Lesson 2 - Combination Ciphers
Key topics:
- Using 3-4 ciphers in a row on the plaintext using CC1 ciphers.
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The following 7 codes from CC1 will be used in this assignment. Click the link to go to the lesson if you need a refresher.
Lesson 1
Atbash Cipher (A-->Z, B-->Y, C-->X, etc)
Caesar Cipher (Shift the alphabet along)
Pigpen
Lesson 2
Vigenere Cipher (Uses a keyword)
Lesson 3
Rail-fence Cipher (Transposition)
Columnar Cipher (Transposition, requires keyword)
Lesson 4
Playfair Cipher (Best explained in the lesson >_>, requires keyword)
Lesson 1
Atbash Cipher (A-->Z, B-->Y, C-->X, etc)
Caesar Cipher (Shift the alphabet along)
Pigpen
Lesson 2
Vigenere Cipher (Uses a keyword)
Lesson 3
Rail-fence Cipher (Transposition)
Columnar Cipher (Transposition, requires keyword)
Lesson 4
Playfair Cipher (Best explained in the lesson >_>, requires keyword)
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Assignment 2
- Due: end of 31st May 2012
- All work is OPTIONAL (of the optional work you must complete any 10 questions for full points - see the Points Breakdown for more details)
- Up to 50 points total.
- Complete either one or both questions. If you want to only do one question to start and another later that's fine, you can send them separately. However, please do send each question fully completed (i.e. I don't want Q1A in one e-mail and Q1B in another).
- Send to: [email protected]
- E-mail subject: CC2-2-HOL ID (replace HOL ID with your HOL ID, for example I could put: CC2-2-ma607)
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Q1. (25 points total)
The plaintext was encoded to give the ciphertext in the following order:
The ciphertext is as follows:
JILUAF UHHKDK OMDGWV GLWHGH VNDRUT AWIUNU OBZDBA
Find the plaintext....(make sure to remember to decode in reverse order!). Please include the ciphertext at the end of each decoding stage in your e-mail.
Q2. (25 points total)
The plaintext was encoded to give the ciphertext in the following order:
The ciphertext is as follows:
The plaintext was encoded to give the ciphertext in the following order:
- Plaintext
- Playfair cipher (keyword - wisdom - see image below assignment)
- Atbash cipher
- Columnar cipher (keyword - english [= 1625473])
- Ciphertext
The ciphertext is as follows:
JILUAF UHHKDK OMDGWV GLWHGH VNDRUT AWIUNU OBZDBA
Find the plaintext....(make sure to remember to decode in reverse order!). Please include the ciphertext at the end of each decoding stage in your e-mail.
Q2. (25 points total)
The plaintext was encoded to give the ciphertext in the following order:
- Plaintext
- Rail-fence cipher (6 rows, see image below)
- Vigenere cipher (keyword: Wilde, http://sharkysoft.com/misc/vigenere/)
- Caesar cipher (shift of 5, http://www.simonsingh.net/The_Black_Chamber/caesar.html)
- Pigpen
- Ciphertext
The ciphertext is as follows:
Find the plaintext....(make sure to remember to decode in reverse order!) Please include the ciphertext at the end of each decoding stage in your e-mail.
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