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Cipher Decoding - Advanced Level: atbash cipher ADVANCED

Quick competitive exam prep session: 20 advanced-level cipher decoding questions. Worksheet 27 of 30 - Focus: atbash cipher. Practice key-based decoding, cipher algorithms, secret codes with instant feedback. Great for advanced students needing complex scenarios and multi-step problems practice.

📝 Worksheet 27 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Advanced level

What you'll learn in this worksheet:
Your progress through Cipher Decoding
Worksheet 27 of 30 (90% complete)

Question 1

Using the same Caesar cipher that encodes 'SQL' as 'BZU', decode: 'NUNLCARLRCH'
Shift = 9. NUNLCARLRCH decoded (shift -9) = ELECTRICITY
caesar, shift

Question 2

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

Question 3

Using Columnar Transposition cipher with key 'CIPHER', encode: 'LIBERTY'
Columnar Transposition with key 'CIPHER': LIBERTY → LYREIBT
transposition, columnar

Question 4

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

Question 5

Using Columnar Transposition cipher with key 'KEY', encode: 'JUNGLE'
Columnar Transposition with key 'KEY': JUNGLE → ULJGNE
transposition, columnar

Question 6

Using Autokey cipher with initial key 'CODE', encode: 'JAVA'
Autokey cipher: JAVA with key 'CODE' → LOYE
autokey, vigenere

Question 7

Decode the hexadecimal string: '4D455353414745'
Hex decoding: 4D455353414745 → MESSAGE
base64, hex, encoding

Question 8

Using Rail Fence cipher with 3 rails, encode: 'VARIABLE'
Rail Fence (3 rails): VARIABLE → VAAIBERL
railfence, transposition

Question 9

Using Columnar Transposition cipher with key 'ENIGMA', encode: 'PROTOCOL'
Columnar Transposition with key 'ENIGMA': PROTOCOL → CPOTOORL
transposition, columnar

Question 10

Using Baconian cipher (5-bit binary encoding), decode: '00010 01110 01100 00100 10011'
Baconian decoding: 00010 01110 01100 00100 10011 → COMET
baconian, binary

Question 11

Using keyword cipher with keyword 'CODE', decode: 'FNE'
Cipher alphabet: CODEABFGHIJKLMNPQRSTUVWXYZ
Decoding FNE → GOD
keyword, substitution

Question 12

Decode the Base64 string: 'UFJPQ0VTU09S'
Base64 decoding: UFJPQ0VTU09S → PROCESSOR
base64, hex, encoding

Question 13

Using date-based cipher with date 28-06-2016 (sum of day+month+year = 22), decode: 'NERAN'
Date-based cipher: Shift = 22, NERAN decoded → RIVER
date, calendar

Question 14

Using Hill cipher with key matrix [[5, 8], [3, 5]], encode: 'COMET'
Hill cipher: COMET → SYOETQ
hill, matrix

Question 15

Using the same Caesar cipher that encodes 'GO' as 'OW', decode: 'LWKSMZ'
Shift = 8. LWKSMZ decoded (shift -8) = DOCKER
caesar, shift

Question 16

Using book cipher with 'I Have A Dream' [FREEDOM, JUSTICE, EQUALITY, DREAM, HOPE, RIGHTS, COLOR...] (4 pages, 10 words), decode positions: (pg1, w6), (pg1, w2), (pg1, w7)
Position decoding: RIGHTS JUSTICE COLOR
book, position

Question 17

Using date-based cipher with date 02-04-2009 (sum of day+month+year = 13), decode: 'VFYNAQ'
Date-based cipher: Shift = 13, VFYNAQ decoded → ISLAND
date, calendar

Question 18

Using Rail Fence cipher with 5 rails, encode: 'CARBON'
Rail Fence (5 rails): CARBON → CARBNO
railfence, transposition

Question 19

Using keyword cipher with keyword 'UNIVERSE', encode: 'BOTTOM'
Cipher alphabet: UNIVERSABCDFGHJKLMOPQTWXYZ
BOTTOM → NJPPJG
keyword, substitution

Question 20

Using ROT13 cipher, decode: 'STATISTICS'
ROT13 (shift 13): STATISTICS → FGNGVFGVPF
rot13, rotation
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