Public Key Encryption Vs Digital Signature for signNow
Award-winning eSignature solution
What public key encryption and digital signatures do
Public key encryption uses a public key to lock data and a private key to unlock it, so only the intended recipient can read the message. A digital signature uses the signer’s private key to create a unique code from the document, and anyone with the public key can verify it. In U.S. eSignature workflows, encryption protects confidentiality, while digital signatures protect integrity, identity, and non-repudiation. Together, they support secure document exchange and reliable electronic records.
Why the distinction matters
The difference matters because encryption keeps information private, while a digital signature helps prove who signed and whether the record changed. Under ESIGN and UETA, that evidence can support enforceability, reduce disputes, and help businesses move contracts, approvals, and regulated records through digital workflows.
Common implementation pitfalls
Confusing encryption with signing can leave teams protecting confidentiality but failing to prove signer intent or document integrity. Weak authentication methods can make it harder to attribute a signature to the right person in a dispute. Poor key management can block verification later if certificates expire, are revoked, or are not archived correctly. Missing audit details can weaken evidence for ESIGN, UETA, HIPAA, or 21 CFR Part 11 reviews.
Who uses these controls
Sensitive records
Organizations that exchange sensitive records use encryption for privacy and digital signatures for legal proof, especially when documents move across departments or outside counsel.
Contract workflows
Teams handling contracts, approvals, and regulated forms use signed records to support ESIGN, UETA, HIPAA, and audit-ready workflows.
People who benefit most
A director of NetSuite operations at a distribution company may need signed purchase orders, approval logs, and controlled access to records that move between ERP and contract workflows. signNow customer stories show this kind of role using integrations to route the right signatures to the right documents in the right format. A founder at a healthcare or real estate business may need mobile signing, audit trails, and secure handling of sensitive forms. signNow customer stories from Fertility Centers of Illinois and Martin Properties fit this pattern, where compliance, speed, and document integrity matter together.
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Core features and benefits
Public key encryption and digital signatures solve different problems, but both support secure, defensible electronic workflows when used correctly.
Confidentiality
Protects document privacy while keeping the content unreadable to anyone without the private key.
Signer proof
Creates a verifiable link between the signer and the signed record for later review.
Tamper evidence
Detects post-signing changes by breaking verification if the document is altered.
Evidentiary support
Supports court-ready records when paired with a clear audit trail and authentication history.
Cross-industry use
Works across contract, healthcare, finance, and government workflows that need secure digital records.
Flexible deployment
Fits mobile and desktop signing flows without changing the legal effect of the signature.
How the process works
The workflow is sequential: protect the file, sign it, verify it, and preserve the evidence.
Prepare: A sender prepares the document and chooses the protection method. Protect: The system encrypts content or creates the signature hash. Verify: The recipient verifies identity and checks document integrity. Store: The record is stored with its audit history intact.
Quick setup steps
Use a simple sequence to match the signing method to the document’s legal and security needs.
Set the goal:
Choose whether the file needs privacy, proof, or both. Add the file:
Upload the document into signNow and assign recipients. Pick authentication:
Apply authentication that matches the transaction risk. Complete the workflow:
Send, sign, and store the completed record.
Recommended workflow settings
Use stronger identity checks for regulated records, and keep retention aligned with the governing rule set.
| Setting | Recommendation |
|---|---|
| Authentication method | SMS OTP with ID verification |
| Signature type | Advanced electronic signature |
| Audit trail | Enable full event logging |
| Document retention | 6 years for HIPAA records |
| Encryption | TLS 1.2/1.3 and AES-256 |
Platform and device requirements
signNow works in current desktop browsers and mobile apps, with secure connections required for document access and signing.
Desktop browsers Chrome, Firefox, Safari, and Edge on Windows and macOS. Mobile support iOS and Android mobile apps for signing on the go. Connection security TLS 1.2 or later, with current browser updates.
For enterprise or regulated use, managed devices, SSO, API access, and retention controls help keep signing workflows consistent across teams. Browser updates, mobile app versions, and certificate handling should stay current so verification, audit trails, and record access remain reliable across Windows, macOS, iOS, and Android.
Security and compliance snapshot
Transport security:
Storage encryption:
Independent controls:
Security management:
Healthcare readiness:
Legal framework:
Real-world use cases
Customer stories show how secure signing, integrations, and audit trails fit operational work in finance, healthcare, and property-related workflows.
NetSuite operations
A NetSuite operations leader needed signatures tied to the right records across systems.
- Kodi-Marie Evans at Xerox used signNow with NetSuite.
- Right signatures reached the right documents.
The workflow reduced routing errors and kept signed records aligned with ERP-driven processes, which matters when approvals must match document type, format, and business rule.
Healthcare and property
A healthcare or property team needed secure, mobile-friendly signing with audit-ready records.
- Tim Martin at Martin Properties cited 100% compliance and built-in security.
- John Butler at Fertility Centers of Illinois highlighted the API experience.
The result was faster document turnaround with stronger recordkeeping, which supports regulated workflows where identity, intent, and document history all matter.
Best practices for secure signing
Good practice starts with matching the cryptographic method, identity check, and recordkeeping rule to the document’s legal purpose.
Separate privacy from proof
Match authentication to risk
Keep evidence complete
Review connected systems
Troubleshooting and FAQs
These answers focus on plan limits, compliance needs, and evidence questions that come up in secure eSignature workflows.
signNow Business includes legally binding eSignatures, audit trails, templates, and mobile apps. If you need higher assurance, Enterprise adds advanced signer authentication, while Site License adds SSO, full API access, and HIPAA or 21 CFR Part 11 add-ons.
signNow supports ESIGN and UETA compliant workflows, and the platform also lists HIPAA support with a BAA requirement. For healthcare records, keep the signed document, audit trail, and retention period aligned with 45 CFR §164.530(j)(2).
A digital signature verifies integrity and signer identity, but it does not replace encryption for confidentiality. Use TLS 1.2/1.3 in transit and AES-256 at rest, then keep the signature and audit trail for evidence.
If a signature is disputed, the audit trail should show signer identity, timestamps, and document history. signNow’s audit trail and document history help support attribution under ESIGN, UETA, and FRE Rule 901 evidence standards.
For FDA-regulated records, 21 CFR Part 11 requires unique user identification, secure audit trails, and validated systems. signNow can support controlled electronic workflows, but the regulated process still needs your validation and access-control procedures.
signNow’s pricing starts at $8/user/mo for the Business plan on annual billing, with a 7-day free trial. If you need bulk send, Business Premium includes it, and Enterprise adds advanced integrations.
Vendor comparison at a glance
The table compares core signing and pricing details across leading vendors using verified baseline data where available.
| signNow | DocuSign | Adobe Sign | PandaDoc |
|---|---|---|---|
| ESIGN and UETA | Yes | Yes | Yes |
| Audit trail | Yes | Yes | Yes |
| Starting price | $8/user/mo | $15/user/mo | $14/user/mo |
| Free trial | 7-day trial | Not verified | Not verified |
| Envelope cap | No cap | 100 envelopes/year | Not verified |
Rollout and retention timeline
This timeline combines adoption steps with retention and policy facts that affect secure signing programs.
Day 1:
Day 2:
Week 1:
7-day trial:
HIPAA retention:
21 CFR Part 11:
ESIGN and UETA:
Enterprise rollout:
Risks of poor implementation
Weak attribution
Integrity gap
Missing audit trail
Validation failure
What the audit trail records
The audit trail captures identity, timing, and integrity details that support later review of the signed record.
Signer authentication:
Timestamp capture:
Document hashing:
Tamper-evident sealing:
Audit trail storage:
Audit-trail export:
Pricing and plan features
Verified pricing and plan notes help compare entry-level options without guessing at unpublished enterprise terms.
| signNow | DocuSign | Adobe Sign | PandaDoc | HelloSign | |
|---|---|---|---|---|---|
| Starting price | $8/user/mo, annual | $15/user/mo, annual | $14/user/mo, annual | $19/user/mo, annual | $15/user/mo, annual |
| Free trial | 7 days | Not verified | Not verified | Not verified | Not verified |
| Bulk send | Business Premium | Not verified | Not verified | Not verified | Not verified |
| Audit trail | Included | Included | Included | Included | Included |
| Envelope cap | No cap | 100/user/year | Not verified | Not verified | Not verified |
Key performance indicators that demonstrate SignNow's proven track record.