A NEW ROBUST BLOWFISH BLOCK CIPHER (RBBC) FOR SECURE COMMUNICATION SYSTEMS

The higher demand and greater awareness on security problems lead to study of more

secure, high performance, reliable and flexible systems. To meet these demands a proposed

Robust Blowfish Block Cipher (RBBC) algorithm is introduced. The same algorithm is used

for decryption as well as encryption. The only difference is that the input to encryption is

plaintext, where as for decryption is ciphertext, and the key in the reverse order. Because

blowfish algorithm is only suitable for applications where the key does not often change, the

RBBC algorithm was introduced to overcome the higher defect appearing in the blowfish

algorithm .In the RBBC algorithm the user can change the key without any problem.