Your optional passphrase can include the following characters:

• Uppercase letters: A-Z
• Lowercase letters: a-z
• Numbers: 0-9
• Special characters:
  
  !\"#$%&'()*+,-./:;<=>?^[\\]@_{|}
   
• Spaces: A space “˽” is also possible.

By using a mix of these characters, you can create a strong and secure passphrase.