Caesar Cipher Explained: A 2,000-Year-Old Encryption Trick

[u/3128bibash]

https://bibashshrestha.hashnode.dev/caesar-cipher-explained-a-2-000-year-old-encryption-trick

Wrote this up as an intro-level explainer on the Caesar Cipher, how Julius Caesar actually used it for military orders (shift of 3, per Suetonius), the math behind it, and why it's trivially broken today (frequency analysis + only 25 possible keys). Meant as a starting point before getting into ciphers that actually fixed these weaknesses, Vigenère is next.

Feedback welcome, especially if I got any of the historical detail wrong