Views
5 years ago

x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Defense against

Defense against Davida’s attacks using a collision-resistant hash function h() : collision-resistant hash function 1.) asymmetric encryption system plaintext messages have to fulfill redundancy predicate m, redundancy � test if h(m) = redundancy 2.) digital signature system Before signing, h is applied to the message signature of m = (h(m)) s mod n test if h(m) = ((h(m)) s ) t mod n Attention: There is no proof of security (so far ?) 220

secret area plaintext x random number‘ r RSA as asymmetric encryption system encryption (r,x,h(r,x)) c mod n c, n encryption key, publicly known c(x) collision-resistant hash function h - globally known - ciphertext key generation: p, q prime number n := p�q c with gcd(c,(p -1)(q -1)) = 1 d � c -1 mod (p -1)(q -1) decryption d, n (�) d mod n =: r,x,y; if h(r,x) = y then output 2 nd component of ((r,x,h(r,x)) c ) d mod n random number decryption key, kept secret plaintext x 221

faculty of computer science - Fakultät Informatik - Technische ...
Slides - Technische Universität Dresden
Statistics beyond Physics - Technische Universität Dresden
OCL By Example Lecture - Technische Universität Dresden
Graphs - Www-st.inf.tu-dresden.de - Technische Universität Dresden
Optimierung und Frustration: - Technische Universität Dresden
Talk - Technische Universität Dresden
02 - Technische Universität Dresden
5. Adaptation - Faculty of Computer Science - Technische ...
3. Adaptation - Faculty of Computer Science - Technische ...
2. Mobile Internet - Faculty of Computer Science - Technische ...
3. Mobile Internet - Faculty of Computer Science - Technische ...
4. Context Awareness - Faculty of Computer Science - Technische ...
Wiki Event Navigation - Computer Networks - Technische Universität ...
Content Sharing - Technische Universität Dresden
SAP AG - Faculty of Computer Science
6. Context Awareness - Faculty of Computer Science - Technische ...
7. Location-based Se.. - Faculty of Computer Science - Technische ...
Computer Science and Engineering - Technische Universiteit ...
5. Location-based Se.. - Faculty of Computer Science - Technische ...
Folie 1 - Faculty of Computer Science
Folie 1 - Faculty of Computer Science
First Presentation - Faculty of Computer Science
Folie 1 - Faculty of Computer Science
X - Technische Universität Dresden
X - Technische Universität Dresden
diplomarbeit - Computer Networks - Technische Universität Dresden
Technische Universität Dresden - Computer Networks - Technische ...
M - Technische Universität Dresden
paper - Technische Universität Dresden