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M - Technische Universität Dresden

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cover!<br />

emb!<br />

Key exchange for steganography !<br />

Diffie-Hellman Public-Key Agreement<br />

secret: x<br />

public: g x<br />

C<br />

y<br />

g y<br />

(g y ) x = g yx = g xy = (g x ) y<br />

f(C, g yx ) = f(S, g xy )<br />

key!<br />

stegotext!<br />

embedding! extracting!<br />

sender! recipient!<br />

attacker!<br />

S<br />

key!<br />

cover*!<br />

emb!<br />

117

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