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# Index: I

I/O : (see input/output)
ICMP (Internet Control Message Protocol) : 16.2.4.1. ICMP
IDEA (International Data Encryption Algorithm)
  6.4.1. Summary of Private Key Systems
  6.6.3.1. Encrypting files with IDEA
identd daemon : 17.3.12. Identification Protocol (auth) (TCP Port 113)
identification protocol : 17.3.12. Identification Protocol (auth) (TCP Port 113)
identifiers : 3.1. Usernames
IEEE Computer Society : F.1.7. IEEE Computer Society
IFS variable
  5.5.3.2. Another SUID example: IFS and the /usr/lib/preserve hole
  23.4. Tips on Writing SUID/SGID Programs
  attacks via : 11.5.1.2. IFS attacks
ignore (in Swatch command) : 10.6.2. The Swatch Configuration File
immutable files : 9.1.1. Immutable and Append-Only Files
importing NIS accounts
  19.4.1. Including or excluding specific accounts:
  19.4.4.2. Using netgroups to limit the importing of accounts
in.named daemon : 16.2.6.1. DNS under UNIX
includes : (see server-side includes)
Includes option : 18.3.2. Commands Within the <Directory> Block
IncludesNoExec option : 18.3.2. Commands Within the <Directory> Block
incremental backups : 7.1.3. Types of Backups
indecent material : 26.4.5. Pornography and Indecent Material
index.html file, absence of : 18.2.2.2. Additional configuration issues
inetd daemon
  17.1.2. Starting the Servers
  17.1.3. The /etc/inetd Program
  -nowait option : 25.3.1. Service Overloading
  -t (trace) option : 10.3.6. Logging Network Services
  denial-of-service attacks : 17.1.3. The /etc/inetd Program
inetd.conf file
  11.5.3.2. inetd.conf
  17.3. Primary UNIX Network Services
information : (see data)
init program
  5.3.2. Common umask Values
  C.5.1. Process #1: /etc/init
initialization vector (IV) : 6.4.4.2. DES modes
initializing
  environment variables : 11.5.2.7. Other initializations
  system, files for : 11.5.3.5. System initialization files
inittab program
  14.5.1. Hooking Up a Modem to Your Computer
  C.5.1. Process #1: /etc/init
INND program : 17.3.13. Network News Transport Protocol (NNTP) (TCP Port 119)
inodes
  5.1. Files
  5.1.2. Inodes
  change time : (see ctime)
  for device files : 5.6. Device Files
  problems with : 25.2.2.3. Inode problems
input/output (I/O)
  checking for meta characters : 23.2. Tips on Avoiding Security-related Bugs
  portable library : 1.3. History of UNIX
insects : 12.2.1.7. Bugs (biological)
installing
  cables : 12.2.4.2. Network cables
  Kerberos : 19.6.3. Installing Kerberos
  logging installations : 10.7.2.1. Exception and activity reports
  physical security plan for : 12.1.1. The Physical Security Plan
insurance
  26.1. Legal Options After a Break-in
  26.2.6. Other Tips
integrity
  2.1. Planning Your Security Needs
  9. Integrity Management
  9.3. A Final Note
  11.1.5. Viruses
  12.3. Protecting Data
  12.3.6. Key Switches
  Kerberos : 19.6.1.3. Authentication, data integrity, and secrecy
  management checklist : A.1.1.8. Chapter 9: Integrity Management
  Secure RPC : 19.3.4. Limitations of Secure RPC
  software for checking : 19.5.5. NIS+ Limitations
international cryptography export
  6.4.4.1. Use and export of DES
  6.7.2. Cryptography and Export Controls
International Data Encryption Algorithm (IDEA)
  6.4.1. Summary of Private Key Systems
  6.6.3.1. Encrypting files with IDEA
Internet
  16.1.1. The Internet
  18. WWW Security
  (see also World Wide Web)
  addresses
    16.2.1. Internet Addresses
    16.2.1.3. CIDR addresses
  daemon : (see inetd daemon)
  domain as NIS domain : 19.4.3. NIS Domains
  firewalls : (see firewalls)
  servers : (see servers, Internet)
  Worm program : 1. Introduction
  Worm program Worm program : 23.1.1. The Lesson of the Internet Worm
Internet Control Message Protocol (ICMP) : 16.2.4.1. ICMP
Internet Packet Exchange (IPX) : 16.4.1. IPX
Internet Relay Chat (IRC) : 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)
Internet Security Scanner (ISS) : 17.6.2. ISS
intruders : 1. Introduction
  confronting : 24.2.2. What to Do When You Catch Somebody
  creating hidden files : 24.4.1.7. Hidden files and directories
  discovering
    24.2. Discovering an Intruder
    24.2.6. Anatomy of a Break-in
  legal options regarding : 26.1. Legal Options After a Break-in
  responding to
    24. Discovering a Break-in
    24.7. Damage Control
  tracking from log files : 24.3. The Log Files: Discovering an Intruder's Tracks
ioctl system call : C.1.3.4. Process groups and sessions
IP addresses
  controlling access by : 17.2. Controlling Access to Servers
  name service and
    16.2.6. Name Service
    16.2.6.2. Other naming services
  restricting access by : 18.3. Controlling Access to Files on Your Server
IP numbers, monitoring : 12.3.1.2. Eavesdropping by Ethernet and 10Base-T
IP packets
  16.2. IPv4: The Internet Protocol Version 4
  16.2.4. Packets and Protocols
  16.2.4.3. UDP
  eavesdropping : 16.3.1. Link-level Security
  monitoring : 12.3.1.2. Eavesdropping by Ethernet and 10Base-T
  sniffing
    16.3.1. Link-level Security
    17.3.3. TELNET (TCP Port 23)
IP protocols
  1.4.3. Add-On Functionality Breeds Problems
  16.2.4. Packets and Protocols
  16.2.4.3. UDP
IP security
  16.3. IP Security
  16.3.3. Authentication
IP services : (see network services)
IP spoofing
  1.4.3. Add-On Functionality Breeds Problems
  16.3. IP Security
IPv4 (IP Version 4)
  16.2. IPv4: The Internet Protocol Version 4
  16.2.6.2. Other naming services
IPX (Internet Packet Exchange) : 16.4.1. IPX
IRC (Internet Relay Chat) : 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)
IRIX wtmpx file : 10.1.2. utmp and wtmp Files
ISS (Internet Security Scanner)
  17.6.2. ISS
  E.4.4. ISS (Internet Security Scanner)

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