4 Block Crypt

what the hell IS that!!?? it looks like the Matrix or something

This is a typical Value-Index cryptography protocol used for transmission of data

Basically numeric values are indexed and sent within the series of indices as the values themselves...

i.e The first 2 numbers in each row of the block explains the index of a number in that column.

So in

3492
1332
9233
8283

If the index is more than N (4) then it is rounded as a modulo N (4) value

So 3492 indicates first index 3 as 3rd number from the column of 3 (3,1,9,8) i.e. 9
So 3492 indicates second index 4 as 4th number from the column of 4 (4,3,2,2) i.e. 2
So 34 is actually representing 92

Similalrly 9233 indicates first index 9 (9 mod 4 = 1st) from the column of 9 (3,1,9,8) i.e. 3
So second index 2 from the column of 2 (4,3,2,2) i.e. 3
So 92 is actually representing 33

And so on


Now when such data is typical in a communication channel they use only first 2 digits from each block as the series of indices and use them to represent the actual number also called as index-value self referrence protocol.

i.e. 34139282 actually represents 92323383

Disadvantage = This protocol is reversible. i.e. received data can be used to get the original sequence back

Thats why the next 4 block sequence

15*5
*866
627*
5*18

can be easily completed as

1515
7866
6278
5618

has *s in the first 2 digits of each row (which are actually the indices) being an input can be tracked from the output (last 2 digits in the same row from the block)

Can we make this irreversible.... Any ideas?