The use of a passphrase instead of a password enhances security by providing a more complex and longer sequence of characters, which is more difficult for an attacker to guess or crack. This higher complexity typically comes from the use of a phrase with multiple words, often including spaces and punctuation, which makes it significantly more secure than single-word passwords that might be more vulnerable to brute force or dictionary attacks. Single-factor authentication, such as a user ID and password combination, is less secure than multifactor methods. Regular password changes can be beneficial, but without the implementation of complex requirements, they do not significantly enhance security. Logging access attempts provides an audit trail but does not inherently secure authentication.