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HASH Signing
What is Hash Signing?
Hash Signing is a privacy-first digital signature method where only a cryptographic fingerprint (SHA-256 hash) of a document is sent for signing, not the full file itself.
Instead of transferring the entire document to eID Easy, your system generates the hash and sends only that hash to be signed.
The signed hash is then embedded back into the document within your own environment, producing a fully valid signed file while keeping the original content private.
This approach delivers the same legal strength as traditional full-file signing but keeps all document data securely inside your infrastructure.
“The partnership with eID Easy offers our clients a swift and easy solution to extend their services across the European continent. Everything needed is combined in one API, eliminating the need for multiple local integrations. This leads to lower costs and faster delivery.”
Who is it for?
For Large, Sensitive, or Regulated Documents
Organizations that need to sign very large or highly confidential documents without sending full files outside their environment can benefit from Hash Signing. It is especially valuable for batch signing, where transferring hundreds or thousands of large files would be slow and costly, and for sectors that must keep sensitive data private.
- Legal & finance for confidential contracts and records
- Blockchain & tech for verifiable proofs without full data transfer
- Healthcare & defense for private or classified data
- Engineering & construction for huge technical files
In mixed workflows, it is even possible to combine hash and full-file signing within the same batch: one signer may use hash signing while another requires full-file signing, for example when an Italian signer can remain on hash but an Indian signer must follow local rules that require the full document to be processed on servers located in India.
How does it work
Sign the Fingerprint, Keep the File Private
Hash Signing follows the same cryptographic principles as full-file signing, with a privacy-focused twist:
- Document Display & Hashing – Your system shows the document to the signer (meeting What You See Is What You Sign requirements) and generates a SHA-256 hash.
- Hash Transmission – Only the hash is sent to eID Easy, never the full file.
- Signature Creation – eID Easy signs the hash with the chosen provider.
- Signature Injection – Your system embeds the signed hash back into the document to create the final, fully signed file.
eID Easy provides optional utilities (e.g., a secure Docker/Java service) to help you calculate and insert the hash if needed.
Maximum Privacy
The document never leaves your infrastructure—ideal for sensitive data and strict compliance environments.
Handles Huge Files Effortlessly
Sign gigabyte-sized plans, images, or technical documents without slow transfers.
Equal Security and Compliance
Hash signatures are just as legally binding and tamper-proof as full-file signatures, supporting both Advanced and Qualified signature levels.
Perfect for High-Volume Batches
Especially effective for batch signing, where moving large numbers of files would otherwise strain bandwidth and processing.
Why choose eID Easy for Hash Signatures?
eID Easy offers a multi-vendor, flexible approach that supports both Advanced and Qualified signature levels across many trusted providers. We provide ready-made tools and libraries to calculate hashes and embed signed hashes back into documents, along with expert guidance for complex integrations or mixed workflows where hash signing and full-file signing need to work side by side to meet regional regulations.
With eID Easy, you gain all the speed, security, and privacy of hash signing without compromising on compliance or ease of integration.
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