Caesar Cipher Worksheet
Shift every letter forward by 3 (A becomes D, B becomes E)
- Grades 4–8
- 20 minutes
- Intermediate
- 8 exercises
- Answer key included
The Caesar cipher shifts every letter a fixed number of places along the alphabet — this worksheet uses the classic shift of 3 that Julius Caesar reportedly used. Students encrypt words by moving each letter forward three positions and decrypt by moving back. Print the student PDF and answer key below, or solve the exercises on this page.
Printable PDF — free to download & print
How to use this worksheet
The Caesar cipher shifts each letter a fixed number of places along the alphabet. This worksheet uses a shift of 3 (A becomes D, B becomes E, and Z wraps to C). To decode, shift back by 3.
Exercises
- 1. Encrypt (shift 3): CAT
- 2. Encrypt (shift 3): DOG
- 3. Encrypt (shift 3): HELLO
- 4. Encrypt (shift 3): SECRET
- 5. Decrypt (shift 3): KHOOR
- 6. Decrypt (shift 3): VSB
- 7. Decrypt (shift 3): DWWDFN
- 8. Decode the agent message (shift 3): DWWDFN DW GDZQ
Full solutions are on the downloadable answer key (PDF).