Voice Data Security: Decree 13/2023 & ISO 27001

In the era of digital transformation, voice data is far more than just audio; it contains sensitive personal information and trade secrets. Careless handling can lead to severe legal risks under Decree 13/2023 and unpredictable cybersecurity vulnerabilities. This article provides a deep dive into building a robust Voice Data Security system that meets both Vietnamese legal requirements and international ISO 27001 standards, allowing enterprises to confidently leverage the power of AI.

Why is Voice Data a Primary Target?

Biometric voice data is unique: it is tied to personal identity and cannot be changed like a password or credit card. When enterprises deploy AI solutions for meetings, customer care centers, or work notes, the volume of audio collected and processed is massive. If not protected correctly, this data can be stolen, forged, or misused, causing reputational and financial damage to the organization.

Under Decree 13/2023/ND-CP on personal data protection, biometric data (including voice) is classified as sensitive personal data. Processing this category requires explicit consent from the data subject and the highest levels of cybersecurity protection. Additionally, ISO 27001 is a comprehensive information security management framework, requiring enterprises to have strict risk control processes, access management, and data encryption.

Complying with Decree 13/2023: The Legal Foundation

To ensure legality when processing voice data, enterprises must adhere to the following core principles:

• Transparency and Consent: You must clearly inform users about the purpose of collection, storage duration, and how voice data is processed. Consent must be voluntary and specific, not bundled with general terms of service.
• Purpose and Time Limitation: Voice data should only be collected and stored within the scope of the declared purpose and for the shortest necessary time. After speech-to-text conversion is complete, original audio files should be deleted or strongly encrypted if they no longer have utility.
• Safety and Security: Enterprises are responsible for implementing technical and organizational measures to prevent unauthorized access, loss, or corruption of data.

A common mistake many businesses make is storing original audio files long after the text content has been extracted. This is a major risk because audio files contain more biometric information than text transcripts.

Applying ISO 27001 to Voice Data Governance

ISO 27001 is not just a certification but a management system. When applied to voice data, enterprises should focus on the following Control Domains:

1. Access Control

Not everyone needs access to raw voice data. Apply the "Least Privilege" principle. Only operations engineers or system administrators should have access to servers storing audio data. Access must be logged in audit logs for compliance auditing.

2. Data Encryption (Cryptography)

This is the most critical shield. Voice data must be encrypted in both states:

• Data In-Transit: Use TLS 1.2 or higher protocols to protect audio streams when transmitted from user devices to servers.
• Data At-Rest: Apply end-to-end encryption or strong encryption algorithms like AES-256 for audio files and databases containing biometric information.

3. Physical and Environmental Security

Servers storing voice data must be located in certified data centers with fire prevention, anti-theft systems, and strict access control.

Practical Example: Building a Security Workflow for Vietnamese AI

Consider a scenario where an enterprise deploys a system to record and transcribe internal meetings. To meet safety standards, the workflow should be designed as follows:

1. User Interface: Display a clear warning before recording starts, allowing users to refuse.
2. Transmission: The audio stream is sent over a TLS-secured WebSocket channel, ensuring no one can intercept or eavesdrop on the transmission.
3. Processing: The AI system receives data, converts it to text, and returns the result. The original audio file is not stored permanently on public servers but is encrypted or deleted after a short period (e.g., 24 hours), unless specific legal requirements dictate otherwise.
4. Access Control: The extracted text is stored in a document management system where only meeting participants have viewing rights.

This approach minimizes the attack surface and strictly adheres to the spirit of Decree 13/2023.

Security Level Comparison: Basic vs. High Compliance

Criteria	Basic System	System Compliant with Decree 13/2023 & ISO 27001
Transmission Encryption	HTTP (Insecure)	HTTPS/WebSocket with TLS 1.2+
Raw Data Storage	Public or Unencrypted	AES-256 Encryption, Strict Access Control
Storage Duration	Indefinite	Automatic Deletion After Necessary Short Period
Logs	None or Limited	Complete Logging of All Access and Operations
Risk Assessment	Not Performed	Periodic Assessment per ISO 27001

Practical Advice for Enterprises

To begin your voice data security journey, technology managers should take the following steps:

1. Data Inventory: Identify exactly what voice data you are collecting, processing, and storing, where, and for how long.
2. Update Privacy Policy: Review legal documents to ensure there is a specific clause for biometric (voice) data that is clear and easy to understand.
3. Implement Encryption: Work with your technical team to ensure all audio data is encrypted in transit and at rest. Prioritize solutions that support end-to-end encryption to enhance privacy.
4. Staff Training: Employees who handle voice data (engineers, customer support) need training on security awareness and incident handling rules.

Conclusion

Voice data security is no longer an option but a mandatory requirement for any enterprise aiming for sustainable growth in the digital environment. Complying with Decree 13/2023 and applying the ISO 27001 management framework not only helps you avoid legal risks but also builds trust with customers and partners.

At AIVISION, we understand this challenge clearly. With experience deploying speech AI for hundreds of enterprises in Vietnam and abroad, we commit to integrating tight security layers, from end-to-end encryption to access management, into every product. You can learn more about our technology solutions on the Blog or contact us directly for consultation at Contact.

Start protecting your intellectual property and customer data today. You can experience the high security and accuracy of AIVISION's Vietnamese AI system by Start free now.

Frequently asked questions

Does Decree 13/2023 apply to voice data?

Yes, Decree 13/2023/ND-CP classifies biometric data (including voice) as sensitive personal data, requiring protective measures and explicit consent from the data subject.

How does end-to-end encryption help secure voice data?

End-to-end encryption ensures that only the sender and receiver (or the authorized system) can read the data. Even the service provider cannot access the original audio content without the decryption key.

Do small businesses need to comply with ISO 27001?

ISO 27001 is voluntary but strongly recommended. For small businesses, applying its core principles (such as access control and encryption) helps minimize risk and builds credibility when working with large partners.

Does AIVISION support voice data encryption?

AIVISION integrates high-level security standards, including data encryption during transmission and processing, to ensure customer data safety in accordance with international cybersecurity norms.

How can I control voice data storage duration?

Enterprises should set up auto-delete policies for original audio files after successful text extraction, or limit maximum storage time according to business needs, avoiding indefinite storage.

#Voice Data Security#Decree 13/2023#ISO 27001#Biometric Data#Speech AI Compliance#Data Privacy