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Why Cryptography
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Security Provided by Computer Operating Systems How Operating Systems Work Default OS Security: Permissions Attacks on Passwords Attacks That Bypass Operating Systems Data Recovery Attack Memory Reconstruction Attack Added Protection Through Cryptography The Role of Cryptography in Data Security
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Symmetric-Key Cryptography
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Some Crypto Jargon What Is a Key Why Is a Key Necessary Generating a Key A Random Number Generator A Pseudo-Random Number Generator Attacks on Encrypted Data Attacking the Key Breaking the Algorithm Measuring the Time It Takes to Break Your Message Symmetric Algorithms: The Key Table Symmetric Algorithms: Block Versus Stream Ciphers Block Ciphers Stream Ciphers Block Versus Stream: Which Is Better Digital Encryption Standard Triple DES Commercial DES Replacements Advanced Encryption Standard
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Contents
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Summary Real-World Example: Oracle Databases 51 51
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Symmetric-Key Management
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Password-Based Encryption Programming Convenience Breaking PBE Slowing Down an Attack on a Password Good Passwords Password Generators Hardware-Based Key Storage Tokens Crypto Accelerators Hardware Devices and Random Numbers Biometrics Summary Real-World Examples Keon Desktop Other Products
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The Key Distribution Problem and Public-Key Cryptography 81
83 84 85 86 88 91 92 93 94 98 105 111 117 117 119 120 122 122
Sharing Keys in Advance Problems With This Scheme Using a Trusted Third Party Problems With This Scheme Public-Key Cryptography and the Digital Envelope Security Issues Breaking a Public-Key Algorithm Some History of Public-Key Cryptography How Public-Key Cryptography Works The RSA Algorithm The DH Algorithm The ECDH Algorithm Comparing the Algorithms Security Key Sizes Performance Transmission Size Interoperability
Contents
Protecting Private Keys Using the Digital Envelope for Key Recovery Key Recovery via a Trusted Third Party Key Recovery via a Group of Trustees Key Recovery via Threshold Schemes How a Threshold Scheme Works Summary Real-World Example
122 123 124 126 127 130 132 133
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The Digital Signature
138 141 145 148 149 153 154 156 159 159 160 161 163 163 163 164 165 165 166 166 169 169 170
The Uniqueness of a Digital Signature Message Digests Collisions The Three Important Digest Algorithms A Representative of Larger Data Data Integrity Back to Digital Signatures Trying to Cheat Implementing Authentication, Data Integrity, and Nonrepudiation Understanding the Algorithms RSA DSA ECDSA Comparing the Algorithms Security Performance Transmission Size Interoperability Protecting Private Keys Introduction to Certificates Key Recovery Summary Real-World Example
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Public-Key Infrastructures and the X.509 Standard
172 174 175 177
Public-Key Certificates Unique Identifiers Standard Version 3 Certificate Extensions Entity Names
VIII
Contents
ASN.1 Notation and Encoding The Components of a PKI Certification Authority Registration Authority Certificate Directory Key Recovery Server Management Protocols Operational Protocols Registering and Issuing Certificates Revoking a Certificate Certificate Revocation Lists Suspending a Certificate Authority Revocation Lists Trust Models Certificate Hierarchies Cross-Certification X.509 Certificate Chain The Push Model Versus the Pull Model Managing Key Pairs Generating Key Pairs Protecting Private Keys Managing Multiple Key Pairs Updating Key Pairs Keeping a History of Key Pairs Deploying a PKI The Future of PKI Roaming Certificates Attribute Certificates Certificate Policies and Certification Practice Statements Summary Real-World Examples Keon Certificate Server Keon Web PassPort 179 179 180 180 181 182 182 184 184 185 186 190 190 191 192 193 194 195 196 197 197 198 199 200 201 201 201 203 204 206 206 207 207
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Network and Transport Security Protocols
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Internet Protocol Security IP Security Architecture IPSec Services The Authentication Header Protocol Integrity Check Value Calculation
Contents
Transport and Tunnel Modes The Encapsulating Security Payload Protocol Encryption Algorithms ESP in Transport and Tunnel Modes Security Associations Combining Security Associations Security Databases Security Policy Database Security Association Database Key Management Internet Key Exchange Secure Sockets Layer The History of SSL Session and Connection States The Record Layer Protocol The Change Cipher Spec Protocol The Alert Protocol The Handshake Protocol The Client Hello Message The Server Hello Message The Server Certificate Message The Server Key Exchange Message The Certificate Request Message The Server Hello Done Message The Client Certificate Message The Client Key Exchange Message The Certificate Verify Message The Finished Message Ending a Session and Connection Resuming Sessions Cryptographic Computations Encryption and Authentication Algorithms Summary Real-World Examples
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