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7.4. Payment Card Industry Data Security Standard (PCI DSS) .......................................... 110
7.5. Security Technical Implementation Guide ................................................................... 110
8. References 111
A. Encryption Standards 113
A.1. Synchronous Encryption ........................................................................................... 113
A.1.1. Advanced Encryption Standard - AES ............................................................. 113
A.1.2. Data Encryption Standard - DES .................................................................... 113
A.2. Public-key Encryption ............................................................................................... 114
A.2.1. Diffie-Hellman ................................................................................................ 114
A.2.2. RSA .............................................................................................................. 115
A.2.3. DSA .............................................................................................................. 115
A.2.4. SSL/TLS ....................................................................................................... 115
A.2.5. Cramer-Shoup Cryptosystem ......................................................................... 115
A.2.6. ElGamal Encryption ....................................................................................... 116
B. Revision History 117
- Red Hat Enterprise Linux 6 1
- Security Guide 1
- Edition 1.5 2
- 1. Document Conventions 7
- 1.2. Pull-quote Conventions 8
- 2. We Need Feedback! 9
- Security Overview 11
- 1.1.1.2. Security Today 12
- 1.1.2. SELinux 13
- 1.1.3. Security Controls 13
- 1.1.4. Conclusion 14
- 1.2. Vulnerability Assessment 15
- 1.2.3. Evaluating the Tools 17
- 1.2.3.2. Nessus 18
- 1.2.3.3. Nikto 18
- 1.3.1.1. Shades of Gray 19
- 1.3.2.1.1. Broadcast Networks 20
- 1.3.3.2. Unpatched Services 21
- 1.3.4.1. Bad Passwords 22
- 1.5. Security Updates 25
- 1.5.4. Applying the Changes 27
- Applying the Changes 29
- Securing Your Network 31
- /sbin/grub-md5-crypt 32
- 2.1.3. Password Security 33
- 2.1.3.2.2. Passphrases 37
- 2.1.3.2.3. Password Aging 37
- 2.1.4.1. Allowing Root Access 39
- 2.1.4.3. Limiting Root Access 42
- 2.1.4.3.2. The sudo Command 43
- 2.1.5.1. Risks To Services 44
- 2.1.5.3. Insecure Services 46
- 2.1.6. Personal Firewalls 47
- 2.2. Server Security 48
- 220-Hello, %c 49
- 2.2.1.2.1. Setting a Trap 50
- 2.2.2. Securing Portmap 52
- 2.2.3. Securing NIS 52
- 255.255.255.0 192.168.0.0 54
- 2.2.4. Securing NFS 55
- UserDir enabled 56
- UserDir disabled root 56
- 2.2.6. Securing FTP 57
- 2.2.6.2. Anonymous Access 58
- 2.2.6.3. User Accounts 58
- 2.2.7. Securing Sendmail 59
- 2.2.7.3. Mail-only Users 60
- 2.3. TCP Wrappers and xinetd 61
- 2.3.1. TCP Wrappers 62
- [root@myServer ~]# 63
- 2.3.2.1.1. Wildcards 65
- 2.3.2.1.4. Operators 67
- 2.3.2.2. Option Fields 68
- 2.3.2.2.4. Expansions 69
- 2.3.3. xinetd 70
- 2.3.4.3.1. Logging Options 72
- 2.3.5. Additional Resources 75
- 2.3.5.3. Related Books 76
- 2.4.1. How Does a VPN Work? 77
- 2.4.2. Openswan 77
- 2.4.2.3. Commands 78
- 2.5. Firewalls 79
- 2.5.1. Netfilter and IPTables 81
- 2.5.2.3. Trusted Services 83
- 2.5.2.4. Other Ports 83
- 2.5.3. Using IPTables 84
- 2.5.5. FORWARD and NAT Rules 86
- 2.5.5.2. Prerouting 88
- 2.5.5.3. DMZs and IPTables 88
- 2.5.8. IPv6 90
- 2.5.9. Additional Resources 90
- 2.6. IPTables 91
- 2.6.2.2. Command Options 94
- 2.6.2.4.1. TCP Protocol 97
- 2.6.2.4.2. UDP Protocol 98
- 2.6.2.4.3. ICMP Protocol 98
- 2.6.2.5. Target Options 99
- 2.6.3. Saving IPTables Rules 101
- 2.6.5. IPTables and IPv6 104
- 2.6.6. Additional Resources 104
- Encryption 105
- 3.5. Virtual Private Networks 106
- 3.6. Secure Shell 106
- 3.7. OpenSSL PadLock Engine 106
- 3.8. LUKS Disk Encryption 107
- Important 108
- 3.8.5. Links of Interest 109
- Security 113
- Secure Installation 115
- Software Maintenance 117
- 7.1. Introduction 119
- (NISPOM) 120
- References 121
- A.1. Synchronous Encryption 123
- A.2. Public-key Encryption 124
- A.2.2. RSA 125
- A.2.3. DSA 125
- A.2.4. SSL/TLS 125
- A.2.6. ElGamal Encryption 126
- Appendix B. Revision History 127
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