WebMar 27, 2024 · 1. LCG - Basis Sn + 1 ≡ aSn + b(mod m) S0 Fm gcd(a, m) = 1 T = ordm(a) S0 = Sbad Sn + 1 ≡ aSn + b(mod m) s0, s1, s2 Fm E m → m ⋅ r[2] = a( − a), m ⋅ r[3] = b( − b) {kiN} ki FN ∵ ki 1 pn ∴ Tn = Sn + 1 − Sn Tn + 1 = Sn + 2 − Sn + 1 = a(Sn + 1 − Sn) = aTn(mod m) Tn + 2 = Sn + 3 − Sn + 2 = a(Sn + 2 − Sn + 1) = aTn + 1 = a2Tn(mod m)

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There are a total of 12 crypto problems in this CTF, and I solved all of them except 'fried_rice'. I'm going to breifly explain the easier … See more WebIt is a quite simple PRNG: it consists of two LCG combined with xor. We can guess the first few values and then attack the PRNG to recover the seed and predict next outputs. The … WebTo demonstrate this to the incredulous, generate a million values using the LCG in the question; count how many times each of the 32768 values is reached; and either compute the standard deviation of that, or graph the … inc bow flat sandals blue