10B
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Is anyone having trouble submitting it? I cant find the typo
Until you submit it you might not know there is a mistake. Once you have submitted something you will get a score in your submissions tab, but no feedback, because we are cruel and heartless. But at least you will know if there is a typo in your solution! Harry
Am I on the right tracks?
Edited by Harry – Only time will tell.
Hi. I am just wondering if there is a photo of the six needle telegraph for some reference. I am not entirely sure but I assume the case files show the five needle version and I can’t find a six needle version anywhere. Sorry if this isn’t allowed but if it is it would be good to know. Thanks.
Actually, it is not too hard to figure out how it must have looked given the way the needles are used. See if you can work it out. Harry
has anyone got 10b yet?
Is there a reason why the deadline straight after this one is only 2 hours long?Because we have a policy of not setting deadlines during the night and leaving the next one to run to the morning would leave too big a gap. Arguably we should shorten the first deadline a bit to even those up, but that brings other problems, so the deadlines have ended up there by a process of elimination. Harry
What is the advantage to not giving feedback on the last challenges? Surely if brute-forcing the submissions box isn’t allowed anyway, how would people benefit from it other than finding typos? Also, dang 10b is hard… no idea what has been changed from 9b, but whatever it is, its annoying 😛
If we give feedback then that gives an advantage to anyone who relies on it, which in turn encourages everyone to rely on it. The only feedback the cryptographers at GCHQ get is when they crack a cipher and get recognizable plaintext from it, and this is the closest you are going to get to that without signing up. We think it adds something, and we think you will agree if you manage without it. Harry
apologies for being pedantic, but has anyone got this one so far?
feels much harder this year than in previous years!We do not comment on submissions until the end of the competition I am afraid. Harry
Hey Harry,
Have you reread the deadlines page for 10B?#99201
Sorry, I’ve realized my mistake:
12pm isn’t midnight, it’s noon.Is there any chance that people who get it by the second deadline (11 pm), rather than the first (9 pm), might still get invited to Bletchley?
I don’t think it gives anything much away to say that there is a strong chance of that. I would be very disappointed if not! Harry
If it is a […], then how do we reduce the complexity of the solution space from[…]?
I have found the[…], but even then one cannot […].
How do you proceed from this position?I am hardly going to start answering this sort of question! But I do feel your pain. Harry
When will feedback come on?
We will wait and see! Harry
Am I sort of on the right tracks? I haven’t slept in a long time and don’t want to spend time doing the wrong thing!
As in “Dear terrorist cell, we have had a rough night and we are having real trouble breaking into your secure message. We think we might have the right idea, but it would be really helpful if you could tell us if we are doing the right thing. Yours, GCHQ”? Doesn’t seem to be in the spirit of things really! Keep thinking, Harry
Hi, I like what you did for the hint in the case files!
Thank you! Harry
has the number of needles changed from last week to this week?
I would say so. There were just under 13000 last week, and over 20000 this week! Harry
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