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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Sym. encryption system:

Sym. encryption system: Domain of trust key generation k key generation Domain of trust secret key Domain of trust plaintext encryption ciphertext k(x) decryption k random number plaintext x x =k -1 (k(x)) secret area Area of attack Domain of trust: encrypter, decrypter, or key exchange center 131

more detailed notation Domain of trust r ' plaintext Asymmetric encryption system c encryption key, publicly known key generation encryption ciphertext c(x) decryption d random number plaintext x x enc S dec =d(c(x)) random number ' secret area Area of attack gen Opaque box with spring lock; 1 key r (c,d):=gen(r) Domain of trust decryption key, kept secret S:=enc(c,x,r ') x:=dec(d,S)=dec(d,enc(c,x,r ')) 132

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