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Simple Cyphers / Chiffre / Cifrar / Zifratu / Coderen / बीजलेख / κρυπτογραφία

• The Atbash Cypher isn't very well known, but well worth studying.
• Rot 13 Cypher Probably the simplest cypher in existance.
• Caesar's Cypher Simple, but many variations to play with.
• Text Mirroring barely counts as a cypher, but can be fun.
• Mulenere Cypher Encoder/Decoder
• The Pendulum Cypher is a favourite of puzzle books.
• Vernam's Cypher is one of the classic ways of encoding a secret.
• Hex-Pair Encoding is a close relative of both hexadecimal notation and of Base-64 encoding.
• Twin-Hex Encodingis one of the most secure simple cyphers available.
• The First-Letter Decoder is great for the kind of 'code' you see in the movies, where a message has been hidden in plain sight.
• Convert to or from Character Codes either as Decimal, Hex or Binary
• Letter Frequency Analyzer
• An introduction to One-Time Pads