{"id":7038,"date":"2025-06-24T14:48:48","date_gmt":"2025-06-24T12:48:48","guid":{"rendered":"https:\/\/podpisano-new.local\/?p=7038"},"modified":"2025-06-27T11:12:41","modified_gmt":"2025-06-27T09:12:41","slug":"podpis-pieczec-i-znacznik-czasu-jak-dzialaja-uslugi-zaufania-cyfrowego","status":"publish","type":"post","link":"https:\/\/podpisano.pl\/en\/podpis-pieczec-i-znacznik-czasu-jak-dzialaja-uslugi-zaufania-cyfrowego\/","title":{"rendered":"Signature, seal and timestamp - how do digital trust services work?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"7038\" class=\"elementor elementor-7038\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-dc68e6e e-con-full e-flex e-con e-child\" data-id=\"dc68e6e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-bb58e09 e-con-full e-flex e-con e-child\" data-id=\"bb58e09\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6178315 elementor-widget elementor-widget-text-editor\" data-id=\"6178315\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Dealing with official or business matters <\/span><b>paperless<\/b><span style=\"font-weight: 400;\"> is becoming the norm. We sign contracts online, issue invoices electronically, send important documents by e-mail. But how do we make sure that these digital documents are reliable and their content intact? With the help of <\/span><a href=\"https:\/\/podpisano.pl\/en\/czy-podpisano-pl-to-firma-zaufania-cyfrowego-rozwiewamy-watpliwosci\/\"><b>digital trust services<\/b><\/a><span style=\"font-weight: 400;\"> - a set of tools that guarantee the security and authenticity of e-documents. Although it sounds technical, in practice it is about digital equivalents of the solutions we are familiar with: a handwritten signature, a company stamp, a date stamp or a registered letter - only that in an electronic edition.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cc78597 elementor-widget elementor-widget-heading\" data-id=\"cc78597\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What are digital trust services?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f86aa6c elementor-widget elementor-widget-text-editor\" data-id=\"f86aa6c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Put simply, <\/span><b>digital trust services<\/b><span style=\"font-weight: 400;\"> are tools and technologies that provide <\/span><a href=\"https:\/\/podpisano.pl\/en\/uslugi-zaufania-cyfrowego-i-konserwacja-podpisu-kwalifikowanego\/#:~:text=Us%C5%82ugi%20zaufania%20cyfrowego%20to%20zestaw,r%C3%B3wni%20z%20papierowymi%20we%20wszystkich\"><b>integrity and authenticity<\/b><\/a><span style=\"font-weight: 400;\"> documents and electronic communications. They allow us to trust that the e-document has not been altered and that the identity of the signer has been verified. Regulation <\/span><b>eIDAS<\/b><span style=\"font-weight: 400;\"> (EU Regulation) has given these services a legal framework - for example, qualified electronic signatures have been recognized as equivalent to handwritten signatures in all EU countries. What specific solutions do we count as trust services? Here are the most important ones:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qualified Electronic Signature (QES)<\/b><span style=\"font-weight: 400;\"> - The digital equivalent of a handwritten signature. It is assigned to an individual and is based on a qualified certificate. <\/span><b>Qualified signature<\/b><span style=\"font-weight: 400;\"> is the highest type of e-signature, legally recognized as much as the<\/span><a href=\"https:\/\/podpisano.pl\/en\/uslugi-zaufania-cyfrowego-klucz-do-bezpieczenstwa-w-sieci-kompletny-przewodnik\/#:~:text=\"><span style=\"font-weight: 400;\"> handwritten signature<\/span><\/a><span style=\"font-weight: 400;\">. It allows contracts and electronic documents to be signed with the same legal force as on paper - provided the technical and legal requirements are met (certificate, identity verification, etc.).<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qualified electronic seal<\/b><span style=\"font-weight: 400;\"> - An electronic stamp of an organization (company, office). It works similarly to a signature, but is used by legal entities to confirm the <\/span><b>integrity and origin<\/b><span style=\"font-weight: 400;\"> document. It's a digital company stamp that guarantees that the document actually came from the institution in question and has not been modified after being stamped.<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qualified electronic time stamp<\/b><span style=\"font-weight: 400;\"> - kind of <\/span><b>digital \u201edate picker\u201d<\/b><span style=\"font-weight: 400;\"> or notarized time stamp. It is a service that attaches to a document <\/span><b>reliable date and time<\/b><span style=\"font-weight: 400;\"> coming from a verified source, confirming the existence of the document at any given time. This protects against <\/span><b>antidating<\/b><span style=\"font-weight: 400;\"> documents or questioning when exactly the signature was affixed. In other words, the time stamp is evidence, <\/span><i><span style=\"font-weight: 400;\">when<\/span><\/i><span style=\"font-weight: 400;\"> The document was signed.<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qualified electronic delivery<\/b><span style=\"font-weight: 400;\"> - Registered digital delivery service. This is the equivalent of a registered letter, only that in the electronic world. It allows sending and receiving electronic documents with official confirmation of sending and receiving. In Poland, such services include. <\/span><b>e-Delivery<\/b><span style=\"font-weight: 400;\">, introduced by the Law on Electronic Delivery. They allow important letters to be delivered digitally, with legal force comparable to traditional registered mail.<\/span><\/li><\/ul><p>\u00a0<\/p><p><i><span style=\"font-weight: 400;\">(Note: The eIDAS regulation also lists website authentication certificates as a trust service, although in the context of this article we focus mainly on electronic document services).<\/span><\/i><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">The increasing use of these services is due to the time savings and convenience offered by digital documents. <\/span><b>E-signatures and e-seals<\/b><span style=\"font-weight: 400;\"> allow you to get things done remotely, without printing and hand-signing piles of papers. An electronic document bearing a qualified signature or seal can replace a paper document in many procedures - provided, of course, that it remains reliable over time.  And here we come to the crux of the problem: <\/span><b>how to guarantee long-term validity<\/b><span style=\"font-weight: 400;\"> Such signed files? After all, a document signed today must be <\/span><b>verifiable<\/b><span style=\"font-weight: 400;\"> and also important in a few or several years, especially when we store it in an archive. This is the key challenge in the world of digital documents.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3070046 elementor-widget elementor-widget-heading\" data-id=\"3070046\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Qualified electronic signature - legal power and time limitations\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d610f1f elementor-widget elementor-widget-text-editor\" data-id=\"d610f1f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><b>Qualified Electronic Signature (QES)<\/b><span style=\"font-weight: 400;\"> is based on a qualified certificate issued by a trust service provider for a specified period of time - usually one, two or three years. During the validity period of the certificate, any document signed with this signature is treated as a <\/span><b>validly signed<\/b><span style=\"font-weight: 400;\">. Verification systems easily confirm the validity of the e-signature <\/span><b>during the validity of the certificate<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><span style=\"font-weight: 400;\">The problem arises <\/span><b>after the expiration of the certificate<\/b><span style=\"font-weight: 400;\">. The document still <\/span><b>remains legally signed<\/b><span style=\"font-weight: 400;\">, after all, the signature was valid at the time of submission - but proving this fact years later may prove difficult if additional safeguards are not taken care of. Figuratively speaking: an e-signature has its \u201eexpiration date\u201d depending on the certificate. When a certificate expires, after a certain period of time, programs may start reporting a message at verification that <\/span><b>signature is invalid<\/b><span style=\"font-weight: 400;\"> Or \u201euncertain.\u201d Why? Because its certificate has expired, and the system is not sure if the signature was actually made before it happened, or if the document was signed <\/span><i><span style=\"font-weight: 400;\">only then<\/span><\/i><span style=\"font-weight: 400;\"> (with an already invalid certificate). It sounds absurd, but such warning signals give us the tools to verify when additional data confirming the time of the signature is missing.<\/span><\/p><p><span style=\"font-weight: 400;\">To better illustrate the problem, let's use an example. <\/span><b>Mr. Jan<\/b><span style=\"font-weight: 400;\"> podpisano a valid contract with a qualified e-signature and quietly kept the file on his computer. Mr. John's certificate, however, expired after a year, and our hero had not applied any additional security measures. After several months, there was a court dispute with the contractor, and suddenly it turned out that the verification software indicated the signature in the contract as \u201einvalid\u201d - the certificate was no longer valid, there were no current revocation lists, in a word, the signature seemed to have \u201etime-barred\u201d. The court doubted whether the contract was actually podpisano while Mr. John's certificate was valid, because there was no evidence in the file of a specific date for the signature. In short, <\/span><b>Failure to prepare the document for long-term storage undermined its evidentiary value<\/b><span style=\"font-weight: 400;\"> - Mr. Jan <\/span><a href=\"https:\/\/podpisano.pl\/en\/elektroniczny-znacznik-czasu-czym-jest-jak-dziala-i-dlaczego-warto-go-uzywac-2-2\/\"><span style=\"font-weight: 400;\">did not take care<\/span><\/a><span style=\"font-weight: 400;\">, so that in the future you can prove the validity of your e-signature.<\/span><\/p><p><span style=\"font-weight: 400;\">This example emphatically shows that <\/span><b>Electronic signature is not \u201edisposable\u201d<\/b><span style=\"font-weight: 400;\"> - if the document is to retain legal force, we need to think about its verifiability <\/span><b>over the years<\/b><span style=\"font-weight: 400;\">. Fortunately, there is a way to do it.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-87e436e elementor-widget elementor-widget-heading\" data-id=\"87e436e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Qualified timestamp - the guardian of signature reliability\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fc2234f elementor-widget elementor-widget-text-editor\" data-id=\"fc2234f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><b>Solution<\/b><span style=\"font-weight: 400;\"> Mr. John's problem (and anyone else who wants to store e-documents for a long time) is <\/span><a href=\"https:\/\/podpisano.pl\/en\/elektroniczny-znacznik-czasu-czym-jest-jak-dziala-i-dlaczego-warto-go-uzywac-2-2\/\"><b>qualified time stamp<\/b><\/a><span style=\"font-weight: 400;\">. This is nothing more than a special, trusted <\/span><b>time stamp<\/b><span style=\"font-weight: 400;\">, which confirms the date and time when the document was signed. The timestamp provider uses an independent, synchronized time source - so the timestamp is objective and reliable. When we stamp a signed file with a timestamp, even if the signer's certificate later expires or is revoked, we have a <\/span><b>ironclad proof<\/b><span style=\"font-weight: 400;\">, that the signature existed and was <\/span><b>valid at the moment marked by the date<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><span style=\"font-weight: 400;\">Figuratively speaking, the timestamp <\/span><b>\u201efreezes\u201d the state of the document and signature<\/b><span style=\"font-weight: 400;\"> at the time it was applied. Years later, when verification is needed, it can be shown that the signature was valid at the time indicated - just as a date-stamped photograph confirms what something looked like at the time. In a world of e-documents, this is crucial to maintaining <\/span><b>legal force<\/b><span style=\"font-weight: 400;\"> long-stored files. Good practice even says to <\/span><b>add a time stamp right away when signing the document<\/b><span style=\"font-weight: 400;\"> - then we have confirmation from the beginning that the signature was made when the certificate was valid. If Mr. John had stamped his contract with a qualified timestamp, his problem probably would not have occurred - the date of the signature would have been unambiguously confirmed.<\/span><\/p><p><span style=\"font-weight: 400;\">However, will it last forever? A single time stamp perfectly <\/span><b>documents the moment of signature<\/b><span style=\"font-weight: 400;\">, but if you plan to store an e-document for many years (e.g., 5, 10, or even 50), one stamp alone may not be enough. In a few years, technologies, security algorithms or certification policies may change. Therefore, in addition to stamping the document once in a while, you should think about <\/span><b>further maintenance activities<\/b><span style=\"font-weight: 400;\"> - i.e. on how to maintain a signature <\/span><b>vibrant and important<\/b><span style=\"font-weight: 400;\"> despite the passage of time.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b8e84d5 elementor-widget elementor-widget-text-editor\" data-id=\"b8e84d5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Coming up in the next article: <\/span><a href=\"https:\/\/podpisano.pl\/en\/podpis-elektroniczny-na-lata-konserwacja-i-archiwizacja-dokumentow-w-praktyce\/\"><b><i>Electronic signature for years to come - document preservation and archiving in practice <\/i><\/b><\/a><i><span style=\"font-weight: 400;\">we will talk about what the maintenance of an electronic signature is and how to securely archive signed documents so that they remain valid for years to come.<\/span><\/i><span style=\"font-weight: 400;\"> We invite you to read the second part - because an e-signature, like a valuable painting, also requires proper care to keep it shining.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ef95c91 elementor-widget-divider--view-line_icon elementor-view-default elementor-widget-divider--element-align-center elementor-widget elementor-widget-divider\" data-id=\"ef95c91\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon elementor-divider__element\">\n\t\t\t\t\t<svg aria-hidden=\"true\" 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class=\"elementor-element elementor-element-fbcfbc7 elementor-widget elementor-widget-heading\" data-id=\"fbcfbc7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Call us at\n<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-faf3887 elementor-widget elementor-widget-heading\" data-id=\"faf3887\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\"><a href=\"tel:+48%2022%20417%2005%2055\"> +48 22 417 05 55\n<\/a><\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e6bd9dc elementor-widget elementor-widget-heading\" data-id=\"e6bd9dc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">and we will put you in touch with one of our representatives available virtually nationwide.<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>How to make sure an electronically signed document will be valid in 5 or 10 years? Learn about tools that protect digital content and the identity of the sender.<\/p>","protected":false},"author":322,"featured_media":7040,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[319],"tags":[328,331,330,296,290,301,329,304],"class_list":["post-7038","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cyberbezpieczenstwo","tag-cyberbezpieczenstwo-2","tag-cyfryzacja","tag-it","tag-podpis-elektroniczny","tag-podpis-kwalifikowany","tag-tozsamosc","tag-systemy-it","tag-zaufanie-cyfrowe"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.7 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Podpis, piecz\u0119\u0107 i znacznik czasu \u2013 jak dzia\u0142aj\u0105 us\u0142ugi zaufania cyfrowego? - Podpisano.pl<\/title>\n<meta name=\"description\" content=\"Sprawd\u017a, jak dzia\u0142a podpis kwalifikowany, piecz\u0119\u0107 i znacznik czasu. 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