Digital Signature With RSA Algorithm for signNow

Award-winning eSignature solution

What a digital signature with RSA algorithm is

A digital signature with RSA algorithm is a cryptographic way to sign an electronic document so the signer can be identified and the file’s integrity can be checked. It works by creating a hash of the document, then using the signer’s private RSA key to sign that hash. Anyone with the public key can verify the signature by comparing the decrypted hash with a fresh hash of the document. In U.S. workflows, this helps prove who signed, when they signed, and whether the record changed afterward.

Why RSA signatures matter

A digital signature with RSA algorithm helps reduce paper handling, speed approvals, and preserve evidence of intent. Under ESIGN and UETA, it can support enforceable electronic records when attribution, consent, and record retention are handled properly.

Why teams look for DocuSign alternatives

Common RSA signature issues

Private key protection is critical; weak storage can expose signing authority and undermine trust in the signature.
Certificate expiration or revocation can break verification if the workflow does not check status before acceptance.
Poor audit logging makes it harder to prove signer intent, timing, and document integrity in a dispute.
Legacy systems may not support modern hash algorithms, key sizes, or certificate validation requirements.

Legal teams

Legal teams use RSA-based signatures for contracts, amendments, and approvals that need clear attribution.

Regulated operations

Healthcare and finance teams use them for consent forms, disclosures, and regulated records.

People who benefit most

Operations leaders at real estate firms use signNow to route leases, addenda, and tenant forms with clear signer attribution and fast turnaround across mobile and office workflows.
NetSuite-focused operations managers at manufacturers and distributors use signNow to keep approvals aligned with ERP records, as shown in Xerox customer feedback about right signatures in the right formats.

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Cryptographic proof

RSA-based signing creates a verifiable link between the signer, the document hash, and the final record, which helps preserve integrity during review or later dispute resolution.

Audit evidence

Audit trails capture signer identity, timestamps, and document events, giving teams a clearer record of who acted and when the document changed.

Key control

Private key control keeps the signing action tied to the signer’s credentials, which supports non-repudiation and controlled access.

Tamper detection

Hash verification detects any post-signing edits, so even small changes become visible during validation.

Flexible signing

Browser and mobile signing keep approvals moving without paper handling, which shortens cycle time for distributed teams.

Legal alignment

ESIGN and UETA alignment helps U.S. organizations use electronic signatures in a legally recognized workflow.

Integrations for connected workflows

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

How RSA signing works

The RSA process follows a fixed sequence that signs the document hash, then verifies it against the public key.

Hash document: Create a hash of the document.
Apply RSA: Sign the hash with the private key.
Share record: Send the signed file and public key.
Confirm integrity: Verify the hash and signature match.

Quick signing steps

Use a short workflow to prepare, send, and review an RSA-backed signing record.

Upload file:
Upload the document into signNow.
Prepare form:
Add the signer and required fields.
Set workflow:
Choose the signing order and access method.
Send request:
Send the document for signature.
Check completion:
Review the completed record and audit trail.

Setting	Recommendation
Authentication method	SMS OTP with ID verification
Signature type	Digital signature with certificate-backed RSA
Audit trail	Enable full timestamped event 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 or mobile app on Windows, macOS, iOS, or Android with TLS 1.2 or TLS 1.3 enabled.

Desktop browsers Chrome, Firefox, Edge, and Safari support web signing.
Operating systems Windows, macOS, iOS, and Android are supported.
Security protocol TLS 1.2 or TLS 1.3 required for secure access.

For regulated workflows, managed devices, SSO, and certificate validation help keep access controlled. signNow supports browser-based signing and mobile use, which fits distributed teams that need secure review, signing, and record retention across office and field environments.

Security and compliance

Data at rest:

AES-256 protects stored data.

Transport security:

TLS secures data in transit.

Control assurance:

SOC 2 Type II available.

Information security:

ISO 27001 certified.

Healthcare support:

HIPAA support with BAA.

Regulated workflows:

eIDAS and 21 CFR Part 11 support.

Enterprise operations

Xerox needed flexible signature routing tied to NetSuite records.

Right signatures in the right formats.

The workflow aligned approvals with ERP data and reduced format mismatches in document handling.

Revenue operations

Tech Data focused on faster internal and external customer service.

Speed to revenue improved.

SignNow helped shorten turnaround time while keeping the signing process organized and traceable across teams.

Best practices for RSA signing

A careful setup makes RSA signatures easier to verify, easier to defend, and easier to retain for U.S. business records.

Keep identity and hash linked

Use certificate-backed signing for records that may face later review, and keep the signer identity, timestamp, and document hash together in the same workflow.

Protect private keys

Protect private keys with strong access controls, hardware-backed storage where possible, and limited admin access for signing credentials.

Check certificate status

Validate certificate status before accepting the signed file, especially when documents may be reviewed after the signing date.

Store the audit trail

Retain the audit trail with the signed record so reviewers can confirm intent, sequence, and integrity without searching separate systems.

FAQ and troubleshooting

These questions focus on verification, retention, plan limits, and compliance details that matter in U.S. signing workflows.

signNow Business includes audit trails, templates, and mobile apps. For HIPAA use, a BAA is required, and the workflow should preserve signer identity, timestamps, and record history.

If a signed PDF fails verification, check whether the certificate expired, was revoked, or the document changed after signing. RSA verification depends on the stored hash matching the current file.

For HIPAA records, keep signed documents for 6 years under 45 CFR 164.530(j)(2). signNow can support retention workflows, but your internal policy still controls the final archive period.

If you need bulk send, signNow Business Premium includes it. Entry plans may not include every advanced workflow feature, so confirm plan details before routing large signer groups.

For 21 CFR Part 11 workflows, use unique user IDs, secure timestamps, and retained document history. signNow can support controlled signing records, but validation remains your responsibility.

If a signer says they never signed, the audit trail should show identity checks, timestamps, and document events. Under ESIGN and UETA, that evidence helps attribute the signature to the person.

signNow	DocuSign	Adobe Acrobat Sign	PandaDoc
ESIGN and UETA support	Yes	Yes	Yes
Audit trail	Audit trail	Audit trail	Audit trail
Mobile signing	Yes	Yes	Yes
Envelope limit	No cap	100/yr	Not verified

Day 0:

Set up the workspace and signing roles.

Day 1:

Send the first document for signature.

Week 1:

Onboard the full team and review logs.

7-day trial:

signNow offers a 7-day free trial.

HIPAA retention:

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

FINRA retention:

Broker-dealer records may require 6 years under FINRA Rule 4511.

Part 11 records:

Retain secure audit trails for FDA-regulated records.

UETA baseline:

UETA supports electronic records in 49 states, D.C., Puerto Rico, and the U.S. Virgin Islands.

Risks of poor RSA handling

Weak evidence

Document may be disputed in court.

Broken hash

Signature may fail verification.

Retention gap

Record may miss retention rules.

Missing logs

Audit trail may be challenged.

Signer authentication:

Verify the signer through the configured authentication method.

Timestamp capture:

Capture the exact UTC timestamp for each action.

Document hashing:

Hash the document before and after signing.

Tamper-evident sealing:

Seal the record with tamper-evident metadata.

Event logging:

Log IP address, device data, and event order.

Audit-trail export:

Export the audit trail for review or retention.

	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	Yes	Not verified	Not verified	Not verified
Audit trail	Yes	Yes	Yes	Yes	Yes
HIPAA support	BAA required	BAA available	BAA available	Not verified	Not verified

28M+Documents signed

13+Years in business

4.6/5Average G2 rating