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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

more detailed notation

more detailed notation Domain of trust (no confidentiality needed) plaintext with signature and test result Digital signature system t key for testing of signature; publicly known key generation plaintext with signature test sign x, s(x), x, s(x) x “pass” or ��0,1� “fail” * ��0,1�l test sign x,Sig x,Sig, “pass” or “fail” test(t,x,Sig) � �pass, fail� secret area ��0,1� k area of attack ��0,1� j Show-case with lock; 1 key s gen random number r (t,s):=gen(r) key for signing; kept secret Sig:=sign(s,x,r ')) domain of trust 135 plaintext 011001011 random number ' ��0,1� * r '

Key distribution using digital signature systems 1. A registers t A the key for testing his signature (possibly anonymously). public-key register R 2. B requests the key for testing the signature of A from key register R. message from A, s A(message from A) 3. B receives key t A for testing the signature of A from R, certified by the signature of R. participant A participant B 136

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