A Fingerprint Image Encryption Scheme Based on Hyperchaotic Rössler Map

Algorithm 1

Generation of pseudorandom sequences of positions.

Require: Order variables , , and for generating pseudorandom

sequence from the rows positions or , and for generating pseudorandom

sequence the columns positions.

Ensure: Vector pseudorandom sequence of positions.

() ; ; ;

() while do

() if is equal to then

()  

()  ;

() end if

() 

() if sum of all elements of is equal to then

()  

() end if

() if is equal to then

()  

()  

() end if

() end while

() return