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Security in Computer Networks Multi
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Areas of Teaching and Research •
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5/48 Examples of changes w.r.t. ano
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The massmedia „newspaper“ will
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Multimedia Forensics
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Multimedia Forensics
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Areas of Teaching and Research •
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15 General Aims of Education in IT-
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General Aims of Education in IT-sec
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General Aims of Education in IT-sec
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…but no this way! First stupid an
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Aims of Education: Offers by other
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3 Cryptographic basics Table of Con
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History of Communication Networks (
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Important Terms computers interconn
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threats: Threats and corresponding
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confidentiality integrity availabil
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commands universal universal Trojan
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Which protection measures against w
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money time Considered maximal stren
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Strength of the attacker (model) At
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Electromagentic radiation >dir AUTT
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Why should I protect myself... ? ..
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Previously on Security and Cryptogr
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Multilateral security (2nd version)
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Prevent the unintended Achieve the
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Protection Goals: Definitions Confi
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Correlations between protection goa
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Physical security assumptions Each
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Shell-shaped arrangement of the fiv
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Golden rule Correspondence between
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66 Lookahed: Why autentication: Adm
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PIN protects access to chip New Ger
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Identification of IT-systems by IT-
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- Page 71 and 72: One-way functions - cryptographic h
- Page 73 and 74: MD5 Hash in the Wild • United Sta
- Page 75 and 76: mission statement:= “USCYBERCOM p
- Page 77 and 78: Password based authentication • E
- Page 79 and 80: Remaining problems of password base
- Page 81 and 82: • main idea: Cryptanalytic Time -
- Page 83 and 84: • 2 nd example - breaking of PINs
- Page 85 and 86: Remaining problems of password base
- Page 87 and 88: Remaining problems of password base
- Page 89 and 90: Password based authentication • S
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- Page 93 and 94: Password based authentication • s
- Page 95 and 96: Password based authentication • s
- Page 97 and 98: Password based authentication • p
- Page 99 and 100: Password based authentication • (
- Page 101 and 102: • OTP Implementations - hash chai
- Page 103 and 104: Biometrics: Physiological / Behavio
- Page 105 and 106: • Enrolment phase: • Verificati
- Page 107 and 108: • Pros: Biometrics: Pros and Cons
- Page 109 and 110: • Pros: Biometrics: Pros and Cons
- Page 111 and 112: • Pros: Biometrics: Pros and Cons
- Page 113 and 114: ROC Curve and Security Problems of
- Page 115 and 116: Enhanced Security: Multi-biometric
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- Page 119: Further problems 1. Specify exactly
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- Page 125 and 126: more detailed notation Symmetric en
- Page 127 and 128: Key exchange using symmetric encryp
- Page 129 and 130: more detailed notation Domain of tr
- Page 131 and 132: more detailed notation Symmetric au
- Page 133 and 134: Key distribution using digital sign
- Page 135 and 136: Whom are keys assigned to? Comments
- Page 137 and 138: severity a) passive a1) ciphertext-
- Page 139 and 140: Basic facts about “cryptographica
- Page 141 and 142: Grundlagen - Sicherheit kryptograph
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- Page 145 and 146: Hybrid cryptosystems (2) Even more
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- Page 149 and 150: ciphertext S 00 01 10 11 equally di
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- Page 153 and 154: Definition for information-theoreti
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- Page 157 and 158: Symmetric authentication systems (2
- Page 159 and 160: About cryptographically strong syst
- Page 161 and 162: clear: in NP � but difficulty can
- Page 163 and 164: Search of prime numbers (1) 1. Are
- Page 165 and 166: Z n : ring of residue classes mod n
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- Page 169 and 170: Compose ? Calculating with and with
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Calculating with and without p,q (7
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Calculating with and without p,q (9
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Calculating with and without p,q (1
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Calculating with and without p,q (1
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Calculating with and without p,q (1
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184 The s 2 -mod-n-Pseudo-random Bi
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s 2 -mod-n-generator as symmetric e
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s 2 -mod-n-generator as asymmetric
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Security of the s 2 -mod-n-generato
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Security of PBGs more precisely (1)
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Security of PBGs more precisely (3)
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constructive proof often Scheme of
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Alg.2: has to demand uniformity Why
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GMR - signature system (2) Construc
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To factor is difficult (1) Theorem:
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Solution of problem 1 (1) Tree of r
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Note In the proof you dispose the
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Key generation 1) Choose two prime
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Proof (2) Holds, of course, for m
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secret area plaintext x random numb
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secret area text with signature and
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( x s ) Attack on digital signature
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Active Attack of Davida against RSA
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secret area plaintext x random numb
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Faster calculation of the secret op
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64-bit block plaintext L 0 IP round
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L i-1 L i = R i-1 Decryption Why do
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Generation of a key for each of the
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L i-1 One round complement compleme
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Generalization of DES 1.) 56 � 16
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e.g. 64 bits with DES ECB Main prob
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Cipher Block Chaining (CBC) All lin
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� plaintext block n memory for ci
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Block length a Length of the output
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shift register 1 b CFB for authenti
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Plain Cipher Block Chaining (PCBC)
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Utilization of indeterministic bloc
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Diffie-Hellman key agreement (1) pr
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andom number 1 Domain of trust secr
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Find a generator in cyclic group Z
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x, s(x), “pass” or “fail” r
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Signature system for blindly provid
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Reconstruction of the secret: Thres
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adio television videophone phone in
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adio television videophone phone in
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Since about 1990 reality Video-8 ta
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Problems with exchanges Unsolved pr
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Questions: Attacker (-model) • Ho
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Questions: Attacker (-model) • Ho