Invalid digital signature: Causes and solutions

Causes and how to fix invalid digital signature error

There are many reasons that lead to invalid digital signatures or digital signatures not being found when declaring and paying taxes electronically.

Saco synthesis has 4 typical causes below:

Enter wrong pin code

Entering the wrong pin code is a common problem that many people encounter when using digital signatures to declare and pay taxes electronically. In this case, you need to check whether you have entered the correct pin code, typed in Vietnamese, or if the computer is on Caps Lock, if so, turn it off.

Note that most USB Tokens only allow users to enter the wrong PIN code for a limited number of times (about 5 times). If you enter the wrong PIN more than the specified number of times, the system will lock your digital signature. At this time, you need to contact the digital signature provider for support to unlock and retrieve the password.

The digital signature driver is faulty.

When your USB Token has been used for a long time, it is easy to cause the digital signature driver to fail.

To fix the Driver signature error, you can follow the instructions below:

• Step 1: Find the digital signature drive in My Computer (usually has the name and logo of the digital signature provider)
• Step 2: Find the setup.exe file, then click to open the file and select Install.

Here are some cases you need to pay attention to:

• The device has installed Token driver but is having an error, please remove the file and reinstall it.
• If you cannot remove the old Token driver, use Unlocker to delete the installation folder, then copy the setup folder on another computer and paste it into the computer.
• user's computer, finally remove the old Token driver and reinstall it.
• If the USB Token is not available on your drive, go to the supplier's website and download it, then install it on your computer.

Insert USB Token into wrong company

If you insert the USB Token into the wrong company to declare or insert it correctly but enter it into another company's tax payment account, it will also lead to an invalid digital signature or no digital signature found.

In this situation, please check again to see if you have inserted the USB Token into the correct company or logged into the correct tax payment account. It is best to mark or note the company name on the USB Token shell to avoid confusion for the next time.

Serial does not match

Specifically, the serial number declared on the Account declaration page and the serial number on the USB Token do not match. The reason may be because your USB Token has just been renewed or initialized, at this time the USB Token device will automatically update the serial number to ensure security and prevent the digital signature from being stolen.

In this case, you need to change the declared serial number on the Account declaration page to synchronize with the serial number on your USB Token.

Instructions on how to update digital signature serial number

After checking whether the computer has received the digital signature or not, check to see if the provider's digital signature icon has appeared on the computer's Taskbar. If not, you need to re-insert the USB Token and reinstall the file in the My Computer digital signature drive.

At this point, when the computer has received the digital signature, you proceed to declare normally. If the system still reports: Invalid digital signature - Incorrect digital signature, you will have to update the digital signature serial number on the tax page account.

The steps to update the digital signature serial number on the tax page account are as follows:

• Step 1: Access the tax page and log in to the management account
• Step 2: Select “Account Management” then select “Change service information”
• Step 3: In the "Service - Electronic tax payment" section, select "Change service information"
• Step 4: Select “Change CKS” and update the new digital signature information, then click “Continue”
• Step 5: Check the information on the "Register to change and supplement electronic tax transaction information" form. After confirming that the information on the form is correct, select "Sign and send".
• Step 6: Enter the PIN code into the box on the screen window and press “Accept”
• Step 7: Click OK when the “Digital signature successful” window appears.

Once the process is complete, you have successfully changed the digital signature serial number on your tax account. Now, continue with your unfinished work of submitting your online tax return.

Thus, Saco Inc has just helped you answer information related to invalid digital signature errors or digital signature not found during the process of online tax declaration. Hopefully, the article will help you "solve" quickly when encountering this situation. If you have any questions, please contact Saco Inc for timely advice and support.

Good luck!