Julius Caesar (100 BC – 44 BC) is said to have invented these for his secret communications with his generals. He shifted secret messages three letters along.
A to D, B to E, C to F … simple, see?
Our Verdict: Far too simple – no wonder he was assassinated
To make these ciphers harder, you can shift forwards or backwards any number of spaces.
Our Verdict: Simple, easy – still not very safe
Top tip: to improve safety, change the shift each time
JCC Entrance Test: Caesar Cipher
YNU DWRKY WJZ HAP OHEL PDA ZKCO KB SWN
Decoded it? It’s a quotation.
Status: JCC Bronze Level Cracker
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If you like these why not try Advanced Caesar Ciphers?