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	Strong passwords are your first step in securing your systems. If a password can be easily guessed or compromised using a simple dictionary attack, your systems will be vulnerable to hackers, worms, Trojans, and viruses.

Trojan, virus, and worm authors have had great success attacking systems with weak and/or default passwords. Take IRC/Flood Trojan for example. McAfee's virus profile states that IRCFlood has over 120 variants and has infected over 60,000 machines in the last 30 days. IRC/Flood succeeds by checking for 22 different different easy to guess admin passwords (variants vary). Unfortunately, there are a lot more where IRC/Flood came from, W32/Tzet.worm, W32/Random.worm, and W32.HLLW.Gaobot.gen are in the wild just to name three. Hackers also have no problem compromising systems with weak passwords. Programs like L0pthCrack for example make the process simple and efficient. Creating a password-cracking dictionary is not even a challenge. Type the words "Creating Password Cracking Dictionaries", without the quotes, in to your favorite search engine. A comprehensive dictionary can be downloaded or created from scratch in short order. Below is a list of commonly used weak passwords that should NEVER be used. If any of these passwords look hauntingly familiar and are being used, you need to change the password immediately.

Alpha	Weak Passwords
A	a, A.M.I, A52896nG93096a, aaa, aammii, abc, abcd, academia, academic, accept, access, ACCESS, account, accounting, action, adam, ADAMS, adfexc, adm, admin, ADMIN, Admin, admin2, administrator, Administrator, adminttd, ADMN, admn, adrian, adrianna, adtran, adult, Advance, ADVMAIL, aerobics, alfarome, ALFAROME, ALLIN1, ALLIN1MAIL, ALLINONE, aLLy, ALLy, alpha, AM, AMI, AMI!SW, AMI.KEY, AMI.KEZ, AMI?SW, AMI_SW, AMI~, AMIAMI, AMIDECOD, amipswd, AMIPSWD, AMISETUP, anicust, anon, anonymous, any@, ANYCOM, AP2SVP, aPAf, APL2PP, APPLSYS, APPS, AQDEMO, AQUSER, ARCHIVIST, Asante, ascend, Ascend, asdf, asdfgh, at4400, attack, AURORA$ORB$UNAUTHENTICATED, AURORA@ORB@UNAUTHENTICATED, autocad, AUTOLOG1, Award, award, AWARD?SW, AWARD_SW, awkward
B	BACKUP, BATCH, BATCH1, BATCH2, bbs, bciim, bciimpw, bcms, bcmspw, bcnas, bcnaspw, bell9, BIGO, bin, bintec, BIOS, BIOSPASS, biosstar, biostar, Biostar, BIOSTAR, BLAKE, blue, bluepw, boss, BRIDGE, browse, browsepw
C	c, cablecom, cable-docsis, CAROLIAN, cascade, CATALOG, cc, CCC, ccrusr, CDEMO82, CDEMOCOR, CDEMORID, CDEMOUCB, central, CHANGE_ON_INSTALL, changeme, checkfs, checkfsys, checksys, CHEY_ARCHSVR, circ, cisco, Cisco router, CLARK, client, CLOTH, cmaker, CMSBATCH, CMSUSER, CNAS, COGNOS, Col2ogro2, comcomcom, COMPANY, Compaq, Compleri, computer, CONCAT, condo, CONDO, Congress, CONV, CPNUC, CPRM, cr0wmt 911, craft, craftpw, Crystal, CSPUSER, CTX_123, CTXDEMO, CTXSYS, cust, custpw, CVIEW
D	d.e.b.u.g, d8on, daemon, Daewuu, Database, databse, DATAMOVE, Daytec, DBSNMP, DCL, DDIC, death, debug, DECMAIL, DECNET, default, DEFAULT, Dell, DEMO, demo, DEMO1, DEMO8, DEMO8, demos, deskalt, deskman, desknorm, deskres, DESQUETOP, dhs3mt, dhs3pms, diag, diamond, DIGITAL, DISC, disttech, D-Link, dn_04rjc, dni, DS, DSA
E	EARLYWATCH, echo, EMP, enable, eng, engineer, enquiry, enquirypw, enter, ESSEX, EVENT, Ezsetup
F	fal, FAX, fax, FAXUSER, FAXWORKS, FIELD, field, FIELD.SUPPORT, FINANCE, FND, foobar, friend, ftp
G	g6PJ, games, ganteng, GATEWAY, GEN1, gen1, GEN2, gen2, glftpd, gnumpf, god, godblessyou, gonzo, gopher, GPLD, gropher, guessme, guest, GUEST, Guest, guest1, GUESTGUE, guestgue, GUESTGUEST
H	h6BB, hacker, halt, HARRIS, hax0r, HELGA-S, HELLO, hello, HELP, help, HELPDESK, HEWITT RAND, hewlpack, HLT, home, Home, HOST, HP, hp, HPDESK, HPLASER, HPOFFICE, HPOFFICE DATA, HPONLY, HPP187, HPP187 SYS, HPP189, HPP196, HPWORD PUB, hydrasna
I	I5rDv2b2JjA8Mm, ibm, IBM, ibmcel, ihavenopass, ILMI, inads, indspw, INFO, informix, INGRES, init, initpw, install, Internet, IntraStack, IntraSwitch, INTX3, INVALID, IPC, IS_$hostname, ITF3000, iwill
J	j09F, j256, j262, j322, j64, JDE, Jetform, JONES
K	kermit, kiddie, komprie, ksdjfg934t
L	l2, l3, laflaf, lantronix, LASER, LASERWRITER, last, lesarotl, letacla, letmein, LIBRARY, lineprin, LINK, lkw peter, lkwpeter, LKWPETER, Lkwpeter, llatsni, locate, locatepw, login, looker, LOTUS, love, lp, lpadm, lpadmin, lucenttech1, lucenttech2, lynx
M	MAIL, mail, MAILER, maint, maintain, maintpw, man, manager, Manager, MANAGER, MANAGER.SYS, Master, MASTER, masterkey, MBIU0, MBMANAGER, MBWATCH, mcp, MDSYS, me, merlin, mfd, MFG, MGR, MGR.SYS, MICRO, MILLER, mirc, mlusr, mMmM, MMO2, MODTEST, monitor, MOREAU, mountfs, mountfsys, mountsys, MPE, mtch, mtcl, MTYSYS, my_DEMARC, mypass, mypc
N	n/a, naadmin, NAMES, ncrm, NETBASE, NETCON, NETFRAME, NetICs, netlink, netman, NETMGR, NETNONPRIV, NETOP, netopia, NETPRIV, netrangr, netscreen, NETSERVER, NETWORK, NEWINGRES, NEWS, news, NeXT, NF, NFI, NICONEX, nms, nmspw, nobody, noway, NONPRIV, ntacdmax, nuucp
O	OCITEST, oem_temp,op, OP.OPERATOR, operator, OPERATOR, OPERVAX, oracle, ORDPLUGINS, ORDSYS, OUTLN, OutOfBox, owner
P	PAPER, pass, PASS, Pass, passwd, Passwd, PASSWORD, password, Password, pat, patrick, PBX, pc, PCUSER, PDP11, PDP8, PFCUser, PHANTOM, phoenix, piranha, pmd, PO, PO8, poll, Polrty, POST, Posterie, postmast, POSTMASTER, postmaster, POWERCARTUSER, powerdown, PRIMARY, prime, primenet, primeos, primos, primos_cs, PRINT, PRINTER, PRIV, private, prost, PSEAdmin, public, PUBSUB, pw, pwd, pwp
Q	q, Q54arwms, QDI, qpgmr, qsecofr, qserv, qsrvbas, qsvr, qsysopr, quser, qwer
R	raidzone, rcust, rcustpw, RE, read, readonly, readwrite, REGO, REMOTE, replicator, REPORT, RJE, rje, RM, RMAIL, rmnetlm, RMUser1, ro, ROBELLE, ROOT, root, Root, ROOT500, ROUTER, router, RSBCMON, RSX, rw, rwa, rwmaint
S	sa, SABRE, SAMPLE, san fran 8, SAP*, satan, SCOTT, script, scriptkiddie, SECDEMO, secoff, secofr, secret, secure, security, SECURITY, SER, sertafu, server, service, SERVICE, servlet, SETUP, setup, sex, shutdown, signa, SKY_FOX, sldkj754, smile, snake, SnuFG5, software, sp99dd, Spacve, spcl, speedxess, SPOOLMAN, spooml, star, STEEL, STUDENT, su, Super, super, SUPERVISOR, support, SUPPORT, supportpw, switch, SWITCHES_SW, Sxyz, SY_MB, sybase, sync, synnet, SYS, sys, sysadm, SYSADM, sysadmin, sysbin, SYSDBA, SYSLIB, syslib, SYSMAINT, SYSMAN, Sysop, system, SYSTEM, system_admin, SYSTEST, SYSTEST_CLIG, syxz, SZYX
T	t0ch20x, t0ch88, TCH, teacher, tech, technolgi, tele, TELEDEMO, TELESUP, temp, temp1, TEST, test, testing, teX1, tiara, TIGER, tini, Tiny, tlah, topicalt, topicnorm, topicres, Toshiba, toshy99, tour, TRACE, TRACESRV, trancell, trouble, TSDEV, TSEUG, TSUSER, TTPTHA, tutor, TzqF
U	uClinux, UETP, umountfs, umountfsys, umountsys, unix, User, user, USER, USER_TEMPLATE, USER0, USER1, USER2, USER3, USER4, USER5, USER6, USER7, USER8, USER9, USERP, uucp, uucpadm, uwontguessme
V	VAX, VESOFT, Vextrex, VMS, VNC, VRR1
W	WANGTEK, web, WebAdmin, WebBoard, webdb, weblogic, webmaster, win, WINDOWS_PASSTHRU, WINSABRE, winterm, wodj, WOOD, WORD, WP, wradmin, write, www
X	xljlbj, XLSERVER, xo11nE, xp, xxx, xxxx, xxxxx, xxxxxx, xxxxxxx, xxxxxxxx, xxxxxxxxx, xyzall
Y	YES, youwontguessme, yxcv
Z	zbaaaca, Zenith, zeosx, zxcv
Numeric	0, 1, 1.1, 2, 5, 7, 12, 30, 110, 111, 123, 1111, 1234, 2002, 2003, 2222, 2600, 8429, 12345, 54321, 111111, 121212, 123123, 123456, 166816, 256256, 654321, 1234567, 1322222, 7061992, 11111111, 12345678, 19920706, 22222222, 88888888, 123456789, 1. 1, 1234qwer, 123abc, 123asd, 123qwe, 1RRWTTOOI, 240653C9467E45, 24Banc81, 3098z, 3ep5w2u, 4Dgifts, 4getme2, 4tas, 57gbzb
Other	!@#$, !@#$%, !@#$%^, !@#$%^&, !@#$%^&*, !root, $ALOC$, $secure$, $system, %username%12, %username%123, %username%1234, (none), ?award, }

Additional Information about Strong Passwords The links below contain policies, guidelines, practices, and general protection information about weak and strong passwords. Password Policy from SANS Password Security from Red Hat How to create stronger passwords from Microsoft Protecting Yourself from Password File Attacks from CERT Coordination Center

About The Author
Lew Newlin is CTO of Information Solutions, Inc. that operates SiteRecon.com. SiteRecon specializes in security, email monitoring, and web site monitoring for Internet service providers and businesses.