Creating a Substitution Cipher with C#

Nice explanation

What if I want to give my plaintext in upper case ? Will this work for such conditions ? Because I am getting error while making in upper case in here (char[i] = key[j])

Hello Vulpes, display incorrect characters when debugging.I think should be do this: Console.WriteLine("Decrypted : {0}", plainText); // error. Console.WriteLine("Decrypted : {0}", decryptedText); // right.int j = key.IndexOf(cipherText[i]) +97;int j = key.IndexOf(cipherText[i]) +97; // This Right.

good one...

It might be a 'display' problem i.e. you've encrypted non-ASCII characters which can't be displayed in the encoding or font you're currently using and so a '?' is displayed instead. Failing that, can you post a plain code string which after encryption and decryption produces a '?' character and I'll look into it.

Hi sirEncryption worked well for but decrypting i am getting text like this ??????? i have used the 1st program i.e so what is substitution cipher ? code mentioned there

Very Impressive