[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] DAC (Discretionary Access Controls)  Daemen, Joan  daemon user  daemons  Dalheimer, Mattias K. (Running Linux)  Dalton, Chris I.  DARPA  [See ARPA] data  [See also data protection; information]     backing up  [See backups]     confidentiality of  [See confidentiality]     encryption of  [See encryption]     integrity of  [See integrity] data bits  Data Carrier Detect (DCD)  data communication equipment (DCE)  Data Encryption Algorithm (DEA)  Data Encryption Standard  [See DES] data protection  2nd  [See also backups]     eavesdropping      local storage      real-world example      sanitizing media before disposal      theft, from      unattended terminals  Data Set Ready (DSR)  data spoofing  data terminal equipment (DTE)  Data Terminal Ready (DTR)  databases  [See also network authentication systems]     network      system  date account  Dawson, Terry (Running Linux)  day-zero backup  [See level-zero backup] daytime service  2nd  dbx debugger  DCD (Data Carrier Detect)  DCE (data communication equipment)  DCE (Distributed Computing Environment)  2nd  3rd  4th  5th  6th  dd command  2nd  DDoS (Distributed Denial of Service) attacks  DEA (Data Encryption Algorithm)  deadlock  DEBUG command, SMTP  debugfs command  2nd  3rd  DECnet  decode aliases  decoy systems  decryption  default accounts  default domain  defense in depth  [See multilevel security]2nd  [See multilevel security] demo accounts  denial of service attacks  2nd      accidental      automatic account lockout      causes of      destructive  2nd      distributed (DDoS)      internal inetd services      logging to /dev/console causing      on networks      overload  2nd      security checklist for      syslog causing      types of  Denning, Dorothy E. R. (Cryptography and Data Security)  Denning, Peter J. (Computers Under Attack: Intruders, Worms, and Viruses)  Department of Justic (DOJ)  deployment environments  depository directories, FTP  DES (Data Encryption Standard)  2nd      example of      Kerberos using      key length of      NIS+      weakness of  des command  2nd  DES Extended format  The Design and Implementation of the 4.4 BSD UNIX Operating System (McKusick, Marshall Kirk; Bostic,  The Design of the UNIX Operating System (Bach, Maurice)  destroying media  destructive denial of service attacks  2nd  detectors     cable tampering      carbon monoxide      fire alarms      humidity      logging alarm systems      motion      placement and monitoring of      smoke      temperature alarms      water sensors  /dev directory     /dev/audio device      /dev/console device      /dev/kmem device  2nd      /dev/null device      /dev/random device      /dev/swap device      /dev/urandom device  device files  devices     access, legal definition of      back door in      backup, world-readable      configuring on local area network      logging information about      managing with SNMP      modem control      random number sources      superuser control of  Devices file  df -i command  dfstab file  2nd  dfstab script  DHCP protocol  dictionary attack  diff program  differential backup  differential cryptanalysis  differential fault analysis  differential power analysis  differential timing analysis  Diffie, Whitfield  2nd      "New Directions in Cryptography"      "The First Ten Years of Public-Key Cryptography"  Diffie-Hellman exponential key exchange system  2nd  3rd  4th  5th  6th  Digital Millennium Copyright Act (DMCA)  Digital Signature Algorithm (DSA)  Digital Signature Standard (DSS)  2nd  digital signatures  2nd  [See also signatures, data]     distributed with software      DSA (Digital Signature Algorithm)      DSS (Digital Signature Standard)  2nd      HMAC as alternative to      message digest algorithms used for  2nd      public key cryptography used with  2nd      RSA as basis for  directories  2nd  3rd  [See also files]     ancestor, detecting changes to      CDFs (context-dependent files)      current      FTP depositories      home          security of      links to      mounted      nested, tree structure attacks on      NFS  [See NFS]     permissions for  2nd      SGID and sticky bits on      world-writable  directory services  [See Kerberos system LDAP NIS NIS+] dired mode, GNU Emacs  Disappearing Cryptography (Wayner, Peter)  disaster planning  2nd  Disaster Recovery Journal  discard service  2nd  Discretionary Access Controls (DAC)  disk drives  [See also media]     destructive attacks to      difficulty of sanitizing      filling up, as overload attack      Firewire-based      hidden space on      logging information about      partitioning      partitions, backups by      quotas for      reserved space on      write-protect switches for  2nd  Distributed Computing Environment  [See DCE]2nd  [See DCE] Distributed Denial of Service (DDoS) attacks  DMCA (Digital Millennium Copyright Act)  DNS (Domain Name System)  2nd      attacks on      client flooding      dynamic      nameserver attacks      nameserver cache poisoning      Public Key Infrastructure (PKI)      rogue servers      security and  2nd      security precautions for      zone transfers  2nd  DNS and BIND (Albitz, Paul and Liu, Cricket)  DNSSEC  Dobbertin, Hans  documentation     of break-in      log books      log files, hardcopy of  2nd      manuals  2nd      software  DOJ (Department of Justice)  dollar sign ($), as Unix Bourne or Korn shell prompt  domain name  2nd  Domain Name System  [See DNS] domain service  2nd  domain socket  domainname command  domains (NIS)  dormant accounts      disabling automatically      disabling by changing password      finding  dot (.) directory  2nd  dot-dot (..) directory  2nd  double reverse lookup  downtime, logging  dpkg package management system  drand48() system call  Dreyfus, Suelette (Underground)  drinks, effects on hardware  DSA (Digital Signature Algorithm)  DSR (Data Set Ready)  DSS (Digital Signature Standard)  2nd  DTE (data terminal equipment)  DTR (Data Terminal Ready)  du command  due care  [See best practices] dump program  2nd  3rd  DUMP request  dumpster diving  duress code  dust, effects on hardware  DVD, mounted read-only  dynamic DNS