Soon, On the night after the Halloween, there will be a Codeforces gym contest, named Crypto cup 1.0.
Like its name, it's a cryptography contest and for all problems, you are given some sample encryptions encrypted using a certain algorithm and you have to write a program to decrypt the given messages.
There will be 18 problems and you have 6:30 hours to solve them. I hope it will be interesting.
For practicing cryptography, we recommend SecutiryOverRide's cryptography challenges.
Also, this round needs a little Algorithm and CS knowledge.Don't forget to pay attention to problem's titles, they might be helpful ;)
Currently, problems are being prepared, so you're unable to see the contest in gym contest list yet.
Problems are in decreasing order of difficulty.
UPD: Duration has been increased by half an hour, now it's 6:30 .
UPD2: Please note that contest will be held on November 1st, because it had overlap with Shahid Beheshti University ACM.
UPD3: Now it's in the Gym contests list.
UPD4: Registration is open.
UPD5: Contest is over.
I hope you enjoyed the problems.
Congratulation to the winners who solved all the problems :
Be aware, our standard rounds are coming... ;)