mpmath import mp, power, ln import json mp.dps = 1000000000 def decode(enc): return int(power(2, enc * ln(2))) s, e = json.load(open('encoded.json')) flag = decode(s << e) print(flag.to_bytes((flag.bit_length() + 7) // 8,…