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

Quick intensive drill ★ session: 20 beginner-intermediate-level cipher decoding questions. Worksheet 7 of 30 - Focus: cipher algorithms. Practice cipher algorithms, secret codes, military codes with instant feedback. Great for developing students needing building on fundamentals with moderate challenges practice.

📝 Worksheet 7 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Beginner-intermediate level

What you'll learn in this worksheet:
Your progress through Cipher Decoding
Worksheet 7 of 30 (23% complete)

Question 1

Using date-based cipher with date 23-02-2007 (sum of day+month+year = 4), decode: 'VMZIV'
Date-based cipher: Shift = 4, VMZIV decoded → RIVER
date, calendar

Question 2

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

Question 3

Using book cipher with 'Macbeth' [MACBETH, LADY, DAGGER, THANE, PROPHECY, GUILT, MURDER...] (6 pages, 10 words), decode positions: (pg6, w5), (pg5, w8), (pg3, w7)
Position decoding: PROPHECY KING MURDER
book, position

Question 4

Using Baconian cipher (5-bit binary encoding), decode: '00000 10010 10011 00100 10001 01110 01000 00011'
Baconian decoding: 00000 10010 10011 00100 10001 01110 01000 00011 → ASTEROID
baconian, binary

Question 5

Using Vigenère cipher with keyword 'CSS', decode the ciphertext: 'HJWGVGO'
Vigenère: With key 'CSS', HJWGVGO → FREEDOM
vigenere, polyalphabetic

Question 6

Decode the hexadecimal string: '50524F544F434F4C'
Hex decoding: 50524F544F434F4C → PROTOCOL
base64, hex, encoding

Question 7

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

Question 8

Using Autokey cipher with initial key 'MYSTERY', encode: 'JUNGLE'
Autokey cipher: JUNGLE with key 'MYSTERY' → VSFZPV
autokey, vigenere

Question 9

Using Autokey cipher with initial key 'MYSTERY', encode: 'FUNCTION'
Autokey cipher: FUNCTION with key 'MYSTERY' → RSFVXZMS
autokey, vigenere

Question 10

Using Autokey cipher with initial key 'MYSTERY', encode: 'HELLO'
Autokey cipher: HELLO with key 'MYSTERY' → TCDES
autokey, vigenere

Question 11

Using Baconian cipher (5-bit binary encoding), decode: '10010 01110 00101 10011 10110 00000 10001 00100'
Baconian decoding: 10010 01110 00101 10011 10110 00000 10001 00100 → SOFTWARE
baconian, binary

Question 12

Using Baconian cipher (5-bit binary encoding), decode: '01001 10100 01101 00110 01011 00100'
Baconian decoding: 01001 10100 01101 00110 01011 00100 → JUNGLE
baconian, binary

Question 13

Using Hill cipher with key matrix [[2, 3], [3, 5]], encode: 'VECTOR'
Hill cipher: VECTOR → CFJXBX
hill, matrix

Question 14

Using Autokey cipher with initial key 'MYSTERY', encode: 'DIFFICULT'
Autokey cipher: DIFFICULT with key 'MYSTERY' → PGXYMTSOB
autokey, vigenere

Question 15

Using book cipher with 'Hamlet' [HAMLET, GHOST, MURDER, REVENGE, MADNESS, TRAGEDY, PRINCE...] (7 pages, 10 words), decode positions: (pg1, w7), (pg6, w2), (pg5, w8)
Position decoding: PRINCE GHOST DENMARK
book, position

Question 16

Using date-based cipher with date 05-01-2028 (sum of day+month+year = 6), decode: 'YULZCGXK'
Date-based cipher: Shift = 6, YULZCGXK decoded → SOFTWARE
date, calendar

Question 17

Using ROT13 cipher, decode: 'ANCIENT'
ROT13 (shift 13): ANCIENT → NAPVRAG
rot13, rotation

Question 18

Using Autokey cipher with initial key 'MYSTERY', encode: 'OCEAN'
Autokey cipher: OCEAN with key 'MYSTERY' → AAWTR
autokey, vigenere

Question 19

Using Autokey cipher with initial key 'CODE', encode: 'MONKEY'
Autokey cipher: MONKEY with key 'CODE' → OCQOQM
autokey, vigenere

Question 20

Using date-based cipher with date 23-05-2027 (sum of day+month+year = 1), decode: 'TFDSFU'
Date-based cipher: Shift = 1, TFDSFU decoded → SECRET
date, calendar
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