Skip to main content

Multi Factor Authentication


How to make sure User A is User A as he claims, not User a.

Our old movies smugglers can teach us a few tricks here. There are multiple levels or factor of authentication.

1. First Factor - Something you only know. It's like a secret pin, key, pattern or password.
    In the old movie, there used to be a secret code between smugglers.  Parties involved in the transaction only knows this secret code.

2. Second Factor - Something you only own. It's like the ATM card, phone, device or OTP. 
    In the old movies, smugglers used torn currency note. Both parties will have one part.  One party need to show ownership of half of the torn currency note to receive goods from another party.

3.  Third Factor - Something you are. It's related to your physical appearance. Like your face, your thumb impression or voice. Your personal physical traits will be used to identify you.
     Remember hero duplicates being used to catch smugglers. These were negative applications of third factor tough. 

Above three or widely used in IT for now. There is 2 more factor of authentication mostly related to human behaviour. I am yet to find their real-life applications before I write them here.




Comments

Post a Comment

Popular posts from this blog

Car Parking Problem

There is n parking slots and n-1 car already parked. Lets say car parked with initial arrangement and we want to make the car to be parked to some other arrangement. Lets say n = 5, inital = free, 3, 4, 1, 2 desired = 1, free, 2, 4 ,3 Give an algorithm with minimum steps needed to get desired arrangement. Told by one of my friend and after a lot of search i really got a nice solution. I will post solution in comment part
3 comments
Read more

DEShaw Interview Questions

ther are N numbers frm 1 to N and starting from index 1 we will keep deleting every alternate going in cyclic order with array. Only one element will be left at the end. Tell us the index of element in array we started. e.g. there are 5 nums 1 2 3 4 5 then after 1st iteration 1 3 5 will be remained. .. then 1 will be next to be elliminated and then 5 3 will remain alone... give sum efficient algorithm to calculate which numer will remain at the end Answer: 2*(n-2^p)+1 where p=floor(log2 n)
Post a Comment
Read more

One way : Heap or Stack allocation

Took my time to find solution for this and it actually made me realize how much i have to learn. Now question is how can we enforce the creation of objects whether on heap or stack. Creating object on Heap only. Make your destructor private and create a destroy function. Class A {  ~A(){} public:  A(){} void destroy() { delete this; } } Now if you can not create your object: A a; // error: 'A::~A()' is private A  a = new A(); Great. Now all the objects will be allocated to heap only. Making destructor private a better choice than constructor as we don't know number of constructor so early in programming. Creating object on stack While i knew that it has to do something with operator new, but could not figure out how can i create object on stack and return the memory back to class initialization. Though answer was simple, i had to google for that: Overload operator new, new[], operator delete and delete[] and make them private ;) class A { pr...
Post a Comment
Read more