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 If you are super in maths calculation , it is very simple to hack bank account . If you are buying a laptop in amazon , for that you have to send your bank details to bank but hackers easily hack your bank account . so to safe your details bank uses encryption . what is encryption ? For example take your account number as 2020 to safe your bank details bank change your account number into unknown language . The unknown language is only opened by the key  . But in this case there is one big problem that is the bank want to send you the key known as OTP . If the bank sends you the otp the hackers will easily hack the otp and your detail . if the bank want to send the otp safely there are 2 method . 1 - calling you and saying your otp 2 - come to your house and say the otp but both are impossible . because a bank has more number of customers . so bank use an another method that is to split the keys to public keys and private keys . you can ask that the hackers can easily hack the details via public keys . There is a trick in that if the hacker want to hack your details via public key it takes 3 years . The bank will generate the key by this method that   is   
N = P x Q  ( N = public key , p and q is a large prime number ) .  P and Q are only know by bank from that any one is a secret key . if you find this factor you can easily hack bank account but there is a problem  you can easily multiply two big prime factors but you cannot find prime factors from one big number it takes 100 years to find . popular brands like Facebook , twitter , youtube , amazon , flipkart , use this encryption method . The name of this encryption method is ASR .   

                                   Hacking is injurious to life 

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