PICKING A SAFE PASSWORD

The PIN for your ATM card, your phone, your high-end bike is mostly four-digit code. It is not so safe. There are 10 choices for first digit (0....9), ten for second digit and so on. Hence, there are totally 10*10*10*10 =10^4 = 10000 possible 4-digit codes. The computer can check all the choices in a blink of an eye. That is why your online bank account, phones, ATM get locked if you try wrong PINs a few times in a row.

    You can use words as passwords. If you choose six-letter word, there will be 26^6 or 300 million words are possible in the English language. Even 300 million is not a big number for the computer. It will check them out in a few seconds. The scrabble dictionary lists about 20000 meaningful 6-letter words.  So, the cracking problem is further become easy. If you choose predictable words, a human will very easily crack the passwords.  Datagenetics .com says one out of every six PIN is either 1234 or 1111.
    How to pick a unpickable password? Longer password from larger alphabet is the best choice. The normal keyboard has 90 characters. Choose a twenty-character password from it. The fraudster has to try 90^20 possible passwords. Even a high-end computer will take 10000000000000000 times the age of the universe to crack the password.
    If you choose a password like "HsgP58#AB4dfe%", how will you remember? The verdict is, choose a longer password from 90 characters, but you should be able to remember it.

One method to create a strong password
1. Take a simple sentence
SHE LOOKS LIKE ANGEL
2. Remove n number of characters from each word from the end.
let n = 2
SLOOLIANG
3. Now, replace some alphabet with special characters.
o =%
L=@
G=9

We get,
SL%%@1an9
     Remember the method. Write down the process. Keep it safe.
    You can use such a complicated method for online money transactions. Remember, even banks cannot find out your passwords and PINs.

In digital age, we must live with passwords. So, put some extra efforts for secure life.

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THE EARTH, A SUPER ORGANISM

JOIN MY COURSE: "Become a programmer in a day with python" A man called 'love lock' (what a name) proposed a theory called Gaia theory, named after Greek Goddess. It says, "Earth is a self-regulating organism like a human being. The organic life in it interacts with in-organic matter and maintains atmosphere, temperature and environment". Hence the earth is still suitable for the life to thrive. Imagine, in a particular place, there are lot of flowers. Some flowers are white and some are darkly coloured. We know, white reflects light and heat while dark absorbs the same. White flowers can thrive in hot climate. But dark flowers requires cold climate. The absorption and reflection balances and the environment reaches average, warm temperature at which both the flowers can co-exist. This is the essence of "Gaia" theory. On our earth, the oxygen constitute 20% of the atmosphere. The oxygen level is always mai

THE PARABOLA

A jet of water shooting from a hose pipe will follow a parabolic path. What is the so special about parabola. Y= x^2 Draw a graph for the above equation. It will result in a parabola. This parabola is also called unit parabola. Any equation involving square will yield a parabola. Example: Y = 2x^2 +3x+3 (also called quadratic equation) X= 2 and -2, both satisfies the equation 4 = X^2. Parabolic equations always have two solutions. Any motion taking place freely under gravity follows parabolic path. Examples: An object dropped from a moving train, A bomb dropped from flying plane, A ball kicked upwards. If a beam of light rays fall on the parabolic shaped mirror, they will be reflected and brought to focus on a point. This fact is made use of in Dish Antenna, Telescope mirrors, etc. Inverted parabola shape is used in the construction of buildings and bridges. Because the shape is able to bear more weight. A plane

DISORDER IS THE "ORDER OF THE DAY"

Imagine a balloon full of air. The air molecules are moving randomly inside the balloon. Let us pierce the balloon with a pin. The air rushes out. Why should not the air molecules stay inside the balloon safely and ignore the little hole? That is not the way the world works. The molecules always "want to occupy as many states as possible". Hence the air goes out in the open to occupy more volume. The things always goes into disorder (entropy) and the disorder increases with time. The above statement is what we call "second law of thermodynamics". Consider a cup of coffee on the table. Suppose the heat from entire room flows to your cup of coffee, the coffee will boil and the rest of the room will freeze. Freezing means bringing things to order and arrangement. It violates the second law. Hence it will never happen. Hence heat must flow from high temperature to low temperature and not the other way. The air molecules in y

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