A combined cryptosystem with symmetric keys for encrypting messages is proposed. Its unique feature is the use of functions of a real variable as keys instead of natural numbers. Eight key functions ...

Image steganography intends to hide an important message within an image for the purpose of secret communication or storage. Maintaining imperceptibility of the message is a major characteristic of a ...

The purpose of the sum function is to add up several rows of data quickly using the Oracle database engine. The sum function is quick, so you do not manually add up values in a loop structure ...