Caesar-Chiffre

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Jeder Buchstabe wird um eine feste Anzahl von Positionen im Alphabet verschoben.

The Caesar cipher shifts each letter by a fixed number of positions. If the shift is 3, A becomes D, B becomes E, and so on. At the end of the alphabet, it wraps around: X→A, Y→B, Z→C (with shift 3). Named after Julius Caesar who reportedly used a shift of 3 for military messages.

Shifted letter = (Original position + Shift) mod 26. With shift=3: A→D, B→E, C→F, ..., X→A, Y→B, Z→C

• Shift 1: CAT → DBU
• Shift 3: HELLO → KHOOR
• Shift 5: APPLE → FUUQJ

So erkennen Sie es

• All letters shifted by the same amount
• Key shows consistent pattern (A→D, B→E means shift 3)
• Wraps around at Z back to A

Häufige Fehler

• Forgetting to wrap around (Y+3 should be B, not beyond Z)
• Shifting in the wrong direction for decoding
• Not identifying the shift value from given examples

Übungshinweise

Kodierung und Dekodierung