Synology DiskStation User Manual page 74

Apply Password Strength Rules
You can enable password strength service to make sure DSM users' password is secure enough to withstand
malicious login attempt.
Note:
 Password Strength rules only work for passwords created or modified after the Password Strength service is
enabled. Existing passwords won't be affected by the rules.
 The rules won't apply to the passwords of users created by importing users list.
To apply password strength rules:
1 Click
2 Tick
3 Tick any of the following rules:

Exclude name and description of user from
description.

Mixed

Included numeric

Included special
%, ^, &, *, (, ), -, _, =, +, [, {, ], }, \, |, ;, :, ', ", <, >, /, ?).

Minimum password
number between 6 and 127.
4 Click Apply.
To cancel password strength rules:
1 Click
2 Uncheck
3 Click Apply.
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Password Strength.
Apply password strength rules.
case: The password must contain mixed case letters.
character: The password must contain at least one numeric character (0~9).
character: The password must contain at least one special character (i.e., ~, `, !, @, #, $,
length: The password must be longer than the specified value. The length should be a
Password Strength.
Apply password strength
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password: The password must not contain user name or
rules.
Synology DiskStation User's Guide
Based on DSM 3.1