M - Technische Universität Dresden

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Offline payment system Payment systems with security by Deanonymizability k security parameter I identity of the entity giving out the banknote r i randomly chosen (1 ≤ i ≤ k) C commitment scheme with information theoretic secrecy blindly signed banknote: s Bank (C(r 1 ), C(r 1 ⊕ I ), C(r 2 ), C(r 2 ⊕ I ), ..., C(r k ), C(r k ⊕ I )), recipient decides, whether he wants to get revealed r i or r i ⊕ I. (one-time pad preserves anonymity.) Hand-over to two honest recipients: probability ( i : bank gets to know r i and r i ⊕ i ) ≥ 1-e -c•k ∃ (original owner identifiable) 96
legal certainty vs. liability online / offline Outlook debit = pre-paid / pay-now / credit only special software or hardware, too ? universal means of payment or multifaceted bonus systems ? one or multiple currencies ? one or multiple systems ? 97
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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
Page 45 and 46: Indirect re-encryption scheme for r
Page 47 and 48: d s k s 3 3 Indirect re-encryption
Page 49 and 50: Indirect re-encryption scheme maint
Page 51 and 52: Breaking the direct RSA-implementat
Page 53 and 54: Fault tolerance in MIX-networks (1)
Page 55 and 56: attacker model expense per user Com
Page 57 and 58: OSI layers 7 application 6 presenta
Page 59 and 60: Tolerating errors and active attack
Page 61 and 62: Network structure • • Solution
Page 63 and 64: Time-slice channels (1) station R M
Page 65 and 66: Connection configuration later (1)
Page 67 and 68: Query and superpose to receive the
Page 69 and 70: 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: 95 Secure and anonymous digit. paym
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 122 and 123: (Im-)Possibility to regulate anonym
Page 124: (Im-)Possibility to regulate anonym
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M - Technische Universität Dresden

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