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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Key distribution using

Key distribution using asymmetric encryption systems 1. A registers his public encryption key c A (possibly anonymously). public-key register R 2. B asks the key register R for the public encryption key of A. c A(message to A) participant A participant B 133 3. B gets the public encryption key c A of A from R, certified by R‘s signature.

more detailed notation Symmetric authentication system k key generation plaintext plaintext with authenticator test: plaintext and test result x encode x, k(x) MAC = k(x) ? x, code secret area =:MAC (message authentication code) Show-case with lock; 2 identical keys k gen random number r k:=gen(r) Domain of trust secret key Domain of trust “pass” or “fail” MAC:=code(k,x) MAC = code(k,x) Area of attack ? 134

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