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All tools / CryptoSign
CryptoSignSigning
Prove it comes from you, without a signing platform.
Create your keys in one click, sign a document or a text, and let your clients verify it with your public key. Everything happens in your browser.
Ed25519or ECDSA P-256 as a fallback
AES-GCMpassword-encrypted private key
0accounts, 0 servers
2languages, EN and FR
Features
Create, sign, verify.
01
Create your keys
A key pair generated on your machine; the private key is encrypted with your password (PBKDF2 + AES-GCM).
02
Sign
A file or a text (message, contract, e-mail): you get a JSON signature to attach.
03
Verify
With the author's public key: valid and authentic, valid but not authenticated, or invalid if the content changed.
What you get
One file, two languages.
- cryptosign.zip: the page in English and French, a read-me and the licence.
- Opens in any recent browser, even offline.
- No account, no installation, no data sent.
- The version you buy and fixes to its bugs.
What it does not do
Honest limits.
- It is not a qualified electronic signature under eIDAS.
- Forgotten password: the private key is unusable and cannot be recovered. Back it up offline.
- Ed25519 and ECDSA do not resist a quantum computer; the signing date comes from your clock.
FAQ
Frequently asked questions
Does my private key leave my computer?
No. It is created and used in your browser, encrypted with your password, and the page forbids any connection.
How do I prove the public key is mine?
Hand it over through a safe channel: in person, on your website, by phone. Without a trusted key, the tool shows “not authenticated”.
When can I buy it?
Soon. Sign up below: one single message when sales open.
Waiting list
Get notified at launch.
Leave your e-mail and the tool you are interested in. One message when sales open, nothing else.
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