Abstract:
Encryption is used to securely transmit data in
open networks. It can also be defined as the process of
obscuring information to make it unreasonable without special
knowledge. Encryption is the process of transformation the
images to ensure its security. Most of the available encryption
algorithms are mainly used for textual data and may not be
suitable for multimedia data such as images. This system
presents a block-based transformation algorithm based on the
combination of image transformation and a well known
encryption and decryption algorithm called Blowfish. The
original image is divided into a random number of blocks and
then shuffle within the image. The generated image is encrypted
using the blowfish encryption algorithm. From the results, the
correlation between image elements was significantly decreased
by using the proposed technique. It takes a variable-length key,
from 32 bits to 448 bits. Blowfish is a fast cryptographic
software algorithm and symmetric and symmetric block cipher.
