[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] hacker challenges  The Hacker Crackdown: Law and Disorder on the Electronic Frontier (Sterling, Bruce)  hackers  2nd  [See also intruders]     as security consultants  Hackers: Heroes of the Computer Revolution (Levy, Steven)  Hafner, Katie (Cyberpunk: Outlaws and Hackers on the Computer Frontier)  Haley, Chuck  Halon gas  halt command  handheld computers  Harbison, Samuel P. (C, a Reference Manual)  hard disks  [See disk drives] hard links  [See links] hardcopy device  [See printers] hardcopy of log files  2nd  3rd  [See also media, printed] hardware  [See also devices; disk drives; laptops]     auditing user access to      backing up  [See backups]     bugs in      cables, cutting as destructive attack      environmental dangers affecting      failure of      importance of protecting      local storage of secondary equipment      locking      logging information about      modems      physical access to  2nd      placement of      power loss, as destructive attack      read-only protection      tagging      tape drives  2nd  3rd      temperature effects on      terminals         secure  2nd          unattended  2nd      theft of  2nd  3rd      trusting  2nd      unplugging to get rid of intruder  hardware tokens  hash functions  [See message digest functions] hash mark (#)     disabling services with      Unix superuser prompt  Hash Message Authentication Code (HMAC)  Hawking, Stephen W. (A Brief History of Time: From the Big Bang to Black Holes)  header, packet  Hein, Trent R. (UNIX System Administration Handbook)  Hellman, Martin E.      "Hiding Information and Signatures in Trap Door Knapsacks"      "New Directions in Cryptography"      "On the Security of Multiple Encryption"  HELO command, SMTP  HELP command, SMTP  2nd  HF200 gas  HFS filesystem  HFS+ filesystem  hidden files     created by intruders      listing  hidden space  High Technology Crimes Investigation Association (HTCIA)  hijacking Telnet sessions  Hinsley, F. H. (Code Breakers: The Inside Story of Bletchley Park)  historical accounts  history files  hit lists of passwords  HMAC (Hash Message Authentication Code)  Hoffman, Lance J.     Building in Big Brother: The Cryptographic Policy Debate      Rogue Programs: Viruses, Worms and Trojan Horses  holes, security  [See security holes] home directories  2nd  HOME variable, attacks through  The Honeynet Project  honeypots  host authentication, SSH  host command  host-based firewall program  2nd  host-based IDS  hostnames      controlling access to      determining from IP addresses      name service and      underscore character in  hosts      monitoring with netstat      NIS passwords for      trusted  hosts file  2nd  Hosts table (NIS+)  hosts.allow file  2nd  3rd  hosts.deny file  2nd  3rd  hosts.equiv file  2nd  3rd  hosts.lpd file  Hoyt, D. B. (Computer Security Handbook)  HTCIA (High Technology Crimes Investigation Association)  HTTP (Hypertext Transfer Protocol)  2nd  3rd  http group  http user  HTTPS (secure HTTP)  2nd  humidity  Hunt, A. E. (Computer Security Handbook)  Hunt, Craig (TCP/IP Network Administration)  hybrid public/private cryptosystems  Hypertext Transfer Protocol  [See HTTP]