4.3.3 Using Vigenere Cipher Widget
There is a widget available at the website:
[ Ссылка ]
It is called Vigenere Cipher Encryption Widget. It shows animation of the encryption and decryption of plaintext by using Vigenere Cipher method according to a given key. Screenshot of this widget is shown in Figure 4-13.You can type text on upper left corner and provide a key for encryption. Press the "Encrypt" button and then click on £ to see the animation of encryption. Both the buttons are marked with red circles. Similarly, we can decrypt a ciphertext to see the original message.
• Practical to decrypt a message
To decrypt a message, we find the letters of key in the rows of Vigenere table and then in that row we locate the letter of encrypted text. When the letter is found we take the column heading for that letter as decrypted letter. For example, to decrypt "OIXLSUAQ" with key "ZINDABAD" we find the row for the letter 'Z' and in that rows we find the letter 'O' where we can identify the column heading, i.e., 'P' in this case. Similarly, we continue with each letter of the cypher text and decrypt the cypher text.
Do you know?
Gaius Julius Caesar was born in July 13,100 BC, Rome, Italy and was assassinated on March 15, 44 BC. His famous quotes are:
1) Experience is the teacher of all things.
2) Men freely believe that which they desire
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Computer Science 9th class
Lecturer of Computer Science
By Sir Shahbaz Ali
For any query or private tutoring contact (0309-0334424)
shahbazalicp@gmail.com
