Information Security Fundamentals

Hash Function Hash function is almost used in the information security phase, and also it is a transformation of a string  of characters into a shorten fixed value or for a key. In hashing or in the hash function what we do is generate a hash value or a digest using the Message authentication code (MAC), and send that hash value with the message. Let's see how the hash function is working.  As this picture describes Alice want to send a message to Bob. Alice make the message and using hash function she gets the message hash value and we call it as the message digest. Then that calculated message digest combines with the message and send it to Bob and send the hashing method too to the Bob. When Bob received the message recalculate the hash value (message digest) using the hash method sent by Alice. Now Bob also get a hash value and Bob can compare those two hash values (H1 and H2). If those hash values similar or almost similar Bob can recognize the message ...

As we all know there are some familiar names when we considering the information security. Bob, Alice, Rudy and some others like that, and that’s why I also use that name as Pizza Prank on Bob. Pizza prank, Digital certificate where we meet these kinds of words and as I mentioned above these are related to the information security phase.  So let’s look what’s going on with this prank and how will the Digital certificate related to the prank. Let’s see about this. Now this is a kind of a cheat done by an outside party and as a result of it bob has to face a difficult situation with a pizza shop. This is the Scenario Alice is a worker in a pizza shop and she is responsible person for getting orders from the customers. One day Alice got a message like this, “I want two large pizza from deviled chicken and another one with only cheese” with the name of Bob. Now I will tell the original situation of this scenario. Rudy is the man who really places the order....