Digital Signature Algorithms in Cryptography for SignNow
Award-winning eSignature solution
What digital signatures do
Digital signature algorithms in cryptography use a public and private key pair to prove who signed a document and to detect later changes. The signer hashes the document, creates a signature with the private key, and the recipient verifies it with the public key. In U.S. business use, this supports authenticity, integrity, and evidence of intent under ESIGN and UETA, while helping teams replace paper routing with controlled digital workflows and audit-ready records.
Why digital signatures matter
Digital signature algorithms in cryptography help U.S. businesses prove authenticity, protect record integrity, and reduce manual handling. Under ESIGN and UETA, properly executed electronic signatures can carry legal effect, while SignNow adds audit trails, authentication controls, and retention features that support enforceable digital transactions.
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Key capabilities for secure signing
SignNow combines signing, tracking, and access controls so teams can complete high-trust document workflows without adding unnecessary complexity.
Flexible signing
Signers can complete documents on desktop or mobile while keeping a consistent record of identity checks, timestamps, and document history for later review.
Reusable templates
Templates reduce repeated setup work, keep fields consistent, and help teams send contracts, forms, and approvals with fewer manual adjustments.
Audit trail
Audit trails capture signer activity, timestamps, and document events, which supports internal review and dispute response when records need to be checked.
Signer authentication
Authentication options such as SMS OTP and ID verification add stronger identity checks for higher-risk documents and regulated workflows.
Record control
Retention and export controls help teams keep signed records organized, searchable, and available for policy, legal, or compliance review.
Cross-device access
Mobile and browser access let legal, healthcare, finance, and construction teams complete signing without requiring a paper process.
Certificates and signer authentication
PKI:
X.509 certificates:
Two-factor authentication:
SMS OTP:
ID verification:
Signer trust:
How the signing process works
This flow shows how a document moves from preparation to a signed record with traceable identity and document history.
Prepare: The sender prepares a document and places fields for signatures, dates, or initials before routing it for review. Deliver: SignNow delivers the request through email or a signing link, and the recipient opens it on any supported device. Sign: The signer reviews the document, completes the required fields, and confirms intent with the selected authentication method. Complete: SignNow seals the record with an audit trail, stores the signed file, and keeps it ready for export or retention.
Signing methods for every workflow
- Send documents from the web app when you need desktop review, template reuse, and controlled routing for office-based signing or internal approvals.
- Use the mobile app when signers need to review and sign on iOS or Android without waiting for a desktop computer.
- Choose kiosk mode on shared devices for in-person intake, front-desk signings, or on-site workflows where each signer uses the same station.
- Share signing links when recipients should open a document directly from email or chat and complete it without a managed workspace.
Recommended workflow settings
Set authentication, logging, retention, and encryption to match the document’s risk level and governing compliance rule.
| Setting | Recommendation |
|---|---|
| Authentication method | SMS OTP for higher assurance |
| Signature type | SES for routine forms |
| Audit trail | Enable full event logging |
| Document retention | 6 years for PHI records |
| Encryption | TLS 1.2/1.3 and AES-256 |
FAQs and troubleshooting
These answers focus on signing issues, compliance needs, and plan differences that matter when teams use SignNow for regulated documents.
If a signer cannot open the document, check the email delivery, signing link, and browser support. SignNow works across desktop and mobile, and the audit trail shows delivery and access events for review.
If HIPAA records are involved, use a SignNow plan with BAA support and keep signed documents for 6 years under 45 CFR 164.530(j)(2). The audit history helps confirm access and integrity.
If a signer needs stronger identity proof, use SMS OTP or ID verification. For higher-risk workflows, stronger authentication provides better attribution than simple email-based access and supports a more defensible record.
If you need more control over team use, the Business, Business Premium, Enterprise, and Site License plans include different levels of access, APIs, and add-ons. Review the plan before enabling delegated sending or advanced authentication.
If a document must remain verifiable later, export the completed file and audit trail and store it in secure archival storage. SignNow records timestamps, signer activity, and document history for retention review.
If the document is a will, certain court order, or another excluded record type, use the applicable state or federal process instead of e-signing. ESIGN and UETA do not remove those exceptions.
Record-keeping practices that reduce risk
Retention and archive controls matter as much as the signature itself when records may be reviewed later in court or during compliance checks.
Match retention to the rule
Export audit trails regularly
Use secure archival storage
Align controls with risk
Platform support and device access
SignNow works in current desktop browsers and on mobile devices, letting users sign in supported environments without changing the document’s legal character.
Browser support Chrome, Firefox, Safari, and Edge support signing in modern browsers. Operating systems Windows and macOS work for desktop workflows; iOS and Android support mobile signing. Secure connection TLS 1.2 or higher is required for secure connections.
Teams that use managed devices, API access, or SSO should confirm browser policy, mobile access, and retention settings before rollout. Regulated workflows also need certificate handling, access control, and export options that match internal policy and the applicable rule set.
Key performance indicators that demonstrate SignNow's proven track record.