Password Generator Details about the built-in password generator of KeePass.

• Generation Based on Character Sets
• Generation Based on Patterns
• Generating Passwords that Follow Rules
• Security-Reducing Options
• Configuring Settings of Automatically Generated Passwords for New Entries

  Generation Based on Character Sets

This password generation method is the recommended way to generate random passwords. Other methods (pattern-based generation, ...) should only be used if passwords must follow special rules or fulfill certain conditions.

Generation based on a character set is very simple. You simply let KeePass know which characters can be used (i.e. upper-case letters, digits, ...) and KeePass will randomly pick characters out of the set.

Defining a Character Set:
The character set can be defined directly in the password generator window. For convenience, KeePass offers adding commonly used ranges of characters to the set. This is done by ticking the appropriate check box. Additionally to these predefined character ranges, you can specify characters manually: all characters that you enter in the 'Also include the following characters' edit box will be directly added to the character set.

Character Sets are Sets:
In mathematical terms, character sets are sets, not vectors. This means that characters can not be added twice to the set. Either a character is in the set or it is not.

For example, if you enter 'AAAAB' into the additional characters box, this is exactly the same set as 'AB'. 'A' will not be 4 times as likely as 'B'! If you need to follow rules like 'character A is more likely than B', you must use pattern-based generation + permuting password characters.

KeePass will 'optimize' your character set by removing all duplicate characters. If you'd enter the character set 'AAAAB' into the additional characters box, close and reopen the password generator, it'll show the shorter character set 'AB'. Similarly, if you tick the Digits check box and enter '3' into the additional box, the '3' will disappear because it is already included in the Digits character range.

  Generation Based on Patterns

The password generator can create passwords using patterns. A pattern is a string defining the layout of the new password.

The \ placeholder is special: it's an escape character. The next character that follows the \ is written directly into the generated password. If you want a \ in your password at a specific place, you have to write \\.

Using the {n} code you can define how many times the previous placeholder should occur. The { } operator duplicates placeholders, not generated characters. Examples:
» d{4} is equivalent to dddd,
» dH{4}a is equivalent to dHHHHa and
» Hda{1}dH is equivalent to HdadH.

The [...] notation can be used to define a custom character set, from which the password generator will pick one character randomly. All characters between the [ and ] brackets follow the same rules as the placeholders above. Examples:
» [dp] generates exactly 1 random character out of the set digits + punctuation,
» [d\m\@]{5} generates 5 characters out of the set "0123456789m@",
» [u\_][u\_] generates 2 characters out of the set upper case + '_'.

More examples:

ddddd
Generates for example: 41922, 12733, 43960, 07660, 12390, 74680, ...

\H\e\x\:\ HHHHHH
Generates for example: 'Hex: 13567A', 'Hex: A6B99D', 'Hex: 02243C', ...

Common Password Patterns:

  Generating Passwords that Follow Rules

Below are a few examples how the pattern generation feature can be used to generate passwords that follow certain rules.

Important! For all of the following examples you must enable the 'Randomly permute characters of password' option!

  Security-Reducing Options

The password generator supports several options like 'No repeating characters'. These options are reducing the security of generated passwords. You should only enable them if you are forced to follow such rules by the website/application, for which you are generating the password.

The options can be found in the 'Advanced' dialog / tab page.

KeePass 1.x Only

If you enable a security-reducing option, the 'Advanced' button
in the password generator window is shown in red.

KeePass 2.x Only

If you enable a security-reducing option, an exclamation mark (!)
is appended to the 'Advanced' tab.

  Configuring Settings of Automatically Generated Passwords for New Entries

When you create a new password entry, KeePass will automatically generate a random password for the new entry. The properties of these generated passwords can be configured in the password generator dialog.

To configure, open the password generator dialog and select all the options you wish (character set, pattern, etc.). Then, click the leftmost button right of the profile selection dropdown box (the one that looks like a disk with a pen on it). In the dialog that opens, click the dropdown arrow of the combo box and choose '(Automatically generated passwords for new entries)', then click the [OK] button.

Disabling Automatically Generated Passwords:
To disable automatically generated passwords for new entries, open the password generator dialog, select 'Generate using character set' and specify 0 as password length. As above, overwrite the appropriate profile.