The Safe Way of Writing Down the Password - Caesars Cipher
when you have to write down yor secret pass you don’t need to write it exactly as it is letter by letter.
Instead, use the code. This time I want to show you the very ancient cipher used by Caesar of Rome.
The idea is very simple and easy to remember, but still takes some time to find out the woman’s name
written as ‘LZQSZ‘.
And now our secret method :
Get a string ABCDEFGHIJKLMNOPQRSTUVWXYZ of all the letters of the alphabet and give them the numbers
A=1 B=2 C=3 Z=24 etc.
Now pick the cipher code number lets say 3.
Replace the letters with the ciphered ones.
A+3=1+3=4=D,
instead of A you will get D
B+=2+3=5=E
instead of B you will get E
if it is bigger than 24 go back
Y=23+3 = 26 (-24) = 2 = B
instead of Y you will get B
Z=24+3 = 27 (-24) =3 = C
instead of Z you will get C
finally our string
ABCDEFGHIJKLMNOPQRSTUVWXYZ
is replaced by the new one
DEFGHIJKLMNOPQRSTUVWXYZABC
where all the letters are shifted by 3
Ok,now when you have to write the pass ’safsec’
replace the letters and instead write ‘vdivhf’.
Then whe you need the pass just decode V-3=S etc.
and you have it back.
The code is used in the contemprary machines as ROT, in our example ROT3.
You can use any addition or substraction, and it is easy to see, that in 24 letters alphabet shift -21 also means shift +3
and shift +25 means +1 etc.
The same method you can use for digits,you can als add some special signs, just remember the order in the string.
Of course the cipher is very simple, and easy to break, if you have a TIME.
But think about PIN.
Usually after three errors the credit card is hold in ATM machine.
Using the above method you can write your PIN as ‘7239′ and when the thief tries to input this code, he has one trial gone,
and just two times more to try any other combination.
Only you know the shift, and the real code.
P.S. I hope you now know the name of a woman, if not - shift by one.