We all have secrets to keep. Those secrets could be personal dirt we want to keep from others, or they could be something as mundane as our credit card numbers or medical histories. But all of us have ...

This was one of the most secure hand ciphers used in the Second World War. It was used by both the Allies and the Axis, and served both well. Its main weakness was that if the attacker intercepted two ...

It’s been a couple of Math Mondays since we last looked at columnar transposition ciphers, so let’s jump back in. In the It’s been a couple of Math Mondays since we last looked at columnar ...

Classical Cipher Structure Trainer は、古典暗号を構成する2大要素**「換字（Substitution）」と「転置（Transposition）」** を、マッピング（対応表）と シャッフル（並べ替え） という直感的概念で学べる教育ツールです。 古典暗号の仕組みを図解と体験的UIで理解し ...

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