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Course: Computer science theory > Unit 2
Lesson 3: Cryptography challenge 101Clue #1
This looks promising...
Luckily you have a friend who works there.
You enter a dark hotel.
Your friend informs you that someone has been checked into room 250 for the past 3 days...they give you a copy of the key
You have 2 minutes...
You run to the waste basket
You are in luck, you have found clue #1, an encrypted message:
Can you break the encryption?
Want to join the conversation?
This is the text for the first clue, in case anybody needs it. gluhtlishjrvbadvyyplkaohavbyjpwolypzavvdlhrvuuleatlzzhnlzdpajoavcpnlulyljpwolyrlfdvykpzaolopkkluzftivsvmklhaoputfmhcvypalovsilpuluk
vwduwljudeehghyhubwklqjlfrxogilqgsohdvhuhwxuqdqbeoxhsulqwviruydxowd qgdodupghvljqedvhgrqzklfkedqnbrxghflghrqldpvhwwlqjxsvdihkrxvhfr(88 votes)
Thank you very much!
You have my upvote and ethernal greetings.(6 votes)
Does anyone have the text for clue 1?(21 votes)
I know the key(using holmes method) but can anyone tell me how to solve it using ka programming. Precisely, how to convert char to int and vice versa. The processing.js has the int() function but it doesn't work on the ka platform.(11 votes)
I don't think I solved it the same way, but here's the program I wrote to solve cesarean shifts. Makes things a lot faster!
https://www.khanacademy.org/cs/frequency-analysis-english/5067284707016704(42 votes)
- I have most of the first part except for one word that doesn't make sense as well as ovsilpuluk. Can't figure it out.(4 votes)
- 1 : ' Black Out ' worried is referred to 'dead' worried . It is used like a proverb.
2 : ' Vigenere ' cipher is a name of a cipher ( check on google )
3 : ' holcein ' end - holcein is a name of an ambassador. ( Go to Clue 2 and check for the hints beneath the pictures ) It will give you a link to a video which you are supposed to watch to find out the key word
4. zename ..................... don't know myself! Maybe it is some kind of code name
of his helper! Ex: Agent P , Eagle X and all those other codenames!
Hope this helps!(22 votes)
- I think I found the key, but it doesn't work. I watched the video and googled the word, but the cipher tool I used can't decrypt it. Any help?(6 votes)
- try going to the ancient cryptography tutorial and go to caesar cipher exploration and enter the code into the thing and just try different combinations. Be warned. this does it for you & removes the fun.(6 votes)
- i figured out the first half of the cipher, but the same shift didn't work for second half. any hints?(4 votes)
Julius Caesar always started his cipher with the letter D replacing the letter A. Also I think the first word is START. I haven't completely done the whole of the second half but I think these tips will work. Good Luck!(6 votes)
if you know the shift, how to decode the message?(4 votes)
For the first note, I did letter frequency, where you tally up how many times each letter is used. E is the most commonly used letter in English, so the letter that occurs most in the code is usually E. You can find more information about which letters are used the most if you google letter frequency chart and click images. Hope this helps!(3 votes)
any hints on the shift? im confused(2 votes)
I wrote my own Ceaser-cipher decryption program and it's working fine on Java, with the assumption of correct inputs. It took me 2-3 hours to write it, plus a tool to count the frequency of each letter of the given text.
I have to admit it was fun writing it after being away from Java and programming :) I urge everyone to do the same if you are bored and willing to take the extra step or two.(6 votes)
- do we have to decrypt both of them ? and the whole page?(3 votes)
Is the mark above the y in the second line an asterisk?(2 votes)- Yes, although I have been working on it for a couple of weeks, and see no significance.(3 votes)
