Here’s a puzzle I have been attempting to resolve for per week, however I’ve not made any actual progress. A number of the issues I’ve tried I’ll embody as spoilers.
The puzzle is from a contest which has simply ended, however will probably be a couple of months till options are launched and I assumed possibly the group right here might assist put my thoughts at relaxation by explaining the puzzle to me!
Finest concept I’ve had
I needed to try to draw a path within the grid which spelt a phrase. I hoped to discover a path which lined the entire grid, however I could not discover something logical. The perfect I might do was to spell the phrase
FRIENDby strolling alongside the next path after which utilizing the Polybius sq. to decode the message.
The trail right here offers the numbers
21 . 42 . 24 . 15 . 33 . 14 .which decodes to
FR(I/J)END. I like this resolution as the trail appears pretty logical and begins from the purple two, however I am not satisfied that is the reply.
Context for the puzzle
Final week, there was a cryptography olympiad NSU Crypto. There are two rounds, one which is for people and lasts at some point, after which a second spherical which lasts per week and may be performed in groups.
This drawback was drawback one part A for the person spherical, after which used once more for the second spherical for the groups competitors. You’ll be able to obtain the unique PDF of the problem from the next hyperlink.
Looks as if this puzzle has appeared as soon as earlier than, however was appropriately locked, because it was posted through the competitors… Related query
~~Replace~~ (This replace was primarily based on a touch which had a typo)
I’ve been made conscious of a touch which was uploaded lately.
For instance, in one in all them it was obligatory to recollect the cipher “polybius sq.” (the letter “C” is encoded as 13, the letter “R” as 42, and so on.) and construct a series of letter code designations, transferring sequentially across the sq., beginning with the chosen cell and separating the letters with dots: 24.42. Will you proceed?
This appears to counsel the logic of the trail which spelt
FRIENDwas right, however the path itself was flawed. Perhaps via reuse of numbers you cross all 9 dots and return to the purple 2?
I used to be simply emailed that the earlier trace had a typo. It appears the answer I counsel above could the truth is be the reply
16 duties of various complexity have been supplied to the contributors. Amongst them are the issues of quantum computing in cryptography, the technology of keys for working with digital cash, the design of ciphers and new cryptographic protocols, the evaluation of recent hash capabilities and, in fact, enjoyable duties for ingenuity. For instance, in one in all them it was obligatory to recollect the cipher “Polybius’s sq.” (the letter “C” is encoded as 13, the letter “R” as 42, and so on.) and construct a series of letter codes, transferring sequentially alongside the sq., ranging from chosen cell and separating the letters with dots: 21.42. Proceed?
21 . 42 .is identical logic and path begin as I used to derive
FRIEND. Nevertheless, possibly the trail continues to say one thing longer than