Caesar Cipher Examples
These Caesar cipher examples match Cipher Portal’s implementation. Copy each triple into Cipher Portal or study the decoder guide first.
Example 1: shift 3 (classic)
Plaintext HELLO with shift 3 becomes KHOOR. Each letter moves forward three places. Decrypt KHOOR with shift 3 to recover HELLO.
Example 2: ROT13
Shift 13 is self-inverse for letters A–Z. Encrypting HELLO gives URYYB; encrypting URYYB again returns HELLO. Puzzle sites use ROT13 to hide spoilers.
Example 3: key recovery
Given ciphertext KHOOR without the key, a brute-force decoder tests shifts 0–25 and ranks HELLO highest for English scoring. Try this in the Frequency Analysis Lab.
Verify in Cipher Portal
Open the homepage tool, choose Caesar, paste each example, and toggle Encrypt versus Decrypt to confirm the triple. If ciphertext came from a puzzle without a stated shift, enable key recovery on decrypt with an empty shift field and compare the ranked output to the examples above.
For classroom worksheets, publish only ciphertext and ask students to recover the shift manually first, then check with the portal. Pair drills with the Caesar cipher cracker guide when the shift is unknown.
- Plaintext
- HELLO
- Key (shift)
- 3
- Ciphertext
- KHOOR
Frequently asked questions
What is the most common Caesar example?
HELLO → KHOOR with shift 3 appears in textbooks and online demos.
How do I verify an example?
Paste values into Cipher Portal with cipher Caesar and matching encrypt/decrypt mode.
Where are more cipher samples?
See the general /examples.html page and other cipher family example pages in this cluster.
Does punctuation encrypt?
Portal Caesar typically preserves non-letters; examples here use A–Z words.