Answer #39 : Libin's Feedback.

Q: Today I asked my friend Libin to review my puzzle games blog.

He replied this:

i  e  z  a  l  p  l  m  o  u  e  e  v  z  g  s

Can you help me to understand his feedback?

A: This is a well known encryption mechanism known as "Caesar's Block Cipher".

The method of decryption is given below:

1. Count the number of letters in the cipher. In our case it's 16.


2. Find the lowest N X N square, which can accommodate all the letters. In our case, 4X4 = 16, a 4X4 square can accommodate all letters.



1	2	3	4
5	6	7	8
9	10	11	12
13	14	15	16



3. Form 4 groups of letters with 4 letters in each group in the same order as in the cipher.
   
    [i e z a] [l p l m] [o u e e] [v z g s]


4. Fill the encrypted letters in each cells as per the order given in the above square.



i	e	z	a
l	p	l	m
o	u	e	e
v	z	g	s



5. Great! Now re-group the letters in the following order as shown in the table.



1	5	9	13
2	6	10	14
3	7	11	15
4	8	12	16



[i   l  o  v]  [e  p  u  z]  [z  l  e  g]  [a  m  e  s]


6. Now you can easily understand the sentence. 




i   l  o  v  e  p  u  z  z  l  e  g  a  m  e  s


Libin's feedback is " I Love Puzzle Games". 

Thanks Libin :)