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Choose a secure team chat app by matching its encryption, identity controls, administration, retention, data handling and recovery to your organization’s risks and obligations. Then verify those capabilities in the exact service plan and configuration you would use. Neither an app’s name nor a certification alone proves that it is suitable or GDPR-compliant.

Start with what your organization needs chat to protect

Before comparing products, decide what people will discuss and what could happen if messages or files were exposed, altered, lost or made unavailable. Chat may contain personal data, customer information, credentials, commercially sensitive material or incident-response details. The right safeguards depend on the information, who needs access and the consequences of a failure.

Describe the users and conversations

  • List the intended users: employees, contractors, customers, suppliers or incident responders.
  • Identify sensitive content people may send, including attachments, meeting content, search queries and account details.
  • Decide whether external guests, shared channels, mobile devices and access from outside the organization are necessary.
  • Identify any records that must be retained, exported, preserved for legal hold or available for an investigation.

Turn these needs into requirements before seeing vendor demonstrations. That helps distinguish essential controls from features that are convenient but not relevant to your risk.

Write down the threat scenarios

Consider unauthorized account access, a lost or compromised device, an employee sending information to the wrong group, malicious insiders, provider or subprocessor access, service outages, and accidental deletion. Not every organization faces these risks at the same level. A small organization sharing routine operational messages may prioritize simple administration and reliable recovery; a regulated or incident-response team may also need tightly controlled access, evidence preservation and documented assurance.

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SYNCO XTALK X2 Wireless Intercom Headsets, 2-Person Communication Headset
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Compare the controls that determine whether a product fits

Use the same questions for every candidate, including the existing platform. ENISA’s organizational selection guidance recommends considering encryption, centralized administration, strong authentication such as MFA, hosting, integrations and privacy terms. The checklist below extends those factors into a procurement comparison; it is not a product ranking.

Area Questions to resolve Why it matters
Encryption and key access Is data encrypted in transit, at rest, end-to-end, or in a combination? Which message types, calls, files, backups and search features are covered? Who controls the keys, and can the provider or an administrator access message contents? “Encrypted” does not by itself tell you which content is protected from which parties.
Identity and administration Can the service use your identity provider and SSO? Does it support MFA, account lifecycle controls, guest restrictions, centralized settings and administrative audit records? Strong controls help prevent unauthorized access and make it possible to manage access as people join, change roles or leave.
Data location and access Where are content, attachments, backups, metadata, diagnostics and support data stored and processed? Which subprocessors handle them? Can support staff access data from outside the EEA, and what transfers may occur? A regional storage location does not answer every question about processing, access or transfers.
Retention and evidence Can you set retention and deletion rules, export records, preserve required messages and support legal hold or incident response? Do these functions change encryption or key access? Retention and investigation needs can conflict with systems designed to keep content inaccessible to the provider.
Deployment and resilience Is the service cloud-based, self-hosted or available in both forms? What are the backup, recovery, availability and incident-notification arrangements? Security also depends on restoring access and data when accounts, devices or services fail.
Fit and usability Do the clients, accessibility features, group sizes, integrations, external collaboration and migration path work for staff and partners? Controls that users cannot work with may be bypassed or lead to unapproved communication channels.
Assurance and contracts What current independent audit evidence and security documentation are available? Review data-processing terms, subprocessors, breach terms and service commitments. What exactly does any certification cover? Assurance is evidence about defined controls and scope, not blanket proof that a product or your deployment complies with every obligation.

Decide whether end-to-end encryption is necessary—and compatible with your duties

End-to-end encryption is designed to prevent the service provider from reading message contents in transit between participants. It may be important when reducing provider access to content is a core requirement. Ask exactly which features receive this protection, how keys are managed, how new devices are added and what happens when a user loses access.

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Do not treat end-to-end encryption as a complete security decision. It does not replace MFA, account controls, device security, safe sharing practices or a plan for recovery. Nor does the label settle whether the service meets your organizational needs: provider-inaccessible content can complicate centralized archiving, discovery, legal holds and administration. Determine whether the product supports the records you must keep without weakening protections that matter to you.

Encryption in transit and at rest can protect data from certain forms of interception or storage exposure, but may still allow a provider or authorized administrator to access content under the service’s design and terms. Ask for feature-specific explanations rather than relying on a single marketing description. ENISA’s guidance recommends tools that support end-to-end encryption and provide sufficient information about applied key sizes and algorithms; your organization still needs to decide how that recommendation fits its recordkeeping and access requirements.

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SYNCO XTALK XPRO 4 Users Wireless Intercom Headset System with 24H Battery
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Do not treat EU data residency as the whole GDPR answer

Ask separately where each relevant data category is stored and processed, who can access it for support or operations, which subprocessors are involved, what transfers may occur, and what the contract provides. Include message content, files, backups, metadata, diagnostics and support data in the discussion. Confirm the answers for the actual tenant, service plan and configuration—not just a general product statement.

The European Commission says organizations must use technical and organizational measures appropriate to the risk of their processing. It lists encryption as one example and describes data protection by design and default, including limiting access and personal data where appropriate. GDPR does not, on the basis of that guidance, universally mandate one team-chat encryption architecture or certify a particular chat app. Your organization remains responsible for assessing how its chosen service and configuration fit the processing it performs.

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Check whether NIS2 applies to your organization

NIS2 is not a universal procurement checklist for every European organization. Applicability depends on the organization, its activities and the relevant national implementation. The European Commission describes NIS2 as a common cybersecurity framework covering 18 critical sectors and says covered entities face cybersecurity risk-management measures. Member States’ transposition deadline was 17 October 2024; the Commission page records a proposal for targeted amendments in 2026. Check current national law and your organization’s status rather than assuming the directive applies—or does not apply—based only on the chat tool.

ENISA’s technical guidance dated 26 June 2025 supports Implementing Regulation (EU) 2024/2690 for specified digital infrastructure, ICT service-management and digital-provider sectors. It is relevant to organizations within that scope, not a general checklist for every European business. If you are uncertain about applicability or sector-specific duties, confirm with the appropriate legal or compliance adviser.

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Use product examples as questions to verify, not endorsements

Microsoft Teams

Microsoft’s Teams security documentation states that Teams supports organization-wide two-factor authentication, Microsoft Entra ID single sign-on, and encryption in transit and at rest. It also says Teams data resides in the geographic region associated with the organization’s Microsoft 365 or Office 365 organization. These are vendor statements, not an independent assessment of a particular tenant. Confirm the region for your tenant, which data categories the statement covers, and the current support, transfer and service terms.

Signal

A CERT-EU hardening guide dated 3 March 2022 describes Signal communications as end-to-end encrypted, discusses operational hardening and notes that phone numbers are used as identifiers. That guide can inform consideration of a secure messaging channel, but it is not a current enterprise procurement comparison. It does not establish that Signal provides the administration, retention, discovery or contractual controls your organization may require; verify current capabilities for your use case.

These examples illustrate why a familiar product name is not a decision. ENISA’s 2019 report on secure group communications for incident-response communities found that approaches examined at that time did not satisfy every criterion, such as end-to-end encryption, mature multi-platform support, secure group chat or an open specification. It also discusses tension between message archives and forward secrecy. Treat those observations as a reminder to test the requirements together, not as a current comparison of products.

Run a controlled evaluation before rollout

  1. Set pass/fail requirements. Document the information handled, identity and guest-access needs, required retention, geographic constraints, resilience expectations and applicable legal obligations.
  2. Request written evidence. Ask vendors for encryption coverage by feature, key-access details, current audit scope, data-processing terms, subprocessors, data-location details and incident-notification commitments.
  3. Test the intended configuration. In a pilot, check MFA and SSO, account removal, guest access, administration, exports, deletion, recovery and the tools people actually need across their devices.
  4. Test failure and governance scenarios. Verify what happens after a lost device, a user departure, an accidental deletion, a service outage or a suspected account compromise. Check that audit and retention functions work as expected.
  5. Record the decision and owners. Document why the service fits, who administers it, who reviews access and settings, and when the organization will reassess the choice.

FIDO2 security keys may be one way to implement MFA when compatible with the organization’s identity provider. A key is an authentication measure, not proof that the chat service itself is secure or compliant.

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