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Cipher Decoding - Intermediate Level: encryption patterns INTERMEDIATE

Quick mental agility ★ session: 20 intermediate-level cipher decoding questions. Worksheet 17 of 30 - Focus: encryption patterns. Practice shift ciphers, substitution ciphers, transposition ciphers with instant feedback. Great for mid-level students needing moderate complexity with mixed patterns practice.

📝 Worksheet 17 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate level

What you'll learn in this worksheet:
Your progress through Cipher Decoding
Worksheet 17 of 30 (56% complete)

Question 1

Using Playfair cipher with keyword 'PLAYFAIR', encode: 'ALGORITHM'
Playfair with keyword 'PLAYFAIR': ALGORITHM → YAOVBRQMKZ
playfair, digraph

Question 2

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

Question 3

Using ROT13 cipher, decode: 'DECRYPT'
ROT13 (shift 13): DECRYPT → QRPELCG
rot13, rotation

Question 4

Using book cipher with 'The Quick Brown Fox' [THE, QUICK, BROWN, FOX, JUMPS, OVER, THE...] (5 pages, 9 words), decode positions: (pg4, w1), (pg2, w6), (pg2, w6)
Position decoding: THE OVER OVER
book, position

Question 5

Using Baconian cipher (5-bit binary encoding), decode: '10010 01000 10010 10011 00100 10001'
Baconian decoding: 10010 01000 10010 10011 00100 10001 → SISTER
baconian, binary

Question 6

Using Playfair cipher with keyword 'PYTHON', encode: 'LION'
Playfair with keyword 'PYTHON': LION → REPD
playfair, digraph

Question 7

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

Question 8

Using Autokey cipher with initial key 'ENIGMA', encode: 'JUSTICE'
Autokey cipher: JUSTICE with key 'ENIGMA' → NHAZUCN
autokey, vigenere

Question 9

Using Baconian cipher (5-bit binary encoding), decode: '00111 00100 01011 01011 01110'
Baconian decoding: 00111 00100 01011 01011 01110 → HELLO
baconian, binary

Question 10

Using keyboard shift cipher (shift left on QWERTY), encode: 'MONKEY'
Keyboard shift (left): MONKEY → NIBJWT
keyboard, qwerty

Question 11

Using date-based cipher with date 28-11-2000 (sum of day+month+year = 11), decode: 'DEZCLRP'
Date-based cipher: Shift = 11, DEZCLRP decoded → STORAGE
date, calendar

Question 12

Using Columnar Transposition cipher with key 'CODE', encode: 'FIREWALL'
Columnar Transposition with key 'CODE': FIREWALL → FWRLELIA
transposition, columnar

Question 13

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

Question 14

Using Columnar Transposition cipher with key 'CODE', encode: 'MESSAGE'
Columnar Transposition with key 'CODE': MESSAGE → MASESEG
transposition, columnar

Question 15

Using date-based cipher with date 12-06-2013 (sum of day+month+year = 3), decode: 'FRGH'
Date-based cipher: Shift = 3, FRGH decoded → CODE
date, calendar

Question 16

Using date-based cipher with date 06-05-2012 (sum of day+month+year = 21), decode: 'ZIXMTKO'
Date-based cipher: Shift = 21, ZIXMTKO decoded → ENCRYPT
date, calendar

Question 17

Using Vigenère cipher with keyword 'WHALE', decode the ciphertext: 'YYAQX'
Vigenère: With key 'WHALE', YYAQX → CRAFT
vigenere, polyalphabetic

Question 18

Using Playfair cipher with keyword 'CIPHER', encode: 'PURPLE'
Playfair with keyword 'CIPHER': PURPLE → ESBCNP
playfair, digraph

Question 19

Using Vigenère cipher with keyword 'LIZARD', decode the ciphertext: 'OQEFZFFTS'
Vigenère: With key 'LIZARD', OQEFZFFTS → DIFFICULT
vigenere, polyalphabetic

Question 20

Using date-based cipher with date 19-10-2000 (sum of day+month+year = 1), decode: 'HBMBYZ'
Date-based cipher: Shift = 1, HBMBYZ decoded → GALAXY
date, calendar
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