Internet entities are regularly affected by Distributed Denial of Service (DDoS) of various scales. This is basically a way to hack into an entity and stop it from working. Hackers use it all the time to bring down famous sites. They tend to attack the domain name system (DNS), since it allows to infiltrate heavily. … Continue reading DNS Cache Poisoning
Category: Security
How To Reset The Admin Password In Mac OS X
So you have finally gotten yourself in this situation! You have a Mac in front of you and you have forgotten the admin password. You don't have the cd either. What we do we do now? Well, as it turns out, there is a simple procedure to reset the admin password: Restart the macbook. … Continue reading How To Reset The Admin Password In Mac OS X
The Intuition Behind Image Watermarking
This is a continuation of my blog post on intro to digital watermarking. In that post, we discussed what digital watermarking is and how it can be achieved. Here, we will discuss the intuition behind image watermarking and a few techniques that can be used. If you look at enough number of images, you will … Continue reading The Intuition Behind Image Watermarking
Digital Watermarking
Let's say you want to verify the authenticity of a signal. The signal can take any form like an image, audio, video, or any other kind of bit stream. By now, everybody would have heard the term "watermark" being used in the general sense. The most common example would be currency notes. Watermarks are embedded … Continue reading Digital Watermarking
Image Steganography
As discussed in my previous post, steganography is the art of hiding the fact that communication is taking place. We achieve this by hiding original information inside other information known as carrier files. Many different carrier file formats can be used, but digital images are the most popular because of their frequency of occurrence on … Continue reading Image Steganography
Steganography
Let's say that we want to communicate with someone secretly. We prefer that only the intended recipient have the ability to decode the contents of the communication. We obviously want to keep the message secret. Sounds familiar? A common solution to this problem is to use encryption. An encryption scheme takes a message and transforms … Continue reading Steganography
P vs NP: The Epic Saga
P vs NP problem is one of the great unsolved problems in theoretical computer science. This problem has become broadly recognized in the mathematical community as a mathematical question because it is fundamental, important and beautiful. It is in fact one of the seven Millennium Prize Problems. If you solve this problem, you get $1 … Continue reading P vs NP: The Epic Saga
Reimann Hypothesis And Its Connection To Cryptography
Over the centuries, mathematicians have been involved in solving some of most complex problems. But what is the motivation behind that? The pursuit of truth! But The Clay Mathematics Institute thought that there should be a little more than that. So to celebrate mathematics in the new millennium, they established seven Millennium Prize Problems. The … Continue reading Reimann Hypothesis And Its Connection To Cryptography
Onion Routing
I was recently reading some literature about data encryption and I stumbled across an interesting concept. The classic secure communication model is the one where the sender encrypts the message and sends it across the network, which is then decrypted at the receiver's end. In real life, this is done over several networks and several … Continue reading Onion Routing
Operation Aurora
On January 14, 2010 McAfee Labs identified a zero-day vulnerability in Microsoft Internet Explorer that was used as an entry point for Operation Aurora to exploit Google and at least 20 other companies. Microsoft issued a security bulletin and patch immediately. Operation Aurora was a coordinated attack which included a piece of computer code that … Continue reading Operation Aurora
Perpetual Enigma 