New Algorithm with Bandwidth Reduction for Smaller Size Digital Signature

摘要

Two drawbacks when using digital signature schemes are extra bandwidth and large file size during transmission. The size of encrypted data is much larger than the size of the original data, thus to produce a cipher text size closer to an original file, digital signature can be embedded into the image as stegano-image, Hence this method can avoid extra file, decrease the size of transmitted file and reduce the bandwidth required for the transmission of the file. LSB algorithm is not highly secure against different attacks. Implementing an encryption algorithm in the LSB steganographic method can be contributed to increasing the degree of security. Hence this method can avoid extra file, decrease the size of transmitted file and reduce the bandwidth required for the transmission of the file. Testing new algorithms showed that its hashed file size is 8.51% reduction of the original file in messages with size lower than 1600 bytes.