• With the escalating use of internet technology, the exigency for security of valuable

information becomes of utmost importance.

• Our aim is to provide an efficient way of encrypting images where the speed, time or

information are never compromised. Therefore in our paper we present a permutation

based algorithm where each pixel of the image is swapped with the corresponding

generated random value using pseudo random number generators.

Step 1: LCG

STEP 2: LFG

ARRAY OF PSEUDO

RANDOM NUMBERS

• Iteration through all

the rows shuffling

them using random

stream from previous

step

• Iteration through all

the columns shuffling

them using random

stream from previous

step

1 2 3 4 5

6 7 8 9 10

11 12 13 14 15

16 17 18 19 20

21 22 23 24 25

966558 75961 2239 25424 42073

3 0 2 1 4

Modulus of random numbers with image size

In order to attain random numbers in a specific range

Modulus of random numbers with image size

In order to attain random numbers in a specific range

2 4 0 1 3

57643 3424 21156 69078 13167

6 9 8 10 7

1 4 3 2 5

11 14 13 12 15

21 24 23 22 25

16 19 18 17 20

Row Shuffle Column Shuffle

• The decryption process is exactly similar to the encryption process. One

has to repeat the steps backwards in order to attain the original

image(Backtracking).

• Our algorithm works in linear time. In the sense that instead of rows*columns it is

rows+columns which reduces the encryption time

• Our algorithm is adaptable and flexible. By changing some parameters like the block

size, or the PRNG parameters we get a different encrypted image. Therefore leading

to a plethora of possibilities

We make use of 3 different images and pass them through the encryption

process with each having different block size.

• An image of size 1440 × 1280 pixels is encrypted using the algorithm. The private key

parameters for both encryption and decryption are set as follows:

J=418; k=1279

: a=1664525; m=2**32; c=1013904223

• Block length value: 1

• An image of size 2560 × 1600 pixels is encrypted using the algorithm. The private key

parameters for both encryption and decryption are set as follows:

: J=418; k=1279

a=1664525; m=2**32; c=1013904223

• Block length value: 8

• An image of size 1440 × 1280 pixels is encrypted using the algorithm. The private key

parameters for both encryption and decryption are set as follows:

J=418; k=1279

a=1664525; m=2**32; c=1013904223

• Block length value: 4