Clicking on the button 
results in the opening of: Read preview window with the tab: Certificates verifying the digital signature.
After that an information to the signature validity will appear in the field below.
Refer to the text below for detailed information to the respective positions and fields within the signature verification window. Mind that the structure of the information for driver data varies from the same for vehicle data:
The driver card data contain two certificates, which validity is checked upon each download.
The check is performed by computing the checksums for the data files downloaded from the driver’s card (or saved onto the hard drive) and comparing them with the checksums computed by the card processor.
Repeat the download from the driver card when one of the signatures is invalid.
Download files with invalid signatures are useless even if saved onto the hard disc!!!
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After opening and decoding the certificate, particular digital signatures of files on the card are being checked.
An example of a correct verification of digital signatures:
Application identification: OK
Card Certificate: OK
CA Certificate: OK
Identification : OK
Events Data : OK
Faults Data : OK
Driver Activity data : OK
Vehicles Used : OK
Places : OK
Specific conditions : OK
Control Activity Data : OK
Certificate contents:
European Key:
Key number : 00
Issuing authority:
Certificate type : Certification Authority
End of validity : 2013-02-24 00:00:00
Issued by : European Community
Country : Poland
Key serial number : 00
Certificate contents:
CAR : FD45432000FFFF01
CHA : FF544143484F00
CHR : 28504C2000FFFF01
Driver card certificate:
European key:
Key number : 00
Issuing authority:
Certificate type : Driver Card
End of validity : 2011-08-24 23:59:59
Issued by : Poland
Key serial number : 08
Certificate number:
CAR : 28504C2000FFFF01
CHA : FF544143484F01
CHR : 1000273E08068081
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Explanation to particular sections:
| • | Application Identification (Application_Identification) – information concerning identification of application on the card, |
| • | Card certificate (EF Card_Certificate) - certificate of card’s public key, |
| • | CA certificate (EF CA_Certificate) - certificate of the certification authority, |
| • | Identification (ID) - information containing identification details of a card (card no., name and surname of driver, etc.) |
| • | Events (Events_Data) - information containing annotated events (card withdrawal, driving without card, etc.) |
| • | Faults (Faults_Data) - information about detected faults (power supply interruption, etc.) |
| • | Driver activities (Driver_Activity_Data) - information to performed activities by the driver (driving, rest, etc.) |
| • | Vehicles (Vehicles_Used) - information to vehicles driven by this driver (reg. no., etc.), |
| • | Places (Places) - information where the daily work periods begin and/or end work (country, time, etc.) |
| • | Specific conditions (Specific_Conditions) - ferry/train (manual input of the driver) |
| • | Control activity data (Control_Activity_Data) - information concerning carried out inspections. |
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The vehicle data files contain two certificates, which validity is checked upon each download.
The check is performed by computing the checksums for the data files downloaded from the driver’s card (or saved onto the hard drive) and comparing them with the checksums computed by the tachograph processor.
Repeat the download from the tachograph when one of the signatures is invalid.
Download files with invalid signatures are useless even if saved onto the hard disc!!!
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After that an information to the signature validity will appear in the field below.
 | | Fig. Example of the digital signature verification window. |
Explanation to particular sections:
| • | Overview - information concerning tachograph identification, |
| • | Activities - driver activities of a specified date (driving, rest, etc.), |
| • | Events and faults - information about registered events and faults (card withdrawal, current supply interruption, etc.), |
| • | Speed - details about speed, |
| • | Technical data - technical data about the tachograph; |
| • | no data - no data entry on the selected day; |
| • | no activities - the selected day was blocked with a foreign card of a company. |
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