Information Security: Principles and Practices 2nd Edition by Jim Breithaupt, Mark S. Merkow

Exercise 10

More Practice of Decryption Using Transposition

1. Decrypt the following message using the keyword CAUTION and the transposition method:

OYES NTRE ECMG UNMS BAYE NUDA OOAS

2. What result did you get?

Step 1 of 3

Decrypting cipher text using Transposition method

1. Transposition is a method of encryption and decryption wherein a plaintext is converted into a cipher text and vice-versa. This makes the data to be sent more secure as data in encrypted form is difficult to read and understand. Also it is hard to decode.

In transposition method, the basic idea is to rearrange the letters of the word (data) in some different order such that it becomes unreadable.

Given the keyword CAUTION, the message "OYES NTRE ECMG UNMS BAYE NUDA OOAS", needs to be decrypted using Transposition method. The steps to create the encrypted text from the given plaintext are shown below: