Transposition cipher example: In this video we will learn about columnar transposition cipher in Hindi.
In a columnar transposition, the message is written out in rows of a fixed length, and then read out again column by column, and the columns are chosen in some scrambled order.
Columnar transposition cipher ENGLISH: http://www.youtube.com/watch?v=p9jz-Dg_aQQ
Both the width of the rows and the permutation of the columns are usually defined by a keyword.
For example, the keyword ZEBRAS is of length 6 (so the rows are of length 6), and the permutation is defined by the alphabetical order of the letters in the keyword. In this case, the order would be "6 3 2 4 1 5".
REGULAR COLUMNAR TRANSPOSITION
In a regular columnar transposition cipher, any spare spaces are filled with nulls; in an irregular columnar transposition cipher, the spaces are left blank.
Finally, the message is read off in columns, in the order specified by the keyword. For example, suppose we use the keyword ZEBRAS and the message WE ARE DISCOVERED. FLEE AT ONCE. In a regular columnar transposition, we write this into the grid as follows:
IRREGULAR COLUMNAR TRANSPOSITION
To decipher it, the recipient has to work out the column lengths by dividing the message length by the key length. Then he can write the message out in columns again, then re-order the columns by reforming the key word.
SO in our case the length of our message is 25, which when divided by key length which is 6 we get length of column as 4 and one column with length 5 as its 24 + 1 and 24 is divisible by 6.
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Chapters:
0:00-0:37 Columnar transposition Decryption Preview
0:38-1:05 Introduction
1:05-2:45 What is columnar transposition?
2:45-3:13 what is regular columnar transposition?
3:13-4:22 Example of columnar transposition Encryption
4:22-6:34 Example of columnar transposition Decryption
6:34-7:55 Example of Irregular columnar transposition
7:55-8:13 Exit animation