ABSTRACT

As the internet grows in popularity and therefore also in size more and more transmission takes place mainly because the technology is more readily available and applications have become more user friendly allowing entry to less sophisticated user over a broad spectrum.most data transfer are mainly text based not secure and vulnerable to various forms of security risks. So the model that uses SSH for securing channel like intranet/internet which provides client authentication encryption and decryption with high degree of security by transferring the data in an encrypted format, up on this model enhances the efficiency of data transmission by encrypting or decrypting the data with irrational DES. DES is a cryptographic standard however,the applications of it limited because of small key space based on irrational number.Moreover the permutation controlled by data can be performed at high speed in generic cpu.this scheme also expands the key space without costing more to run.and also finally through the combination of secure shell(ssh) and irrational DES not only enhances the security of communication channel.it also provides varius applications like remote user creation,remote user deletion,remote command execution,remote system shutdown ,remote file transfer applications in an highly secure manner.