If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

### Course: Computer science theory>Unit 2

Lesson 3: Cryptography challenge 101

# Clue #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
• Thank you very much!
You have my upvote and ethernal greetings.
• Does anyone have the text for clue 1?
• 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.
• 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.
• 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!
• 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?
• 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.
• i figured out the first half of the cipher, but the same shift didn't work for second half. any hints?
• 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!
• if you know the shift, how to decode the message?