ࡱ> >@=% Vbjbj%% ":GGblttt8L!(@@@<>>>>>>$ bbg @@wVg g g @@<g <g Dg h<@  GX`tdh<T!xC$<g NOAO Guidelines for Choosing a Good Password It is easy to break into any account with a bad password. Such break-ins compromise the whole system, so all users must bear the responsibility of choosing good passwords. The best passwords contain a mixture of uppercase letters, lowercase letters, numbers and punctuation (e.g. lap5Dog%, Whoosh?, sUpEr8, BIGpig!!). The first characters of a memorable phrase in mixed case with additional numbers/punctuionation would make a good password. For example, Mary had a little lamb: 5Mhall! Long passwords are better than short passwords. Unfortunately, on our old Suns, characters beyond the 8th character are ignored. So use an eight character password on systems such as Tucsons Orion, Gemini and Ursa and 10 character passwords (or longer!) on modern Linux/FreeBSD systems (such as Tucsons Taurus and Crux) and on your Windows or Mac desktop and laptop.A password should be at least six characters long, preferably seven or eight. Anything beyond eight characters will be ignored. Any typeable characters are acceptable. So mix in some numbers and punctuation marks. The case of a letter is significant (e.g. Sparc and sparc are different. This is generally true in Unix). DO NOT use anything that can be found in any dictionary (e.g. vorticity, encomia, Mervin are obscure but they occur in common dictionaries so they should be avoided). This includes foreign words, slang, jargon, and proper names (e.g. sayonara, reboot, Keohane). Avoid any names, words, numbers or abbreviations that can be found in your personal data (e.g. social security numbers, maiden names, name of relatives, any dates). Avoid passwords that can be guessed by knowing something personal about you. This includes nicknames, names of pets, names of significant others, anything from your favorite TV show (Trekkies beware!), your favorite book, lines from your favorite songs, etc. (e.g. Picard, NCC1701D, Sparky). Avoid simple variants or permutations of any of the above (e.g. S's replaced by 5's, E's replaced by 3's, O's replaced by 0's, your name backwards or shifted, your login name repeated or backwards). Avoid using text messaging codes! DO NOT share your password or write it down anywhere accessible. System Administrators can give you a new temporary password if you forget it. You must change this immediately, using the UNIX passwd program or the Mac or Windows9x/NTs password changing procedure. Change your password periodically: . At least twice a year but probably not more frequently than every 30 days lest you forget your password. Users who have accounts at other sites should use a unique password for each account, in order to contain the damage done if one of the passwords is compromised. Yes, I realize that this can drive a user crazy, ; but it is really important! Do not use any passwords used in this document ! From Solaris 8s man passwd: Passwords must be constructed to meet the following requirements: Each password must have PASSLENGTH characters, where PASSLENGTH is defined in /etc/default/passwd and is set to 6. Only the first eight characters are significant. Each password must contain at least two alphabetic characters and at least one numeric or special character. In this case, "alphabetic" refers to all upper or lower case letters. Each password must differ from the user's login name and any reverse or circular shift of that login name. For comparison purposes, an upper case letter and its corresponding lower case letter are equivalent. New passwords must differ from the old by at least three characters. For comparison purposes, an upper case letter and its corresponding lower case letter are equivalent. 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