Description : No Error message for letters entered.
To replicate : Experiments -> Vernam Cipher and Perfect secrecy -> Experiment -> Simulation -> Enter letters in the CipherText box and click Decipher.
Expected result : Alert asking user to enter valid input or only binary digits.
Actual result :
Description : No Error message for letters entered. To replicate : Experiments -> Vernam Cipher and Perfect secrecy -> Experiment -> Simulation -> Enter letters in the CipherText box and click Decipher. Expected result : Alert asking user to enter valid input or only binary digits. Actual result :![Screenshot from 2019-03-17 15-45-01](https://user-images.githubusercontent.com/43525542/54488759-a4aef080-48cb-11e9-95ff-7405944a3d0f.png)