Need an Encryption/decryption method does not have a '/' in the encrypted string [duplicate]

Answer 1

Convert.ToBase64String uses letters, numbers, + and / so you can simply switch the / out for something else that's not a letter, number or +:

Encoding:

// ...
string cipherText = Convert.ToBase64String(cipherTextBytes);
string ctWithoutSlashes = cipherText.Replace("/", "-");

Decoding

string cipherText = ctWithoutSlashes.Replace("-", "/");
// ...