Halloween Contest - Caeser Cipher

[Stapled]

My entry? Done in C#.

        private string strEnc(string text)
        {
            string encrypt = "";
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(text);

            for (int c = 0; c <= bytes.Length-1; c++)
            {
                encrypt += Convert.ToChar(bytes[c] - 5);
            }

            return encrypt;
        }
        private string strDec(string text)
        {
            string decrypt = "";
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(text);

            for (int c = 0; c <= bytes.Length - 1; c++)
            {
                decrypt += Convert.ToChar(bytes[c] + 5);
            }

            return decrypt;
        }