Mr.M. Venkatesan Mrs.P.MeenakshiDevi Dr.K.Duraiswamy Dr.K.Thiagarajah

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A New Data Hiding Scheme with Quality Control for Binary Images Using Block Parity Mr.M. Venkatesan Mrs.P.MeenakshiDevi Dr.K.Duraiswamy Dr.K.Thiagarajah K.S Rangasamy College of Technology,Namakkal Dt,TamiNadu,India Source:Third International Symposium on Information Assurance and Security, 2007IEEE Reporter:Liu Rui 2008.6.3

Outline Introduction Block Data Hiding Method Experimental Results Conclusion

Introduction Hiding data in a binary image For any bit that is modified in the host image,the bit must be adjacent to another bit that has the same value as the formers new value.

Block Data Hiding Method 1 1 F1 F2 Partitioned into 3*3 blocks F3 F4 Host image

Block Data Hiding Method(cont.) If Fi is completely black or blank, simply keep Fi intact (not hidden with data) and skip the following steps. F2= Computing sum of all elements in the matrix 1 1 1 F1= F3= F4= SUM=5 SUM=8 SUM=4

Block Data Hiding Method(cont.) 1 1 1 F1= F3= F4= SUM=5 SUM=8 SUM=4 SUM(F1)mod 2=1 SUM(F3)mod 2=0 SUM(F4)mod 2=0 If the parity for the block is odd,then the data embedded is bit 1 and if the parity for the block is even ,then data embedded is bit 0. One bit is complemented if the following condition is met: SUM(Fi)mod 2=0 and embed data is 1 or SUM(Fi)mod 2=1 and embed data is 0

Block Data Hiding Method(cont.) 1 1 2 1 2 1 5 2 2 F1= Neighbour(F1)

Block Data Hiding Method(cont.) 1 2 1 5 Neighbour(F1)= F1= if embed 0 1 F1’=

Block Data Hiding Method(cont.) 1 1 3 Neighbour(F3)= F3= if embed 1 1 1 F3’= F3’’=

Block Data Hiding Method(cont.) 1 embed data 010 F1 F2 SUM(F1)=5 SUM(F3)=8 SUM(F4)=4 SUM(F1)mod 2=1 F3 F4 SUM(F3)mod 2=0 SUM(F4)mod 2=0 1 Host image 2 1 5 Neighbour(F1)=

Experimental Results Flower(128×128) Baboon(131×131) Lena（131×131）

Conclusion The main idea is to maintain the image quality while increasing the data hiding ratio. Will not downgrade the image quality based on the amount if can hide. The hidden data might easily be tampered with,if an illegal user had previous knowledge for retrieving data.