Digital Signature Security — How to Ensure Your Documents Are Protected

Why Is Security Important in Digital Signatures?

When we sign a digital document — whether a business contract, lease agreement, or HR document — we trust the system to protect the document from unauthorized changes, verify the signers' identities, and maintain data privacy.

Good security is not just a technical matter — it is also a legal one. The Israeli Electronic Signature Law requires a secure electronic signature to meet certain standards, including unique signer identification and the ability to detect changes to the document. A platform that does not meet these standards does not provide real legal protection.

Security Layers in Digital Signatures

1. Document Encryption

The foundation of every secure digital signature system is encryption. SignFlow uses AES-256 encryption — the same level used by banks and security institutions. Every document is encrypted both in transit and at rest.

The encryption ensures that even if someone intercepts the document, they cannot read or alter it without the appropriate keys. All communication takes place over a secure TLS 1.3 connection.

2. Audit Trail — Tracking and Documentation

An audit trail is a detailed record of every action performed on the document. In SignFlow, the audit trail includes:

• Precise timestamps: A timestamp for every action — creation, sending, opening, signing.
• IP addresses: The IP address of every user in every action.
• Device information: Browser type and operating system.
• Identity verifications: Documentation of every verification check performed.
• Status changes: Tracking every change in document status.

The audit trail is immutable and serves as strong legal evidence in court.

3. Identity Verification

Identity verification confirms that the person signing is really who they claim to be. SignFlow offers several verification levels:

• Email verification: A unique link is sent to the signer's email — only those with access to the email can sign.
• SMS verification: A one-time code is sent to the mobile phone.
• Two-factor authentication: Combination of email + SMS or email + password.
• Access code: A secret code shared between sender and signer.

You can choose the appropriate verification level for each document — a simple document requires basic verification, while a complex contract requires advanced verification.

4. Tamper Evidence

Once a document is signed, it is "locked" — any change to the document will trigger an alert. The technology works like this: the system creates a hash (digital fingerprint) of the document at the moment of signing. If even one character changes, the hash changes — and the system detects the change immediately.

5. Secure Backup and Storage

All documents in SignFlow are automatically backed up on secure servers. Data is stored with full encryption and daily backups, so even in the event of a technical failure — your documents are safe.

GDPR and Data Privacy

SignFlow complies with GDPR regulations and the Israeli Privacy Protection Law. This includes:

• Data minimization: Only the data necessary for the signing process is collected.
• Right to deletion: Users can request deletion of personal data.
• Transparency: A clear privacy policy detailing how data is used.
• Access controls: Only authorized users can access documents.
• Storage in Israel: Option to store data on servers in Israel.

What to Look for in a Digital Signature Service?

When choosing a digital signature service, check these security layers:

1. Encryption: Make sure the service uses strong encryption (at least AES-256).
2. Audit trail: Check that there is detailed documentation of every action.
3. Identity verification: Make sure there are advanced verification options.
4. Legal compliance: Check that the service meets Israeli law.
5. Backup: Make sure there is automatic backup of all documents.
6. GDPR: Check compliance with data privacy regulations.

SignFlow meets all of these criteria and more. Visit our security page for more details, or our features page for a full list.

Frequently Asked Questions