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PSS testingVerify a document

Check that a document is genuine

Upload a PDF issued by the Michele Solutions PSS Lab and see whether it is authentic and unchanged.

Documents issued by our PSS laboratory carry a digital signature. This page checks that signature for you.

Three steps

  1. Find the PDF you received from us.
  2. Upload it in the box on this page.
  3. Read the result: authentic and unchanged, or not.

What the result means

A positive result means the file is exactly the one we signed. If even one byte was changed, the check fails. If it fails, do not rely on the document and contact us.

For IT and quality teams who want to check on their own.

Technical details

  1. Signature: PAdES baseline-B, RSA-2048 with SHA-256 (PKCS#1 v1.5), embedded in the PDF.
  2. Timestamp: an RFC 3161 timestamp from a third-party authority, when it was reachable at signing.
  3. Coverage: the whole file. Any change, even one byte, invalidates the signature.
  4. Other ways to verify: in Adobe Acrobat or any reader that supports PAdES, or offline with our X.509 certificate or public key and pyHanko.

Trust anchor

Our signing certificate is self-signed, so it is not vouched for by a public authority. Public key fingerprint (SHA-256, first 16 hex characters): 10a62472a9f15d9a. Download the public key and compute the same value to check that you hold the key we use. The certificate and the public key are available for download.

Contact us

Tell us what you need. We read every message and reply in English, 한국어, Italiano, 日本語, Русский.

What can we help with?
Consents
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Controller: Michele Solutions Co., Ltd. / Purpose: to receive and answer your enquiry / Items: name, email, message (required); company, phone (optional) / Retention: 12 months after our last contact / You have the right to refuse; the form then cannot be sent.

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Items: as above / Countries: Singapore (where the server is), Canada (where the recipient is established and where backup copies of the server are kept), and, for our email correspondence with you, Singapore (contracting company) and the countries where Google's data centers are, including the United States / When and how: sent over an encrypted connection when you send the form and stored on a server in Singapore; our replies are sent by encrypted email and stored in our mailbox / Recipients: Hebergement OVH Inc. (OVHcloud), 800-1801 Avenue McGill College, Montreal, QC H3A 2N4, Canada; Google Asia Pacific Pte. Ltd. (Google Workspace), 70 Pasir Panjang Road, #03-71, Mapletree Business City, Singapore 117371 / Purpose and retention: as above / You have the right to refuse; the form then cannot be sent.

How we handle your data: privacy policy