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October 20, 2005
Timing for Challenge 4
The points for Challenge 4B go as follows:
Any correct solution by midnight today (Thursday 20th October) 25 points
After that the points decrease by one every six hours, so 24 points for a correct solution before 6am on Friday 21st October, 23 for a solution between 6am and midday and so on. Hope that is clear. We also hope that Challenge B slows you right down this week! Good luck,
Posted by Harry at October 20, 2005 03:43 PM
Comments
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'congratulations' Kirsti, the phone does work!
Posted by: at October 21, 2005 01:04 PM
Sean, have you got a mobile phone?
[Smart idea. Does it work? Harry]
Posted by: Kirsti at October 21, 2005 12:33 PM
I recently received an invitation to a friends wedding on December 28th. My friends name is Ieuan and he is getting married to Paula.
He sent out a piece of paper enclosed in the wedding invitation with the following number sequences on it:
222666 66477728 8855528444666 66777709996668804428883302227772 2225533 308443302226663 330944280933096668855530777332555 5559990555444553304447777083367887777089666
He obviously thinks that his wedding guests enjoy decrypting as much as he does.
I have tried all I the ways I know of breaking the code and was wondering if anyone could give me some clues on what to do next. I've broken it down into patterns, then noted frequency of individual sets of numbers i.e. 222, then noted down frequency of bigraphs i.e. 222666, but I cant seem to make any sense of it.
Any help from anyone would be appreciated.
many thanks
Sean
Posted by: Sean at October 21, 2005 10:44 AM
hello. Completed the part b of message 4 but unfortunatly its wasn't correct so i submitted it today and hopefull i got it correct. I'm really liking the challenges this time as there is so much tension about.
Thanks
Laura @ fairham community college nottingham
Posted by: lauraloo at October 21, 2005 08:23 AM
We will use the timing on the final challenge to decide any draw. Harry.
Posted by: Harry at October 20, 2005 09:13 PM
When it actually comes down to the end and you have people still in joint positions, does submission time matter to the second? Or will it still only matter within the specified intervals?
Posted by: Jonathan at October 20, 2005 08:34 PM
Dan,
part A tells you what cipher is used for part B! But of course you have to find the cipher text first...
Posted by: at October 20, 2005 06:24 PM
There is no mistakes. Done it.
Posted by: Smug Person at October 20, 2005 06:05 PM
is part b a vigenere?
i've tried all the obvious keywords but nothing happens - i get a load of rubbish!
Posted by: dan at October 20, 2005 05:32 PM
We're supposed to leave mistakes in, but what do we do if the mistake occurs such that it is impossible to occur under the system used (e.g. getting an "E" in ADFGVX)? Do we simply bypass the clearly wrong section, or correct it?
Posted by: OcelotIIX at October 20, 2005 05:13 PM
Harry - please delete this if it is too revealing
There seems to be a problem with the Morse Code transcriber there exist in the ciphertext both "1111" and "0000" - but in Morse Code there is no character "----". Therefore, there must be an error in the ciphertext? This means that the rest of the cipher will not decode, so what should I do?
Thanks, Kati
Posted by: Katriel Cohn-Gordon at October 20, 2005 05:13 PM