Digital Signature in Cryptography for SignNow Workflows

Award-winning eSignature solution

What a digital signature in cryptography means

A digital signature in cryptography is a mathematical way to prove who signed a document and whether the document changed after signing. It uses a private key to create the signature and a public key to verify it. First, the document is hashed into a fixed-length digest. Then the signer’s private key signs that digest. When someone verifies the signature, the system checks the hash and confirms the signer’s identity and document integrity.

Why digital signatures matter in the U.S.

Digital signatures reduce manual handling, speed approvals, and create stronger evidence for signed records. Under ESIGN and UETA, they can be legally enforceable when intent, consent, and attribution are established, which makes them useful for business workflows that need both speed and defensibility.

Why teams look for DocuSign alternatives

Frequent implementation pain points

Signer identity can be disputed when authentication is weak or poorly documented.
Document changes after signing can break trust if tamper evidence is missing.
Retention gaps can make it harder to prove consent, timing, or approval history.
Poor key management can expose private keys and weaken signature integrity.

Healthcare

Healthcare teams use signed intake forms, consent records, and HIPAA-related authorizations.

Real estate

Real estate teams use leases, disclosures, and closing documents with ESIGN consent.

Users who benefit most

A director of NetSuite operations in manufacturing or distribution uses signNow to route approvals through connected systems, keep records aligned with ERP data, and reduce delays between internal teams and external counterparties.
A healthcare operations leader uses signNow to collect patient signatures on mobile devices, maintain HIPAA-oriented workflows, and keep signed forms organized for audit and retention needs.

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Identity binding

Creates a cryptographic link between the signer and the record, helping verify identity and detect post-signing changes.

Tamper evidence

Produces tamper-evident records that support stronger evidence in disputes and internal reviews.

Hash verification

Uses hash-based verification to confirm that the signed file matches the original content.

Audit trail

Supports audit-ready records with timestamps, signer details, and action history.

Cross-device signing

Works across desktop and mobile workflows, which helps teams sign without paper handling.

Compliance support

Fits regulated workflows that need ESIGN, UETA, HIPAA, or 21 CFR Part 11 alignment.

Connected systems and workflows

Connected systems move signed documents into the tools teams already use, reducing duplicate entry and keeping records aligned across departments.

How the cryptographic process works

The signing flow follows a clear sequence from document preparation to verification and record sealing.

Document received: The signer receives a document and reviews the content.
Hash created: The system hashes the file and creates a signature.
Signature verified: Verification checks the public key and document integrity.
Record sealed: The signed record is sealed with an audit history.

Quick signing workflow

Use a short workflow to prepare, send, and track a signed document from start to finish.

Upload file:
Upload the file you want signed.
Set recipients:
Add signers and assign the signing order.
Place fields:
Choose the signature fields and required inputs.
Send and monitor:
Send the document for signature and track status.

Setting	Recommendation
Authentication method	SMS OTP with ID verification
Signature type	Cryptographic digital signature
Audit trail	Full timestamped log
Document retention	6 years for HIPAA records
Encryption	TLS 1.2/1.3 and AES-256

Platform and device requirements

Use a modern browser or mobile device with secure transport and current operating system support for signing and verification.

Browser support Chrome, Firefox, Safari, and Edge support web signing.
Operating systems Windows, macOS, iOS, and Android are supported.
Security layer TLS 1.2 or TLS 1.3 required.

For enterprise deployments, managed devices, SSO provisioning, and API-based workflows help keep access controlled across departments. Regulated teams should also confirm retention, encryption, and authentication policies before rollout.

Security and compliance snapshot

Transport security:

Encrypts data in transit with TLS 1.2/1.3.

Data at rest:

Encrypts stored data with AES-256.

SOC 2 Type II:

Supports SOC 2 Type II controls.

ISO 27001:

Supports ISO 27001 certified practices.

HIPAA support:

Supports HIPAA workflows with BAA.

Global compliance:

Supports GDPR and eIDAS compliance.

Operations workflow

A NetSuite operations leader needed signatures tied to ERP records and document formats.

Xerox used signNow with NetSuite integration.

The workflow kept the right signatures on the right documents and reduced manual routing across systems.

Real estate execution

A founder in real estate needed mobile execution for leases and related forms.

Martin Properties cited 100% compliance and built-in security.

The process supported online completion, mobile signing, and secure record handling for property documents.

Best practices for secure signing

Good signing practices focus on identity, integrity, retention, and the level of assurance needed for the document type.

Verify signer identity

Use stronger authentication for sensitive agreements, and keep the signer identity method documented in the record history for later review.

Limit signing complexity

Keep the signing order and field placement simple so each signer sees only the actions they need to complete.

Preserve complete records

Retain signed files, timestamps, and audit logs together so the record stays usable for ESIGN, UETA, and HIPAA reviews.

Match assurance to risk

Match the signature method to the document risk, using higher assurance for regulated, financial, or high-value transactions.

Day 0:

Set up the account and confirm authentication rules.

Day 1:

Send the first document for signature.

Week 1:

Onboard the team and review audit trail use.

HIPAA retention:

Keep signed records 6 years per 45 CFR 164.530(j)(2).

Free trial:

7-day free trial, no credit card required.

Business plan:

$8/user/month, billed annually.

Enterprise rollout:

Use advanced signer authentication and integrations.

Site License:

$1.50/signature invite for 1000+ docs/year.

Risks of poor implementation

Weak attribution

Document may be harder to enforce.

Missing logs

Audit evidence may be incomplete.

Tamper risk

Signed record may be challenged.

Retention gap

HIPAA review may fail.

Signer authentication:

Confirms the signer through account and session data.

Timestamp capture:

Records the signing time in a secure log.

Document hashing:

Creates a hash of the signed document.

Tamper-evident sealing:

Locks the record against later changes.

Audit history:

Stores the event history with the file.

Trail export:

Exports the trail for review or evidence.

signNow	DocuSign	Adobe Acrobat Sign	PandaDoc
Audit trail	Yes	Yes	Yes
HIPAA support	Yes	Yes	Yes
Bulk send	No	Yes	Yes
Envelope cap	No cap	100/yr	Not verified

	signNow	DocuSign	Adobe Sign	PandaDoc	Dropbox Sign
Starting price	$8/user/mo	$15/user/mo	$14/user/mo	$19/user/mo	$15/user/mo
Free trial	7 days	Not verified	Not verified	Not verified	Not verified
Bulk send	Yes, Business Premium	Not verified	Not verified	Not verified	Not verified
Audit trail	Yes	Yes	Yes	Yes	Yes
HIPAA compliance	BAA required	BAA available	BAA available	Not verified	Not verified

FAQ and troubleshooting

These answers focus on plan limits, compliance requirements, and the records needed to support defensible signing workflows.

signNow Business includes audit trails, templates, and mobile apps, while Enterprise adds advanced signer authentication. HIPAA use requires a BAA, and 21 CFR Part 11 workflows need timestamps and document history retention.

If a HIPAA document is involved, confirm the account has a signed BAA and that access controls, audit logs, and encryption are enabled. signNow supports HIPAA workflows when the BAA is in place.

For 21 CFR Part 11 records, use unique user identification, secure timestamps, and retained document history. signNow’s compliance controls support these requirements, but the regulated process still needs validation by the organization.

If a signer cannot complete the flow on mobile, confirm browser support or use the signNow iOS or Android app. Mobile-created eSignatures remain valid under ESIGN and UETA when intent and attribution are clear.

If a document needs stronger evidence, use the audit trail to review signer identity, timestamps, and action history. That record supports attribution under ESIGN and UETA and helps with disputes.

For higher assurance workflows, use advanced signer authentication in Enterprise or a Site License with SSO and API access. The right plan depends on the document risk and compliance needs.

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