Description
EasyCTF is one of the largest student-run high school cybersecurity events.
It took place on Fri. 10/02/2018 until Sun. 20/02/2018. 1790 teams competed in the event. Continue reading
EasyCTF IV – Special Endings
EasyCTF IV – Not OTP
Description
It seems we’ve intercepted 2 strings that were both encrypted with what looks like OTP! Is it possible to decrypt them?
c1 = 38445d4e5311544249005351535f005d5d0c575b5e4f481155504e495740145f4c505c5c0e196044454817564d4e12515a5f4f12465c4a45431245430050154b4d4d415c560c4f54144440415f595845494c125953575513454e11525e484550424941595b5a4b c2 = 3343464b415550424b415551454b00405b4553135e5f00455f540c535750464954154a5852505a4b00455f5458004b5f430c575b58550c4e5444545e0056405d5f53101055404155145d5f0053565f59524c54574f46416c5854416e525e11506f485206554e51
EasyCTF IV – Soupstitution
Description
We had a flag, but lost it in a mess of alphabet soup! Can you help us find it?
Connect to the server via nc c1.easyctf.com 12484. Continue reading
EasyCTF IV – RSA V
Description
Bob is extremely paranoid, so he decided that just one RSA encryption is not enough. Before sending his message to Alice, he forced her to create 5 public keys so he could encrypt his message 5 times! Show him that he still is not secure…
Here are the 5 public keys that Bob used, each in the format of (N, e): (9247606623523847772698953161616455664821867183571218056970099751301682205123115716089486799837447397925308887976775994817175994945760278197527909621793469, 11) (9247606623523847772698953161616455664821867183571218056970099751301682205123115716089486799837447397925308887976775994817175994945760278197527909621793469, 41) (9247606623523847772698953161616455664821867183571218056970099751301682205123115716089486799837447397925308887976775994817175994945760278197527909621793469, 67623079903) (9247606623523847772698953161616455664821867183571218056970099751301682205123115716089486799837447397925308887976775994817175994945760278197527909621793469, 5161910578063) (9247606623523847772698953161616455664821867183571218056970099751301682205123115716089486799837447397925308887976775994817175994945760278197527909621793469, 175238643578591220695210061216092361657427152135258210375005373467710731238260448371371798471959129039441888531548193154205671) Here is his encrypted message: 7117565509436551004326380884878672285722722211683863300406979545670706419248965442464045826652880670654603049188012705474321735863639519103720255725251120
Nullcom Hackim 2018 – Recap
Description
The Hackim 2018 CTF took place on Fri. 09/02/2018, 23:00 until Sun. 11/02/2018, 11:00. Over 1800 people took part in the event but only the top 40 were eligible to win a free conference pass for the Nullcom Goa 2018. Continue reading
Hackim18-What did he said ?
Description
By his grace, we have been successfully organizing nullcon, year on year and this is the Nullcon9. At this juncture we cannot forget what did he had said, the one panacea given by him…
In 2010 when we were all worried, how can we be successful with this first ever event… Continue reading
Hackim18 – Web2
Description
This is the second challenge in the web category of the hackim 2018 CTF. There is no description for this challenge besides what may be the challenge’s title: Hidden in Plain Sight Continue reading
Hackim18 – Web1
Description
The objective of this challenge is to find a way to get logged in as the user “administrator”..
This is the demo application for our new session management system based on military cryptography (namely CBC-MAC). You can log in as any user (except ‘administrator’) with the password ‘Password1’. We blocked access to ‘administrator’ account for security reasons. Continue reading
The beginning
Welcome to my blog !
As a first post I think I should explain the reasons why I decided to make a blog, what I will be posting about and how frequently, so let’s do that quickly !
Continue reading