ㅁ What do I do with a certificate whose validity period has expired?
For certificates whose validity period has expired, you must go through the new application process again.
For businesses, the new application process for a general-purpose certificate can be found at [Business (Individual/Corporation) - Application] on our website.
For individuals, please proceed from the [Individual - Application] menu.
To apply for a new limited-use certificate, please go to the application page.

ㅁ What are the precautions when entering the certificate password?
The certificate password must be at least 10 characters long and contain at least one alphabetic letter, number, and special character.
Some special characters cannot be used as a certificate password.
The certificate password cannot contain three consecutive alphabetic characters or numbers, and a password with the same three alphabetical letters or numbers consecutively cannot be used.

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※ Source: https://www.signgate.com