{"id":6782,"date":"2025-05-12T17:48:23","date_gmt":"2025-05-12T17:48:23","guid":{"rendered":"https:\/\/podpisano-new.local\/?p=6782"},"modified":"2025-05-12T17:50:07","modified_gmt":"2025-05-12T17:50:07","slug":"uslugi-zaufania-cyfrowego-i-konserwacja-podpisu-kwalifikowanego","status":"publish","type":"post","link":"https:\/\/podpisano.pl\/en\/uslugi-zaufania-cyfrowego-i-konserwacja-podpisu-kwalifikowanego\/","title":{"rendered":"Digital trust services - how to ensure the long-term validity of qualified signatures?"},"content":{"rendered":"
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What are digital trust services?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Digital trust services are a set of solutions that provide <\/span>security and exchange of information and documents in electronic form<\/b>. These include. <\/span>qualified electronic signatures<\/b>, <\/span>qualified electronic seals<\/b> and <\/span>qualified time stamps<\/b>. According to the law, these tools guarantee documents <\/span>integrity and authenticity<\/b>, which means that the content of the document has not been changed and the identity of the signers has been verified. Thanks to the regulation eIDAS<\/a> An electronic signature has the legal force equivalent to a handwritten signature, making it possible to <\/span>Use of electronic documents on a par with paper documents<\/b> In all EU countries.<\/span><\/p>\n

Examples trust services<\/a> are the issuance of qualified signature certificates, e-signature submission and verification services, time stamping services or qualified <\/span>electronic deliveries<\/b>. The increasing use of these services in business and government is due to the time and money savings that digital documents provide. <\/span>Electronic document bearing a qualified signature or e-signature<\/b> can replace the paper document in many procedures, as long as its reliability is maintained over time. The key challenge then becomes <\/span>long-term maintenance of the validity of such signatures<\/b>, especially in the context of archiving electronic documents.<\/span><\/p>\n

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Qualified electronic signature - validity period and archiving challenges\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A qualified electronic signature is based on a qualified certificate issued by a certified trust service provider for a specified period of time - usually <\/span>1 year, 2 years or 3 years<\/b>. During this period, the certificate is valid, and any document signed during this period is considered to bear the <\/span>valid signature<\/b>. Verification systems can easily confirm the validity of the signature <\/span>only during the validity of the certificate<\/b>. Once the certificate expires, the situation becomes more complicated -. <\/span>document remains legally signed<\/b>, because the signature was valid at the time of submission, but <\/span>proving this fact years later may be difficult<\/b>, if additional safeguards are not taken care of.<\/span><\/p>\n

In practice, this means that if we electronically sign a contract and then <\/span>signature certificate will expire<\/b>, then years later, verification tools may indicate the signature as \u201einvalid\u201d (e.g., due to an invalid certificate or lack of up-to-date revocation lists). Such a situation happened to Mr. John, who signed an electronic contract with a valid signature and kept the document in the archive, but <\/span>forgot to renew the certificate<\/b>. When there was litigation with the contractor a year later, it proved difficult to prove in court that the contract had been signed at a time when John's certificate was valid. <\/span>In other words, the failure to prepare the document for long-term storage undermined its evidentiary power.<\/span><\/i><\/p>\n

This example shows the main challenge: <\/span>How to ensure the long-term validity of an electronic signature?<\/b> The solution is to use <\/span>additional security mechanisms for electronically signed documents<\/b>. The most important of these is <\/span>qualified time stamp<\/b>, which clearly confirms the date and time of the signature. If Mr. Jan had stamped the agreement with a time stamp, the problem of determining the date of signing would not have occurred at all.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Timestamp - the foundation of long-term reliability\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Qualified timestamp<\/b> is a service that <\/span>confirms the existence of the document at a specific point in time<\/b> by attaching a time signature from a trusted time source. The timestamp provider uses an independent, synchronized time source, which guarantees the objectivity of that date. Placing a timestamp on a signed file allows the <\/span>precisely determine the date of signing the electronic document<\/b>, even if the qualified signature or seal certificate later expired.<\/span><\/p>\n

The timestamp \u201efreezes\u201d the status of the document and signature at the time of application. Thus, when the signature needs to be verified many years later, we can show that the <\/span>the signature existed and was valid at the designated time<\/b>. This is crucial for <\/span>legal force<\/b> electronic documents stored for the long term. In practice, a good rule of thumb is to add a timestamp <\/span>directly during the signing of the document<\/b> - then we confirm that the document was signed within the validity period of the certificate. If we plan to store e-documents for many years (e.g. <\/span>5 years or more<\/b>), the use of a time stamp and further maintenance activities even becomes essential.<\/span><\/p>\n

It is worth noting that <\/span>time stamp qualified<\/b> itself is <\/span>trust service<\/b> - is issued by a qualified provider and thus enjoys a presumption of correctness. It forms the basis of the signature maintenance process, which we describe below.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Qualified signature maintenance - what does it consist of?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Electronic signature maintenance<\/b> is nothing more than <\/span>Expanded use of timestamps in the signature lifecycle<\/b>, aimed at <\/span>maintaining the validity and evidentiary force of the signature for a long period of time<\/b>. In the definition it is <\/span>more advanced time stamping<\/b>, which allows you to confirm that <\/span>The qualified certificate was valid at the time the e-document was signed<\/b>. In other words, maintenance provides proof that the signature was made within the validity period of the certificate, even if many years have passed since then. This service works especially well for <\/span>archiving a large number of files stored for a long time<\/b> - For example, in corporate or official archives, where documents must remain valid for 5, 10 or even 50 years.<\/span><\/p>\n

During the maintenance of the e-signature, the following occurs <\/span>cyclic and automatic addition of time stamps<\/b> To already signed documents, <\/span>at strictly defined intervals<\/b> (e.g., every year). Each subsequent timestamp re-certifies the current state of the signature and certificate, thereby extending the period during which the document can be securely verified. This makes it much easier to maintain electronic archives of documents whose <\/span>validity cannot be challenged<\/b> Even after years. In practice, maintenance includes not only adding tags, but also <\/span>verification of the status of certificates<\/b> (checking for invalidation, such as with CRLs or OCSP services) and <\/span>secure document storage<\/b> In archiving repositories. The combination of these measures ensures that the electronic signature retains its <\/span>cryptographic and legal reliability<\/b> Throughout the archiving period.<\/span><\/p>\n

Importantly, professional maintenance often involves the use of <\/span>the most up-to-date cryptographic standards<\/b>. Each subsequent timestamp is based on currently secure algorithms and keys, which <\/span>protects the signature from future decryption (security breaches) or data integrity violations<\/b>. Even if the original signature algorithm had weakened over time (e.g., methods of breaking it emerged), the subsequent <\/span>time stamps<\/b> using newer algorithms will secure the document. As a result, electronically signed documents can remain valid for very long periods, even if the original cryptographic mechanisms are no longer secure.<\/span><\/p>\n

Summary, maintenance of qualified signatures is a good archiving practice, especially for documents of great evidentiary or legal importance to a company or office. As experts point out, regular maintenance of signature -. <\/span>For example, by adding timestamps and using other security mechanisms<\/b> - is the key to avoiding legal problems and ensuring the authenticity of documents on the many years<\/a>.<\/span><\/p>\n

These \u201eother mechanisms\u201d may include:<\/span><\/p>\n