Asymmetric Encryption Digital Signature for SignNow
Award-winning eSignature solution
What an asymmetric encryption digital signature is
An asymmetric encryption digital signature is a cryptographic signature that uses a private key to sign a document and a public key to verify it. In practice, the signer creates a hash of the document, encrypts that hash with the private key, and attaches the result as the signature. Anyone with the public key can confirm the signer’s identity and detect any later changes. In the U.S., this supports secure, attributable electronic signing for business records, contracts, and regulated workflows.
Why it matters for U.S. signing
It helps prove who signed, preserves document integrity, and supports enforceability under ESIGN and UETA when consent, intent, and record retention are handled correctly. For businesses, that means faster approvals, fewer disputes, and a clearer evidentiary record.
Common implementation challenges
Key management mistakes can prevent verification or expose private keys if access controls are weak. Poor signer authentication can weaken attribution when a document is challenged in court or audit. Missing timestamps, hashes, or audit details can make it harder to prove document integrity. Using the wrong signature tier for regulated workflows can create compliance gaps in healthcare or finance.
Who uses it and where
Business documents
Used for contracts, approvals, disclosures, and records that need secure attribution and tamper evidence.
Regulated workflows
Used for patient forms, loan files, and regulated records that require auditability and retention.
People who benefit most
A director of NetSuite operations at Xerox uses signNow to route signatures through integrated workflows, keeping the right documents in the right format while preserving traceability across systems and approvals. A CEO at Tech Data uses signNow to speed internal and external service processes, where secure signing, clear audit trails, and fast turnaround matter across high-volume business documents.
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Key features and benefits
signNow supports secure signing workflows with cryptographic verification, auditability, and controls that fit U.S. business and regulated document needs.
Private-key signing
Private-key signing creates a signature that is tied to one signer and one document state, which helps support non-repudiation and tamper detection.
Public verification
Public-key verification lets recipients confirm authenticity without sharing the private key, which keeps verification simple across internal and external review.
Integrity checks
Hash-based integrity checks reveal document changes after signing, helping teams detect edits, replacements, or transmission errors quickly.
Audit records
Audit-ready records capture signer activity, timestamps, and document events, which supports legal review and internal controls.
Access control
Controlled access reduces the risk of unauthorized signing by limiting who can send, sign, or manage documents.
Compliance support
Regulated workflow support helps teams align signing processes with ESIGN, UETA, HIPAA, and 21 CFR Part 11 needs.
How the signature process works
The process follows a short cryptographic chain from document hashing to verification, with each step preserving identity and integrity evidence.
Hash and sign: The signer creates a private-key signature for the document hash. Verify with public key: The recipient uses the public key to verify authenticity. Check integrity: Any document change breaks the hash comparison and flags tampering. Record evidence: The system stores timestamps and event data for later review.
Quick signing steps
Use a short workflow to prepare, send, sign, and store documents with a clear record of each action.
Prepare the file:
Upload the document and choose the signing order. Set recipients:
Add signers and assign the required fields. Send for signing:
Send the document for signature and review. Archive the file:
Download the completed record and store it securely.
Recommended workflow setup
A secure setup pairs stronger signer verification with retention, encryption, and access controls that match the document’s legal and operational risk.
| Setting | Recommendation |
|---|---|
| Authentication method | SMS OTP with ID verification |
| Signature type | Advanced electronic signature |
| Audit trail | Timestamped, tamper-evident log |
| Document retention | 6 years for HIPAA records |
| Encryption | TLS 1.2/1.3 in transit, AES-256 at rest |
Platform and device requirements
Use a modern browser and current operating system to sign, review, and manage documents securely across desktop and mobile devices.
Desktop browsers Chrome, Firefox, Safari, and Edge Operating systems Windows 11, macOS, iOS, and Android Connection security TLS 1.2 or TLS 1.3
For regulated deployments, managed devices, SSO, and API-based provisioning help standardize access across teams. Mobile signing works on iOS and Android, while desktop access is supported in Chrome, Firefox, Safari, and Edge.
Security and compliance controls
Transport encryption:
Storage encryption:
Security report:
Information security:
Healthcare compliance:
Legal framework:
Real-world use cases
Customer stories show how secure signing supports operational speed, traceability, and document control in real business settings.
Enterprise operations
A Xerox operations leader needed flexible routing across systems and document formats.
- NetSuite integration kept signature routing aligned with business records.
The workflow reduced format friction and kept approvals tied to the right records, which supported faster processing and clearer document control across integrated systems.
Revenue operations
A Tech Data executive needed faster internal and external service handling.
- signNow improved speed to revenue while preserving secure signing records.
The team used secure signing to shorten turnaround without losing traceability, which helped improve customer service and keep document handling consistent across departments.
Best practices for secure signing
A careful setup reduces disputes, supports compliance, and keeps the signing record usable long after the document is completed.
Match verification to risk
Restrict signing access
Preserve audit evidence
Define retention rules
Rollout and retention timeline
This timeline combines rollout milestones with retention and policy facts that affect secure signing programs in the U.S.
Day 0:
Day 1:
Week 1:
7-day trial:
HIPAA retention:
ESIGN consent:
21 CFR Part 11:
UETA coverage:
Risks of poor implementation
Weak attribution
Incomplete logs
Missing BAA
Hash mismatch
What the audit trail records
The audit trail captures technical evidence that shows who acted, when they acted, and whether the record stayed intact.
Signer authentication:
Timestamp capture:
Document hashing:
Tamper-evident sealing:
Audit record storage:
Trail export:
Pricing and plan features
Pricing reflects verified entry-tier annual billing data and plan features available from the provided ground truth.
| signNow | DocuSign | Adobe Sign | PandaDoc | HelloSign | |
|---|---|---|---|---|---|
| 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 | Yes | Not verified |
| Audit trail | Included | Included | Included | Included | Included |
| HIPAA compliance | BAA required | BAA available | BAA available | Not verified | Not verified |
Vendor comparison at a glance
The table compares core signing and compliance capabilities across leading vendors using verified baseline information.
| signNow | DocuSign | Adobe Sign | PandaDoc |
|---|---|---|---|
| ESIGN and UETA | Yes | Yes | Yes |
| Audit trail | Yes | Yes | Yes |
| HIPAA support | Yes | Yes | Yes |
| Starting price | $8/user/mo | $15/user/mo | $14/user/mo |
| Envelope cap | No cap | 100 envelopes/year | Not verified |
FAQ and troubleshooting
These answers focus on signNow features, plan differences, and U.S. compliance requirements that affect secure signing workflows.
signNow Business includes legally binding eSignatures, audit trails, templates, and mobile apps. For HIPAA workflows, use a BAA and keep signed records for 6 years under 45 CFR 164.530(j)(2).
The Business Premium plan adds bulk send, which helps when one document must go to many recipients. If you need advanced signer authentication or enterprise controls, the Enterprise plan adds more options.
HIPAA support requires a BAA, unique user identification, access controls, and audit controls. signNow’s compliance posture supports those requirements, but the covered entity still has to configure the workflow correctly.
ESIGN and UETA support enforceability when the signer’s intent, consent, and attribution are captured. A clear audit trail, timestamped events, and completed record retention help support evidence in a dispute.
For 21 CFR Part 11 workflows, use validated processes, secure audit trails, and unique signer credentials. Part 11 also requires system controls that preserve record integrity and signature meaning.
If a signer cannot verify a document, check the public key chain, certificate status, and document hash. A mismatch usually means the file changed after signing or the certificate is no longer trusted.
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