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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Basics

Basics of Cryptology Achievable protection goals: confidentiality, called concealment integrity (= no undetected unauthorized modification of information), called authentication Unachievable by cryptography: availability – at least not against strong attackers 127

more detailed notation Symmetric encryption system k ciphertext k(x) key generation Domain of trust secret key Domain of trust plaintext local computer HW: no side-channels operating system Windows 95/98/ME/CE/XP Home E., MacOS 9.x: all programs Opaque box with lock; 2 identical keys k gen random number x encryption decryption x =k -1 dec (k(x)) enc S r k:=gen(r) S:=enc(k,x) x:=dec(k,S)=dec(k,enc(k,x)) secret area Area of attack NSA: Bad Aibling ... Law enforcement: wiretapping interface plaintext 128

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