Description: This image seems wrong.....did Keith lose the key again? We first get a file with png extension which is unable to open as a png file. Then we output the hex data, and we can find that there are no png signature '89 50 4E 47 0…

既知平文攻撃とは？What's the known-plaintext attack? Wikipedia definition: The known-plaintext attack (KPA) is an attack model for cryptanalysis where the attacker has access to both the plaintext (called a crib), and its encrypted version…

Python: def exgcd(m, n): if n>0: y,x,d = exgcd(n, m%n) return x, y-m/n*x, d else: return 1, 0, m N = 97139961312384239075080721131188244842051515305572003521287545456189235939577 E = 65537 C = 7736145512745599657240445122140151014557577623…

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シーザー暗号をデコードする方法まとめ 1.ファイルから読み込み （Python） ---------------------------------------------------------------- print "".join([chr(ord(c)-10) for c in open("[-- YOUR FILE NAME --]", "rb").read()]) ------------------…