A Data-Hiding Technique With Authentication, Integration, and Confidentiality for Electronic Patient Records Chao, Hui-Mei, Hsu, Chin-Ming, and Miaou,

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Presentation transcript:

A Data-Hiding Technique With Authentication, Integration, and Confidentiality for Electronic Patient Records Chao, Hui-Mei, Hsu, Chin-Ming, and Miaou, Shaou-Gang, IEEE Transactions on Information Technology in Bimedicine, VOL. 6, NO. 1, MARCH 2002, pp. 46-53 Adviser : Dr. Chang, Chin-Chen Reporter : Chi, Kang-Liang Date : 2003/04/08 2003/04/08

Outline Introduction Bipolar TER Multiple-Base Algorithm ( TER : Tolerant Error Range ) Data-Hiding Methods Experimental Results Conclusions 2003/04/08

Introduction 2003/04/08

Bipolar TER Multiple-Base Algorithm Multiple-base sequences are –3, 7, 8, -4, 5, … The number 500 Since |(-3)*7*8| 500 < |(-3)*7*8*(-4)|, then the four numbers –3, 7, 8, -4 would be used as the bases for 500 , and the number “4” is stored in the key chain . 2003/04/08

Bipolar TER Multiple-Base Algorithm 500 = 4*125+0 125 = 8*15+5 15 = 7*2+1 2 = 3*0+2 (2)*7*8*4+(1)*8*4+(5)*4+(0)=500 The temporary converted values would be 2150. 2003/04/08

Bipolar TER Multiple-Base Algorithm (-3, 7, 8, -4)+(2, 1, 5, 0)*sign(-3, 7, 8, -4) = (-1, 6, 3, -4) A new bipolar TER base (-1, 6, 3, -4) is obtained . 2003/04/08

Data-Hiding Methods (1) Hiding a Digital Signature : 2003/04/08

Data-Hiding Methods 2003/04/08

Data-Hiding Methods (2) Hiding a Diagnostic Report or a Segment of ECG signal . 2003/04/08

Data-Hiding Methods Hiding a Diagnostic Report : Ex : 216 = 13*16+8 |13| 13 < |13*10| 13 = 10*1+3 1 = 13*0+1 (1)*10+(3)=13 (13, 10)+(1, 3)*sign(13, 10) = (14, 13) Using (14, 13) to modify the bipolar TER base . 2003/04/08

Data-Hiding Methods Hiding a Segment of ECG Signal : Data of the most frequently appeared are assigned to be zeros as a base-line value . Using Bipolar TER Multiple-Base Algorithm to modify the bipolar TER base . 2003/04/08

Experimental Results Table I Performance of hidden and JPEG decompressed images in terms of PSNR in decibels Table II Performance of hidden and JPEG decompressed images terms of the variance of TER 2003/04/08

Experimental Results Table III Comparison of the conventional encryption/decryption method and the proposed method 2003/04/08

Conclusions Different sizes of key and mark images are generated when different data are encrypted . Less processing time is needed . The confidentiality can be achieved by decrypting the entire message not only with digital signatures, but also with the exact copy of the original mark image and hidden image . The authentication can be provided with several objects . 2003/04/08