In regulated environments, archiving communications is only one part of the compliance obligation. Organizations must also be able to prove that archived records have not been changed since they were captured.
To address this requirement, Argus Archive introducing digital signing for archived records. Digital signing allows organizations to verify, at any time, that archived content remains exactly as it was at the moment of capture.
Digital signing is part of a holistic security approach, working together with data encryption and immutable storage to protect archived records throughout their entire lifecycle.
A Layered Approach to Security and Trust
A strong archiving system does not rely on a single control. Instead, it combines multiple safeguards, each solving a different problem:
- Encryption protects confidentiality. It ensures that only authorized users can read archived data.
- Immutable storage protects durability. It prevents records from being deleted or overwritten during the retention period.
- Digital signing protects integrity. It makes any change to the content immediately detectable.
These layers work together. Even if one control is questioned, the others remain in place. Digital signing adds an independent and verifiable layer of trust that does not depend on operational procedures or human behavior.
Why Integrity Matters for Compliance
Archived records are often reviewed long after they were created. Regulators, auditors, or courts may need to rely on them as evidence.
In these situations, it is not enough to say that systems were secure or that access was restricted. What is needed is proof – proof that the record presented is the exact record originally captured, without any alteration.
Digital signing provides this proof. It allows anyone with the appropriate access to verify that a record has not been altered, without relying on internal logs or assumptions about system behavior. This verifiable chain of custody is paramount.
What Digital Signing Actually Guarantees
Digital signing ensures that:
- Any change to an archived record can be detected.
- Integrity checks can be performed years after the data was captured.
- Verification does not depend on trusting a specific system or administrator.
- Archived records remain reliable and defensible as evidence.
Even a very small change, such as modifying a single character in a metadata field, will cause the integrity check to fail, immediately indicating tampering.
How Digital Signing Works (High Level)
The digital signing process follows a simple principle:
- The system creates a unique digital “fingerprint” of the archived content.
- This fingerprint is protected using cryptography so it cannot be changed or replaced.
- Later, the fingerprint can be recreated and compared to prove the content is unchanged.
When encryption is used, the fingerprint is created over the encrypted data. This ensures that confidentiality and integrity are applied consistently. The result is a record that can be verified at any time, without needing to trust the original system that created it.
Understanding SHA-256 in Simple Terms
Secure Hash Algorithm (SHA-256)1 is the method used to create the digital fingerprint of a file. You can think of it like a tamper-evident seal or a checksum on steroids.
- It takes any file, large or small, and produces a fixed-length value.
- If the file changes, even slightly, the result changes completely.
- It is practically impossible to create two different files with the same result.
SHA-256 is widely used across the technology industry. It is trusted by security professionals, recommended by standards bodies, and accepted by regulators and courts.
The Role of Digital Certificates and PKI
To create these signatures, the system uses Digital Certificates. Think of a digital certificate as a “high-tech passport” for your data. It is issued by a trusted authority and proves that the signature is authentic.
These certificates are part of a global standard called Public Key Infrastructure (PKI)2. PKI works with two related keys:
- A private key, which is kept secret and used to create the signature.
- A public key, which can be shared and used to verify the signature.
Only the holder of the private key can create a valid signature. Anyone with the public key can verify it. This separation is vital: it means records can be verified by auditors or third parties without exposing sensitive signing keys. Using this model aligns your archiving system with the same security protocols used for secure websites and electronic banking.
Checksums vs. Digital Signatures: The Critical Distinction
While both checksums (like a simple hash) and digital signatures use cryptographic hashing, their purpose differs:
- Checksums (Hashing Only): A checksum proves a file’s content has not changed. However, if a malicious actor has access to the file and the checksum, they could alter the file and generate a new checksum to hide their tracks. It proves “what it is,” but not “who locked it.”
- Digital Signatures: These combine the hash with a Digital Certificate. This doesn’t just prove the content is unchanged; it cryptographically proves who sealed it. Only the public key associated with that specific certificate can verify the signature, providing “non-repudiation”—the legal certainty that the record is authentic.
Meeting the Standards of Global Regulators
Digital signing is a critical component for demonstrating compliance with global standards:
- SEC 17a-43: This mandates that records be preserved in a non-rewriteable format. Digital signing adds the verifiable proof of integrity that financial auditors require.
- GDPR4: Article 32 requires “appropriate technical measures” to ensure data integrity. Digital signing is a “state of the art” control that proves personal data hasn’t been tampered with.
- HIPAA5: For healthcare, digital signing reinforces integrity safeguards for Protected Health Information (PHI), ensuring patient records remain trustworthy for legal and billing purposes.
What This Means for Business and IT Teams
For Business and Compliance teams, digital signing provides stronger evidence during audits, less uncertainty when records are reviewed years later, and a clear signal that data integrity is a top priority.
For IT and Security professionals, this delivers cryptographic proof of integrity independent of storage controls. It aligns with established security standards and ensures that verification remains reliable even as your infrastructure evolves.
Frequently Asked Questions
Does digital signing impact performance?
No. The signature is created once at the point of capture. Verification only occurs when an integrity check is requested (e.g., during an audit), so it doesn’t slow down day-to-day search or retrieval.
What happens if a digital certificate expires?
The integrity remains intact. Digital signatures use “Long-Term Validation” (LTV), which includes a timestamp proving the certificate was valid at the moment the record was signed.
Is digital signing compatible with the cloud?
Yes. Digital signing is independent of storage. It provides the same level of integrity proof whether your data resides on-premises or in a cloud environment.
Is a digital signature the same as an electronic signature?
No, and the distinction is critical for compliance. An electronic signature is a broad term for any electronic mark (like a scanned image of your handwriting or clicking “I Agree”). A digital signature, however, is a specific cryptographic process. While an electronic signature shows intent to sign, only a digital signature provides the technological proof of integrity. For highly regulated industries like finance or healthcare, digital signatures are preferred because they make tampering mathematically impossible to hide.
What happens if the data is migrated to a new storage system?
This is one of the biggest advantages of digital signing. Because the signature is cryptographically bound to the content itself (and not the hardware it sits on), the integrity remains intact during migrations. Whether you move your archives from an on-premises server to the cloud or switch storage providers, the digital signature travels with the record. You can verify the data at the new location and prove that not a single “bit” was lost or altered during the move.
A Strong Foundation for Long-Term Trust
Retention policies define how long data must be kept. Encryption protects who can read it. Immutable storage protects it from deletion. Digital signing proves that it has not been altered.
Together, these controls ensure that your archived communications remain authentic, verifiable, and defensible throughout their entire lifecycle.
References
On this page
- Secure Hash Algorithm 2: https://en.wikipedia.org/wiki/SHA-2 ↩︎
- Public Key Infrastucture: https://en.wikipedia.org/wiki/Public_key_infrastructure ↩︎
- SEC 17a-4: https://www.ecfr.gov/current/title-17/chapter-II/part-240/subpart-A/subject-group-ECFR9a3b1ee5e7a78f3/section-240.17a-4 ↩︎
- GDPR: https://eur-lex.europa.eu/eli/reg/2016/679/oj ↩︎
- HIPAA Security Standards: https://www.hhs.gov/sites/default/files/ocr/privacy/hipaa/administrative/securityrule/techsafeguards.pdf ↩︎