Introduction

Digital evidence plays a critical role in modern law enforcement. Body-Worn Camera (BWC) footage, in-car video, interview recordings, photographs, surveillance footage, documents, and other digital files may contain sensitive information that must remain protected throughout its lifecycle.

As agencies increasingly rely on cloud-based Digital Evidence Management Systems (DEMS), secure evidence sharing, and remote access, protecting data from unauthorized access becomes even more important. One of the most important technologies used to safeguard digital evidence is encryption.

Encryption transforms readable information into protected data that generally cannot be understood without the appropriate cryptographic key. When properly implemented, encryption can help protect evidence while it is stored, uploaded, transferred, backed up, and shared with authorized users.

Understanding how encryption works—and where it should be applied—helps public safety agencies evaluate evidence platforms, strengthen cybersecurity, and make more informed technology decisions.

What Is Encryption?

Encryption is a security process that converts readable data, often called plaintext, into an unreadable form known as ciphertext.

A cryptographic algorithm and encryption key are used to perform this transformation. Authorized systems or users with the appropriate key can decrypt the information and return it to a usable form.

For digital evidence platforms, encryption may protect:

• Body-Worn Camera footage
• Audio recordings
• Photographs
• Case documents
• Evidence metadata
• Backups
• Shared evidence

Encryption provides an important layer of protection if data or systems are accessed improperly.

Keywords: digital evidence encryption, encryption, evidence security, Digital Evidence Management System, DEMS, cybersecurity

Why Encryption Matters for Digital Evidence

Digital evidence can contain highly sensitive information about investigations, officers, victims, witnesses, and members of the public.

Without adequate protection, unauthorized access could create serious security, privacy, and operational concerns.

Encryption can help agencies:

• Protect confidential evidence
• Reduce exposure from unauthorized access
• Secure evidence transfers
• Strengthen cloud security
• Protect backups
• Support broader cybersecurity strategies

Encryption is not a replacement for access controls, authentication, or security monitoring. Instead, it should operate as one layer within a broader defense-in-depth strategy.

Keywords: evidence protection, cybersecurity, encrypted evidence, digital evidence security, public safety technology, secure evidence management

Encryption at Rest

Encryption at rest protects information while it is stored.

Digital evidence may be stored in:

• Cloud environments
• Data centers
• Local servers
• Backup systems
• Storage devices

If the underlying storage is accessed without authorization, encryption can help prevent the stored information from being immediately readable.

For agencies maintaining large repositories of Body-Worn Camera footage and other evidence, encryption at rest should be an important consideration when evaluating storage platforms.

Keywords: encryption at rest, cloud evidence storage, encrypted storage, digital evidence protection, DEMS, evidence security

Encryption in Transit

Digital evidence also needs protection while moving between systems.

Encryption in transit protects information during transmission, such as when:

• A Body-Worn Camera uploads footage
• Evidence moves to cloud storage
• An investigator accesses a recording
• Evidence is shared with an authorized prosecutor
• Systems exchange information through an integration

Secure communication protocols help prevent intercepted data from being easily read.

Agencies should evaluate both encryption at rest and encryption in transit when reviewing evidence platforms.

Keywords: encryption in transit, secure data transfer, evidence sharing, cloud security, body-worn camera uploads, cybersecurity

Understanding Encryption Keys

Encryption depends on cryptographic keys.

An encryption key is used by an algorithm to encrypt or decrypt information. Protecting these keys is essential because compromised key management can undermine otherwise strong encryption.

Organizations should consider:

• How encryption keys are generated
• Where keys are stored
• Who can access them
• How keys are rotated
• How compromised keys are handled
• How keys are backed up or recovered

A platform's encryption claims should therefore be evaluated alongside its key management practices.

Strong encryption requires strong key protection.

Keywords: encryption key management, cryptographic keys, cybersecurity, evidence security, key rotation, digital evidence management

Symmetric and Asymmetric Encryption

Two major approaches are commonly used in modern cryptography.

Symmetric Encryption

Symmetric encryption generally uses the same secret key for encryption and decryption.

It is efficient for protecting large amounts of information and is commonly used for stored data.

Asymmetric Encryption

Asymmetric encryption uses a mathematically related public key and private key.

The two-key structure is useful for capabilities such as secure key exchange and digital signatures.

Modern systems frequently combine cryptographic techniques rather than relying exclusively on one approach.

Keywords: symmetric encryption, asymmetric encryption, public key encryption, cryptography, digital evidence security, cybersecurity

What Is AES Encryption?

Advanced Encryption Standard (AES) is a widely used symmetric encryption standard.

AES supports several key sizes:

• AES-128
• AES-192
• AES-256

Public safety agencies may encounter platforms advertising AES-256 encryption for stored evidence or other protected information.

However, the strength of an evidence platform's security cannot be determined by the encryption algorithm alone. Implementation, key management, authentication, access controls, system configuration, and operational practices also matter.

Agencies should evaluate the complete security architecture rather than relying on a single specification.

Keywords: AES-256 encryption, Advanced Encryption Standard, evidence encryption, cybersecurity, encrypted evidence storage, public safety technology

Encryption and Cloud Evidence Management

Cloud-based Digital Evidence Management Systems can store large amounts of sensitive information.

Agencies evaluating cloud platforms should ask how encryption is implemented across:

• Evidence uploads
• Cloud storage
• Backups
• Data transfers
• Evidence sharing
• System integrations

They should also understand which security responsibilities belong to the cloud provider, evidence platform vendor, and agency.

Encryption is particularly effective when combined with strong identity controls and continuous monitoring.

Keywords: cloud encryption, cloud evidence management, DEMS, secure cloud storage, digital evidence security, public safety cloud

Encryption and Secure Evidence Sharing

Evidence frequently needs to be shared with prosecutors, courts, investigators, or authorized partner agencies.

Secure evidence-sharing workflows may combine encryption with:

• User authentication
• Permission-based access
• Expiration controls
• Download restrictions
• Audit logging

Instead of relying on unsecured transfers or uncontrolled copies, modern evidence platforms can provide managed sharing environments.

This approach can improve collaboration while maintaining greater visibility over evidence access.

Keywords: secure evidence sharing, encrypted evidence transfer, prosecutor evidence sharing, evidence collaboration, DEMS, evidence security

Encryption Does Not Replace Access Control

Encrypted data can still be exposed if an attacker gains legitimate access through a compromised user account.

For this reason, encryption should work alongside:

• Multi-Factor Authentication (MFA)
• Role-Based Access Control (RBAC)
• Least-privilege permissions
• Strong password policies
• Account monitoring
• Identity and Access Management (IAM)

Encryption protects the information itself, while identity and access controls determine who is permitted to reach it.

Combining these protections creates a stronger security environment.

Keywords: identity and access management, MFA, RBAC, encryption, evidence access control, digital evidence cybersecurity

Encryption and Evidence Integrity

Confidentiality and integrity are related but different security objectives.

Encryption primarily helps protect the confidentiality of information. Agencies may use additional mechanisms to verify whether evidence has been altered.

These can include:

• Cryptographic hashing
• Digital signatures
• Audit trails
• Chain-of-custody records
• System activity logs

Together, these technologies can help agencies protect evidence and document how it has been handled.

Understanding this distinction is important when evaluating claims about evidence security.

Keywords: evidence integrity, cryptographic hashing, digital signatures, chain of custody, audit trails, digital evidence

Protecting Evidence Backups

Backup copies of evidence require the same careful security consideration as primary storage.

Agencies should evaluate whether backups are:

• Encrypted
• Access controlled
• Monitored
• Protected from unauthorized modification
• Included in recovery testing

An unsecured backup can create a security gap even when the primary evidence repository is well protected.

Backup security should therefore be included in the agency's overall encryption and disaster recovery strategy.

Keywords: encrypted backups, disaster recovery, evidence backup, cyber resilience, evidence storage, cybersecurity

Encryption and System Integrations

Modern evidence platforms increasingly connect with other public safety technologies, including:

• Records Management Systems (RMS)
• Computer-Aided Dispatch (CAD)
• Body-Worn Camera platforms
• In-car video systems
• Prosecutor workflows
• Authorized third-party applications

Information exchanged between these systems should be appropriately protected.

Agencies should evaluate how integrations authenticate systems, encrypt communications, and control access to transferred information.

Secure integrations help prevent connected systems from becoming weak points in the evidence environment.

Keywords: system integration security, RMS integration, CAD integration, encrypted communications, APIs, public safety technology

Consider Applicable CJIS Security Requirements

Agencies handling Criminal Justice Information should evaluate encryption practices against the applicable FBI Criminal Justice Information Services (CJIS) Security Policy, along with relevant state, local, contractual, and organizational requirements.

When evaluating a platform, agencies should consider areas such as:

• Encryption requirements
• Authentication
• Access controls
• Key management
• Audit logging
• Data transmission
• System security

Because cybersecurity requirements evolve, agencies should consult the current CJIS Security Policy and qualified security or compliance personnel rather than relying solely on a vendor's general claim of being "CJIS compliant."

Keywords: CJIS Security Policy, CJIS compliance, Criminal Justice Information, encryption requirements, evidence security, law enforcement cybersecurity

Questions Agencies Should Ask Vendors About Encryption

Encryption should be an important part of technology procurement.

Agencies should ask vendors:

• Is evidence encrypted at rest?
• Is evidence encrypted in transit?
• Which encryption standards and protocols are used?
• How are encryption keys protected?
• How frequently are keys rotated?
• How are backups encrypted?
• How are system integrations secured?
• How is shared evidence protected?
• What happens if credentials or keys are compromised?
• How are encryption practices updated as standards evolve?

Clear answers help procurement and IT teams evaluate the overall security architecture instead of relying on marketing claims.

Best Practices for Protecting Encrypted Evidence

A strong encryption strategy should be part of a broader cybersecurity program. Agencies should:

• Encrypt sensitive evidence at rest
• Protect evidence during transmission
• Use established cryptographic standards
• Secure encryption keys
• Implement strong IAM controls
• Require MFA where appropriate
• Maintain detailed audit logs
• Protect backups
• Secure system integrations
• Regularly review security configurations
• Keep platforms and devices updated
• Evaluate applicable security requirements

Encryption is most effective when supported by multiple complementary security controls.

Conclusion

Encryption is one of the foundational technologies used to protect modern digital evidence. From Body-Worn Camera footage and photographs to interview recordings and case-related documents, sensitive information may need protection while stored, transmitted, backed up, and shared.

However, effective evidence security requires more than simply selecting a platform that advertises encryption. Agencies should understand how encryption is implemented, how cryptographic keys are protected, how users are authenticated, how access is controlled, and how evidence integrity and system activity are monitored.

By combining encryption with strong Identity and Access Management, Multi-Factor Authentication, audit trails, secure backups, and comprehensive cybersecurity practices, agencies can build a more resilient digital evidence environment. Understanding these protections also enables procurement teams and technology leaders to ask better questions when evaluating evidence platforms.

Learn More

Looking to strengthen the security of your agency's digital evidence?

Modern Body-Worn Cameras (BWCs) and Digital Evidence Management Systems (DEMS) can combine encrypted evidence storage and transmission with secure access controls, detailed audit trails, centralized evidence management, and protected evidence-sharing workflows.

Whether your agency is modernizing an existing evidence environment or deploying a new Body-Worn Camera program, understanding encryption can help your team make better-informed cybersecurity and procurement decisions.

Request a demo today to explore how a modern digital evidence platform can help your agency securely store, manage, access, and share critical evidence.