F5 A Steganographic Algorithm
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1 F5 A Steganographic Algorithm High Capacity Despite Better Steganalysis 1
2 Outline Benefits of F5 Properties of existing tools From Jsteg to F5 How secure is F5? My challenge to you 2
3 Benefits of F5 High steganographic capacity High efficiency via matrix encoding Prevents visual attacks Resistant to statistical attacks (chi square) Uses JPEG as carrier (common in s) Source code publicly available 3
4 Existing Steganographic Tools Their properties: High capacity Weak against visual and statistical attacks Remove significant image content Overwrite LSBs Way out? Dilute the changes less capacity Different embedding operation Different carrier medium 4
5 From Jsteg to F5 Jsteg Easily detected by statistical attacks JPEG compression Embedding function of Jsteg F4 (improved embedding operation) F5 (advanced efficiency) Permutative straddling Matrix encoding 5
6 Statistical Attack on Jsteg Jsteg is safely detected by statistical attack. Message M/uogOCS n21otxc Probability of embedding.4.2 Steganogram Size of sample (%)
7 . JPEG Coefficients 8 x 8- Bild = c 1 + c c 64 7
8 Discrete Cosine Transformation 64 brightness values 19 nonzero s 8
9 Algorithm Jsteg Frequency of occurrence Frequency of occurrence 5, 4, 3, 2, 1, 5, 4, 3, 2, 1, in carrier medium bit value to embed in steganogram steganographic value skip skip 1 1 9
10 Algorithm F3 Frequency of occurrence Frequency of occurrence 5, 4, 3, 2, 1, 5, 4, 3, 2, 1, in carrier medium bit value to embed shrinkage shrinkage in steganogram steganographic value skip 1 1
11 Algorithm F4 Frequency of occurrence 5, 4, 3, 2, 1, steganographic steganographic 1 Frequency of occurrence 5, 4, 3, 2, 1, in carrier medium bit value to embed shrinkage shrinkage... in steganogram steganographic value skip
12 How F4 Embeds 111 Steganographic interpretation Positive coefficients: LSB Negative coefficients: inverted LSB Skip, adjust coefficients to message bit Decrement positive coefficients Increment negative coefficients Repeat if shrinkage occurs
13 Continuous Embedding Changes reside packed at the start of the file (marked with pink) Attacks profit from the high change density 13
14 Algorithm F5: Straddling Permutation equalises the change density Scatters the message more uniformly than Key-driven distance schemes Parity block schemes Independent of message length 14
15 F5 Uses Matrix Encoding Embed k bits by changing one of n = 2 k 1 places: k n change density embedding rate embedding efficiency % 1 % % 66.7 % % 42.9 % % 26.7 % 4.3 k n > k 15
16 Implementation of F5 Quality Secret message DCT Discrete cosine transformation Q Quantisation P Permutation E Embedding function H Huffman coder PRG Pseudo random number generator Bitmap DCT Q P E P 1 H JPEG file (Steganogram) Password PRG Password-driven permutation Pseudo one time pad for uniformly distributed message Matrix encoding with minimal embedding rate Core embedding operation like F4 16
17 Capacity and Efficiency of F5 Large carrier medium expo.bmp (1526 KB) Clean JPEG (8 % Quality) Maximum embedded expo8.jpg (127 KB) maxisteg.jpg (113 KB) Size: 16 KB, i. e. 13 % Efficiency: 1.5 bits per change (incl. shrinkage) Short message embedded ministeg.jpg (127 KB) Size:.2 KB Efficiency: 3.7 bits per change (incl. shrinkage) Without matrix encoding twice as much changes Clean JPEG (75 % Quality) expo75.jpg (113 KB) 17
18 Characteristic Properties Frequency of occurrence 5, 4, 3, 2, 1, P(X=1) > P(X=2) > P(X=3) > P(X=4) P(X=1) P(X =2) > P(X =2) P(X=3) > P(X=3) P(X=4) 18
19 Conclusion High steganographic capacity still possible High efficiency (embed more bits per change) Resistant against statistical attack (chi square) Uses a common carrier medium (JPEG) Publicly available source code 19
20 Further Work High steganographic capacity (13 % of a JPEG) stronger attacks possible? Finer gradation of embedding efficiency by (d max, n, k) matrix encoding with d max > 1 too complex (too slow)? westfeld@inf.tu-dresden.de 2
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