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(Im-)Possibility to regulate anonymous/pseudonymous communication • Explicit techniques (you already know the theory) • Workarounds 122
(Im-)Possibility to regulate anonymous/pseudonymous communication Anon-Proxies" MIXes" Cascade: AN.ON" P2P: TOR" All this exists abroad without regulation – as long as we do not have a global home policy# 123
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Security in Computer Networks Multi
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Equivalence of Encryption Systems a
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message 1 message 2 message 3 messa
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Invisible implicit addresses using
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Fault tolerance (and countering mod
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time Proof of anonymity for a RING
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S i-1 Two RINGs operating if no fau
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..... ... ..... ... ..... ... stati
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S 1 S 2 S 3 S 4 S 5 0 1 0 0 0 0 1 0
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S 1 S 1 (X+Y)-X = Y Pairwise superp
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S 1 S 2 S 3 S 4 S 5 7 1 15 1 4 1 1
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local superposition mod 2 L 0 1 ...
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Proof of sender anonymity: proposit
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Information-theoretic anonymity in
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t-s t-s Let t-s be the first point
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31 Blob := committing to 0 or 1, wi
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Blobs based on asymmetric encryptio
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Checking the behavior of the statio
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Fault tolerance: 2 modes of operati
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Protection of the communication rel
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Properties of MIXes MIXes should be
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Maximal protection Pass through MIX
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Indirect re-encryption scheme for r
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d s k s 3 3 Indirect re-encryption
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Indirect re-encryption scheme maint
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Breaking the direct RSA-implementat
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Fault tolerance in MIX-networks (1)
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attacker model expense per user Com
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OSI layers 7 application 6 presenta
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Tolerating errors and active attack
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Network structure • • Solution
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Time-slice channels (1) station R M
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Connection configuration later (1)
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Query and superpose to receive the
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Outlook (1) Using the network trans
Page 71 and 72: Radio networks (1) Difference to wi
Page 73 and 74: No movement profiles in radio netwo
Page 75 and 76: Security properties of digital paym
Page 77 and 78: Pseudonyms: Linkability in detail D
Page 79 and 80: 79 Pseudonyms: Use across different
Page 81 and 82: Authenticated anonymous declaration
Page 83 and 84: Security for completely anonymous b
Page 85 and 86: Security for completely anonymous b
Page 87 and 88: P Z B P Z ¬ Basic scheme of a secu
Page 89 and 90: p B [ 3 ] p B E (Y,t) p Z B (X,t)
Page 91 and 92: x, (h(x)) s text with signature and
Page 93 and 94: p B ¬ authentication of ownership
Page 95 and 96: 95 Secure and anonymous digit. paym
Page 97 and 98: legal certainty vs. liability onlin
Page 99 and 100: Role pseudonyms (business-relations
Page 101 and 102: Cryptography and the impossibility
Page 103 and 104: cover! emb! key! Steganography key!
Page 105 and 106: cover! emb! key! Steganography Steg
Page 107: Proposals to regulate cryptography
Page 110 and 111: Key Escrow encryption without perma
Page 112 and 113: Key Escrow encryption without perma
Page 114 and 115: Symmetric authentication → Encryp
Page 116 and 117: Key exchange without message exchan
Page 118 and 119: Digital Signatures Key Escrow witho
Page 120 and 121: Encryption# symmetric # Authen-# (M
Page 124: (Im-)Possibility to regulate anonym
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M - Technische Universität Dresden

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