Top Data Lake Security Best Practices 2025

Explore how Kellton safeguarded its data lake and prevented a major breach. Learn top data lake security challenges, best practices, and expert strategies for 2025.

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Data Lake Security Best Practices 2025
Explore how Kellton safeguarded its data lake and prevented a major breach. Learn  top data
lake security challenges, best practices, and expert strategies for 2025.
 
A global healthcare analytics firm approached Kellton facing a critical challenge: their AWS-
based data lake stored sensitive patient information for population health studies, but their
security posture had not evolved with their rapid data growth. The organization processed
medical records for over fifteen million patients across multiple countries, supporting research
into treatment efficacy and disease prevention.
However, their access controls relied on overly broad IAM policies, encryption was
inconsistently applied, and audit logging provided insufficient visibility into data access
patterns.
The turning point came when their internal audit team discovered that multiple service
accounts had excessive permissions, contractor access had not been revoked after
engagement completion, and several storage buckets containing protected health information
lacked encryption. Recognizing the magnitude of potential HIPAA violations and the
reputational damage a breach would cause, leadership engaged Kellton to architect a
comprehensive security transformation. Our team conducted a thorough security assessment,
identifying twenty-three high-risk vulnerabilities and fourteen compliance gaps that required

2. immediate remediation.
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Data Lake Security Challenges & Best Practices | Kellton Guide 2025