The study of the feistel cipher laid the foundation for the development of cryptography in the seventies of the last century. In the classical feistel cipher the block size is 64 bits, and it is divided into two halves wherein each half is containing 32 bits. In this paper, the authors have developed a novel block cipher by modifying classical feistel cipher. In this, they have used a key bunched wherein each key has a multiplicative inverse. The cryptanalysis carried out in this investigation clearly shows that this cipher cannot be broken by any attack.