Expand the idea of a bit-based stream cipher as discussed in Definition 2.1.1. in the text book to an alphabet of 29 letters as in the German language. Here, the additional letters are ä, ö and ü. Now, develop a stream cipher that uses those 29 letters, instead of bits. What does the key stream look like? Remember that in bit-based stream ciphers, the elements in the stream are members of Ring Z2What do the encryption and decryption functions look like?Encrypt the message: "an alphabet with twenty nine letters is weird". Use the very same text as the key for encryption.