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Cipher Decoding - Intermediate Level: cryptography INTERMEDIATE

Master cipher decoding concepts through this excellence pursuit practice set. Worksheet 16 of 30 contains 20 intermediate-level problems. Deep dive into cryptography while learning encryption patterns, shift ciphers, substitution ciphers. Recommended for mid-level learners aiming for moderate complexity with mixed patterns.

📝 Worksheet 16 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate level

What you'll learn in this worksheet:
Your progress through Cipher Decoding
Worksheet 16 of 30 (53% complete)

Question 1

Using Baconian cipher (5-bit binary encoding), decode: '00101 10001 00100 00100 00011 01110 01100'
Baconian decoding: 00101 10001 00100 00100 00011 01110 01100 → FREEDOM
baconian, binary

Question 2

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

Question 3

Using date-based cipher with date 01-08-2023 (sum of day+month+year = 4), decode: 'GSQTYXIV'
Date-based cipher: Shift = 4, GSQTYXIV decoded → COMPUTER
date, calendar

Question 4

Using Atbash cipher (A↔Z, B↔Y, C↔X...), decode: 'AUGMENTED'
Atbash: AUGMENTED → ZFTNVMGVW
atbash, mirror

Question 5

Using the same Caesar cipher that encodes 'KOTLIN' as 'FJOGDI', decode: 'OJMIVYJ'
Shift = 21. OJMIVYJ decoded (shift -21) = TORNADO
caesar, shift

Question 6

If 'SALAD' is encoded as 'YGRGJ' using Caesar cipher, what is the shift value?
Caesar cipher: SALAD → YGRGJ. Shift = 6
caesar, shift

Question 7

Using Columnar Transposition cipher with key 'ENIGMA', encode: 'NETWORK'
Columnar Transposition with key 'ENIGMA': NETWORK → RNKWTOE
transposition, columnar

Question 8

Using Atbash cipher (A↔Z, B↔Y, C↔X...), decode: 'HEALTH'
Atbash: HEALTH → SVZOGS
atbash, mirror

Question 9

Using Rail Fence cipher with 4 rails, encode: 'ZEBRA'
Rail Fence (4 rails): ZEBRA → ZEBAR
railfence, transposition

Question 10

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

Question 11

Using Atbash cipher (A↔Z, B↔Y, C↔X...), decode: 'ARTIFICIAL'
Atbash: ARTIFICIAL → ZIGRURXRZO
atbash, mirror

Question 12

Decode the Base64 string: 'TUVTU0FHRQ=='
Base64 decoding: TUVTU0FHRQ== → MESSAGE
base64, hex, encoding

Question 13

Decode the hexadecimal string: '4D414C57415245'
Hex decoding: 4D414C57415245 → MALWARE
base64, hex, encoding

Question 14

Using Atbash cipher (A↔Z, B↔Y, C↔X...), decode: 'ATOMIC'
Atbash: ATOMIC → ZGLNRX
atbash, mirror

Question 15

Using book cipher with 'Music Notes' [DO, RE, MI, FA, SO, LA, TI...] (4 pages, 10 words), decode positions: (pg1, w2), (pg4, w8)
Position decoding: RE SCALE
book, position

Question 16

Using ROT13 cipher, decode: 'INTERVIEW'
ROT13 (shift 13): INTERVIEW → VAGREIVRJ
rot13, rotation

Question 17

Using Playfair cipher with keyword 'LOCK', encode: 'LION'
Playfair with keyword 'LOCK': LION → OHKI
playfair, digraph

Question 18

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

Question 19

Decode the hexadecimal string: '534543524554'
Hex decoding: 534543524554 → SECRET
base64, hex, encoding

Question 20

Using date-based cipher with date 09-04-2000 (sum of day+month+year = 11), decode: 'PYNCJAE'
Date-based cipher: Shift = 11, PYNCJAE decoded → ENCRYPT
date, calendar
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