I could not participate in GiS CTF which was conducted around 10 days back. But, the one good thing about these people is that they always have an archive of all their past events. This is a 150 point Crypto challenge named as Knockers. Here is the question. Dude, here’s a knocker token that will let you access my service on port 80. One day I will let you see my cool stuff on port 7175.

I had been so busy with my GATE preparations that I had to write some code to clear my head. Also my GitHub contributions graph has started looking so bleak lately. So, I started working on one of my old steganography project. It is hardly ground-breaking. It is the implementation of the age old LSB Steganography in images with Python and Pillow. For people who do not have a clue of what I am talking about, LSB Steganography is the method of encoding data in the least significant bits of the images so that, there is minimal or no significant change in the image when looked at with the naked eye.

AKLS As I mentioned earlier, I am learning about stream ciphers in the first week of my Cryptography course in Coursera. It is really good and I encourage anyone who is interested in mathematics to take it up. Trust me, you are going to fall in love with it. Although I have had quite a few encounters with breaking stream ciphers in CTF events, the academic (especially, the mathematics) side of it, is quite amazing.