Assignment 2 - HW (30 points) & EC (30 points)
Due: October 31st 2012
Send your completed assignments to: [email protected]
DO NOT SEND ATTACHMENTS. DO NOT SEND BEFORE OCTOBER 1ST. I reserve the right to change the homework up until that date *g*
Please send the HW and EC in separate emails where possible. For HW you can pick any questions you would like (up to 30 points total). For EC please do 30 points more (only 60 points worth of work total will be graded). This means you do not have to do every question.
The subject of your e-mail should have the following format: CC1 - HW2 - HOL ID (for homework) and CC1 - EC2 - HOL ID (for EC). For example, for my student ID this would read: CC1 - HW2 - ma607 or CC1 - EC2 - ma607
If you require help / further hints as to where to go with the HW feel free to contact me (email/IRC/HOL message). This will not incur a points penalty, however obviously it will take me a bit of time to respond (ideally within a week) - please take this into account when working out if you need an extension :)
Send your completed assignments to: [email protected]
DO NOT SEND ATTACHMENTS. DO NOT SEND BEFORE OCTOBER 1ST. I reserve the right to change the homework up until that date *g*
Please send the HW and EC in separate emails where possible. For HW you can pick any questions you would like (up to 30 points total). For EC please do 30 points more (only 60 points worth of work total will be graded). This means you do not have to do every question.
The subject of your e-mail should have the following format: CC1 - HW2 - HOL ID (for homework) and CC1 - EC2 - HOL ID (for EC). For example, for my student ID this would read: CC1 - HW2 - ma607 or CC1 - EC2 - ma607
If you require help / further hints as to where to go with the HW feel free to contact me (email/IRC/HOL message). This will not incur a points penalty, however obviously it will take me a bit of time to respond (ideally within a week) - please take this into account when working out if you need an extension :)
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Q1. (20 points - 10 for encryption, 10 for decoding)
Forum work - Vigenere cipher. (*CLICK HERE*)
Decode the message from the previous post and encode your own message (please state the keyword you used).
You may encode a quote or lyrics or any random message you want, it should be around 25 characters long. Please include a link to your post in your e-mail if you choose this question :)
Q2. (20 points - 10 for encryption, 10 for decoding)
Forum work - Combination ciphers. (*CLICK HERE*)
Create your plaintext and use a combination of ciphers on it, as discussed in the lesson. You can either "combine 2 ciphers into one" or "apply cipher 1 then cipher 2." On the forum decode the previous message and post your own (stating what cipher you used). Please include a link to your post in your e-mail if you choose this question :)
Q3. (10 points)
Frequency Analysis. The following text has been encrypted using a Caesar cipher.
IWXH TKXA RPCCDI QT RDCRTPATS QN IWT EDLTG DU IWT TAKTH. LT SD CDI WPKT IWT HIGTCVIW ID LXIWHIPCS QDIW BDGSDG PCS XHTCVPGS. VPCSPAU, IWT GXCV RPCCDI HIPN WTGT. IWXH TKXA QTADCVH ID PAA DU BXSSAT-TPGIW. IWTN BJHI STRXST CDL WDL ID TCS XI. IWT IXBT DU IWT TAKTH XH DKTG, BN ETDEAT PGT ATPKXCV IWTHT HWDGTH. LWD LXAA NDJ ADDZ ID LWTC LT'KT VDCT? IWT SLPGKTH? IWTN IDXA PLPN XC RPKTGCH, HTTZXCV GXRWTH. IWTN RPGT CDIWXCV UDG IWT IGDJQATH DU DIWTGH.
a) You can enter the ciphertext above onto THIS SITE to see a frequency analysis. Scroll down to where it says "Enter your ciphertext below" and paste the above ciphertext. Then click "submit" Use this to help you identify what the shift is by looking at the most common letters. I'd like you to explain your initial thoughts and reasoning from looking at the frequency chart as to what the shift is likely to be. (The most common letters in the English language - i.e. before they're shifted - are E, T, R, N, I and A).
b) You are then welcome to use THIS PAGE to decipher the entire text. The "Number of lines" represents the shift, so you can 100% decipher it fine this way just by trial and error! Just past the cipher text in the ciphertext box and hit "decipher" for each "Number of lines." State what the actual shift was (i.e. Plaintext A = Ciphertext ??) and which character & movie series the entire quote comes from.
If for some reason the links above don't work let me know and I'll try to find another link for you :)
Q4. (10 points)
Decode the following ciphertext. They were encoded using two ciphers from the lesson (the ones with the keywords LETO and FOX). One cipher was used on ONE part of the text, the other cipher was used on the OTHER part - i.e. each part of the plaintext was only encrypted with one cipher. I'm not telling you where the split is, but it should be fairly obvious when you start hitting gibberish :)
CNELTHSNSDARDLKONWXRYVJBNNQRWSBVV
Q5. (10 points)
Decode the following ciphertext - 2 ciphers were applied, 1 after the other. Obviously remembering lesson 1 is a good place to start ;)
Forum work - Vigenere cipher. (*CLICK HERE*)
Decode the message from the previous post and encode your own message (please state the keyword you used).
You may encode a quote or lyrics or any random message you want, it should be around 25 characters long. Please include a link to your post in your e-mail if you choose this question :)
Q2. (20 points - 10 for encryption, 10 for decoding)
Forum work - Combination ciphers. (*CLICK HERE*)
Create your plaintext and use a combination of ciphers on it, as discussed in the lesson. You can either "combine 2 ciphers into one" or "apply cipher 1 then cipher 2." On the forum decode the previous message and post your own (stating what cipher you used). Please include a link to your post in your e-mail if you choose this question :)
Q3. (10 points)
Frequency Analysis. The following text has been encrypted using a Caesar cipher.
IWXH TKXA RPCCDI QT RDCRTPATS QN IWT EDLTG DU IWT TAKTH. LT SD CDI WPKT IWT HIGTCVIW ID LXIWHIPCS QDIW BDGSDG PCS XHTCVPGS. VPCSPAU, IWT GXCV RPCCDI HIPN WTGT. IWXH TKXA QTADCVH ID PAA DU BXSSAT-TPGIW. IWTN BJHI STRXST CDL WDL ID TCS XI. IWT IXBT DU IWT TAKTH XH DKTG, BN ETDEAT PGT ATPKXCV IWTHT HWDGTH. LWD LXAA NDJ ADDZ ID LWTC LT'KT VDCT? IWT SLPGKTH? IWTN IDXA PLPN XC RPKTGCH, HTTZXCV GXRWTH. IWTN RPGT CDIWXCV UDG IWT IGDJQATH DU DIWTGH.
a) You can enter the ciphertext above onto THIS SITE to see a frequency analysis. Scroll down to where it says "Enter your ciphertext below" and paste the above ciphertext. Then click "submit" Use this to help you identify what the shift is by looking at the most common letters. I'd like you to explain your initial thoughts and reasoning from looking at the frequency chart as to what the shift is likely to be. (The most common letters in the English language - i.e. before they're shifted - are E, T, R, N, I and A).
b) You are then welcome to use THIS PAGE to decipher the entire text. The "Number of lines" represents the shift, so you can 100% decipher it fine this way just by trial and error! Just past the cipher text in the ciphertext box and hit "decipher" for each "Number of lines." State what the actual shift was (i.e. Plaintext A = Ciphertext ??) and which character & movie series the entire quote comes from.
If for some reason the links above don't work let me know and I'll try to find another link for you :)
Q4. (10 points)
Decode the following ciphertext. They were encoded using two ciphers from the lesson (the ones with the keywords LETO and FOX). One cipher was used on ONE part of the text, the other cipher was used on the OTHER part - i.e. each part of the plaintext was only encrypted with one cipher. I'm not telling you where the split is, but it should be fairly obvious when you start hitting gibberish :)
CNELTHSNSDARDLKONWXRYVJBNNQRWSBVV
Q5. (10 points)
Decode the following ciphertext - 2 ciphers were applied, 1 after the other. Obviously remembering lesson 1 is a good place to start ;)
Q6. (10 points)
Decode the following ciphertext. It was encoded using a Vigenere cipher with the keyword "TARDIS." Please split the plaintext into words.
MHVHGWLOWDPSPKRQLLAEVDZKHFRIWP
Decode the following ciphertext. It was encoded using a Vigenere cipher with the keyword "TARDIS." Please split the plaintext into words.
MHVHGWLOWDPSPKRQLLAEVDZKHFRIWP