Accountants and auditors
Applies to: Netherlands
Encrypted file exchange for accountancy and audit firms
Request documents from clients through an upload box and deliver financial statements and reports in encrypted form, with proof of delivery.
- Developed & operated in Germany
- End-to-end encrypted
- Professional secrecy in our contract
- Signed proofs of delivery
What your professional rules require
Confidentiality is a fundamental principle. Confidential data and information must be kept secret, except in the cases listed in Art. 16.
You take reasonable measures to ensure that those working under your responsibility, and those you ask for advice or support, also comply with the confidentiality obligations.
How TEPHIA SECURE meets them
Contractual confidentiality and supervisory access
In clause 5b, our data processing agreement commits us to confidentiality, binds everyone involved in writing and gives your supervisory authority information and access to records where the rules that apply to you require it. You conclude it electronically and receive a copy as a PDF.
State of the art
AES-256-GCM encryption in the sender’s browser, with the key derived from the password using Argon2id. The server holds no key and cannot read the contents.
No account needed for recipients
Recipients do not need an account. Clients and third parties can send you documents through an upload box, with the same protection and the same proof of delivery.
Verifiable proof of delivery
Each entry is cryptographically chained to the previous one. The proof of delivery is a signed PDF/A with a timestamp from an independent time-stamping authority.
How your proofs are secured
| In every planSignature with our certificate | Add-on · coming soonQualified electronic seal | |
|---|---|---|
| Any change to the PDF invalidates the signature | included | included |
| Timestamp from an independent authority | included | included |
| Hash chain with daily chain seal | included | included |
| Checksum (SHA-256) of every file, confirmed by the recipient | included | included |
| Verifiable online, without an account | included | included |
| Display in Adobe Reader | “Validity unknown”1 | Valid |
| Legal presumption of authenticity (Art. 35(2) eIDAS) | not included | included |
| Useful for | Your records, clients | Courts, authorities, the other party |
1 Not an error: our certificate is not on the EU trust list that Reader recognises. You can check integrity online or using the certificate fingerprint.
- Signature: any change is detected
- Timestamp from an independent authority
- Hash chain with daily chain seal
- Checksum of every file, confirmed by the recipient
- Verifiable online, without an account
- Adobe Reader shows “Valid” instead of “Validity unknown”
- Legal presumption of authenticity (Art. 35(2) eIDAS)
- Useful for courts, authorities, the other party
There is no certification of services like this by a professional body, and carefully selecting a service provider remains your responsibility under your professional rules.
The information on the legal position on this page is general information, without any warranty as to completeness or currency, and does not constitute legal advice. Only our contracts are binding.