Abstract
Secured Communication involves Encryption process at the sending end and Decryption process at the
receiving end of the communication system. Many Ciphers have been developed to provide data security .
The efficiency of the Ciphers that are being used depends mainly on their throughput and memory
requirement. Using of large key spaces with huge number of rounds with multiple complex operations may
provide security but at the same time affects speed of operation. Hence in this paper we have proposed a
method to improve Caesar cipher with random number generation technique for key generation operations.
The Caesar cipher has been expanded so as to include alphabets, numbers and symbols. The original
Caesar cipher was restricted only for alphabets. The key used for Caesar Substitution has been derived
using a key Matrix Trace value restricted to Modulo 94. The Matrix elements are generated using recursive
random number generation equation, the output of which solely depends on the value of seed selected . In
this paper, we made an effort to incorporate modern cipher properties to classical cipher. The second stage
of encryption has been performed using columnar transposition with arbitrary random order column
selection. Thus the proposed Scheme is a hybrid version of classical and modern cipher properties. The
proposed method provides appreciable Security with high throughput and occupies minimum memory
space. The Method is resistant against brute-force attack with 93! Combinations of keys, for Caesar
encryption.
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