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Cipher Decoding - Beginner-Intermediate Level: caesar cipher BEGINNER-INTERMEDIATE

This deep dive ★ worksheet contains 20 beginner-intermediate-level cipher decoding problems. Worksheet 11 of 30 focuses on caesar cipher. Practice substitution ciphers, transposition ciphers, key-based decoding with our step-by-step solutions. Difficulty: building on fundamentals with moderate challenges. Recommended for developing learners.

📝 Worksheet 11 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Beginner-intermediate level

What you'll learn in this worksheet:
Your progress through Cipher Decoding
Worksheet 11 of 30 (36% complete)

Question 1

Decode the Base64 string: 'QkFTRTY0'
Base64 decoding: QkFTRTY0 → BASE64
base64, hex, encoding

Question 2

Using date-based cipher with date 01-09-2011 (sum of day+month+year = 19), decode: 'IRMAHG'
Date-based cipher: Shift = 19, IRMAHG decoded → PYTHON
date, calendar

Question 3

Using Rail Fence cipher with 2 rails, encode: 'STAR'
Rail Fence (2 rails): STAR → SATR
railfence, transposition

Question 4

Using Baconian cipher (5-bit binary encoding), decode: '00011 01110 01011 01111 00111 01000 01101'
Baconian decoding: 00011 01110 01011 01111 00111 01000 01101 → DOLPHIN
baconian, binary

Question 5

Decode the Base64 string: 'V09STEQ='
Base64 decoding: V09STEQ= → WORLD
base64, hex, encoding

Question 6

Using Baconian cipher (5-bit binary encoding), decode: '01000 10010 01011 00000 01101 00011'
Baconian decoding: 01000 10010 01011 00000 01101 00011 → ISLAND
baconian, binary

Question 7

Using Baconian cipher (5-bit binary encoding), decode: '01011 01000 01110 01101'
Baconian decoding: 01011 01000 01110 01101 → LION
baconian, binary

Question 8

Using book cipher with 'The Quick Brown Fox' [THE, QUICK, BROWN, FOX, JUMPS, OVER, THE...] (5 pages, 9 words), decode positions: (pg4, w3), (pg4, w2), (pg1, w6), (pg1, w3)
Position decoding: BROWN QUICK OVER BROWN
book, position

Question 9

In Morse code, what does '.-. .- -... -... .. -' represent?
Morse decoding: RABBIT → .-. .- -... -... .. -
morse, dots-dashes

Question 10

In Morse code, what does '.-.. .. --. .... -' represent?
Morse decoding: LIGHT → .-.. .. --. .... -
morse, dots-dashes

Question 11

Decode the hexadecimal string: '41555448454E5449434154494F4E'
Hex decoding: 41555448454E5449434154494F4E → AUTHENTICATION
base64, hex, encoding

Question 12

Using date-based cipher with date 05-02-2027 (sum of day+month+year = 6), decode: 'SUATZGOT'
Date-based cipher: Shift = 6, SUATZGOT decoded → MOUNTAIN
date, calendar

Question 13

Using ROT13 cipher, decode: 'DESERT'
ROT13 (shift 13): DESERT → QRFREG
rot13, rotation

Question 14

Using Columnar Transposition cipher with key 'LOCK', encode: 'DESERT'
Columnar Transposition with key 'LOCK': DESERT → SEDRET
transposition, columnar

Question 15

In Morse code, what does '-.- .. -.-. -.-' represent?
Morse decoding: KICK → -.- .. -.-. -.-
morse, dots-dashes

Question 16

Using reverse cipher (writing backwards), decode: 'NIOCTIB'
Reverse cipher: NIOCTIB reversed is BITCOIN
reverse, backwards

Question 17

Using keyword cipher with keyword 'AUTHENTICATION', decode: 'FKR'
Cipher alphabet: AUTHENICOBDFGJKLMPQRSVWXYZ
Decoding FKR → LOT
keyword, substitution

Question 18

Using Columnar Transposition cipher with key 'SECRET', encode: 'MARKETING'
Columnar Transposition with key 'SECRET': MARKETING → RGANEKMIT
transposition, columnar

Question 19

Using keyboard shift cipher (shift right on QWERTY), encode: 'LIBERTY'
Keyboard shift (right): LIBERTY → AONRTYU
keyboard, qwerty

Question 20

Using keyword cipher with keyword 'CERTIFICATE', decode: 'TCT'
Cipher alphabet: CERTIFABDGHJKLMNOPQSUVWXYZ
Decoding TCT → DAD
keyword, substitution
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