Encryption at Rest vs Encryption in Transit Explained
Understanding Encryption at Rest vs Encryption in Transit
Data security is one of the most important priorities for modern organizations. As businesses store increasing amounts of sensitive information in storage systems, cloud platforms, and backup environments, protecting that data becomes essential. Two of the most important security methods used to protect data are encryption at rest and encryption in transit.
Although both methods protect sensitive information, they serve different purposes and operate at different stages of data storage and transmission. Understanding the difference between these two types of encryption helps organizations design stronger security architectures that safeguard data against cyber threats, unauthorized access, and data breaches.
What Is Encryption at Rest?
Encryption at rest refers to protecting data while it is stored on a device or storage system. This includes data stored on hard drives, NAS devices, cloud storage platforms, or backup systems.
When encryption at rest is enabled, files are automatically converted into unreadable code using cryptographic algorithms such as AES-256 encryption. Only users or systems with the correct encryption key can decrypt and access the original data.
Encryption at rest protects data from risks such as:
Stolen storage devices
Unauthorized access to storage systems
Insider threats or data theft
Physical hardware compromise
Even if an attacker gains access to the storage device, encrypted files cannot be read without the proper decryption keys.
What Is Encryption in Transit?
Encryption in transit protects data while it is being transferred between systems. This type of encryption secures communications between devices, servers, and cloud platforms across networks such as the internet or internal corporate networks.
Common protocols used for encryption in transit include:
HTTPS
TLS (Transport Layer Security)
SSL encryption
VPN tunnels
When data travels across a network without encryption, attackers may intercept it through techniques such as packet sniffing or man-in-the-middle attacks. Encryption in transit prevents this by scrambling the data during transmission so that it cannot be read by unauthorized parties.
Key Differences Between the Two
Although both encryption methods protect data, they operate in different environments.
Encryption at rest protects stored data on disks, servers, and backup systems. Encryption in transit protects data while it moves between systems across networks.
Encryption at rest focuses on storage security, while encryption in transit focuses on network communication security.
Organizations typically need both types of encryption to create a complete security strategy.
Why Businesses Need Both Encryption Methods
Using only one form of encryption is not enough to fully protect sensitive data. For example, if data is encrypted during transmission but stored unencrypted on a server, attackers who gain access to the storage device can still read the information.
Similarly, if stored data is encrypted but transferred across networks without protection, it may be intercepted while being transmitted.
A secure infrastructure combines both encryption types to create multiple layers of protection. This layered security approach helps defend against cyber threats, internal misuse, and accidental data exposure.
Encryption in Synology Storage Systems
Modern Synology NAS platforms support both encryption at rest and encryption in transit to protect enterprise storage environments.
Synology systems allow administrators to enable AES-256 encryption for shared folders, protecting stored files from unauthorized access. At the same time, secure network protocols such as HTTPS, TLS, and encrypted backup transfers protect data during communication between devices.
These features make Synology a reliable platform for organizations that require strong security across their storage and backup environments.
Encryption and Compliance Requirements
Many regulatory frameworks require organizations to implement encryption to protect sensitive data.
Examples include:
HIPAA for healthcare data protection
GDPR for personal data privacy
SOX for financial record security
ISO 27001 information security standards
Encryption helps organizations meet compliance requirements while reducing the risk of costly data breaches.
How Epis Technology
Epis Technology helps businesses design secure IT infrastructure that integrates encryption across storage, backup, and cloud environments. By implementing Synology NAS systems, hybrid cloud backup solutions, and enterprise-grade encryption policies, Epis Technology ensures that sensitive data remains protected at every stage of its lifecycle.
The company provides services including Synology deployment, Microsoft 365 and Google Workspace backup solutions, large-scale storage architecture, and disaster recovery planning. Epis Technology configures encryption at rest for stored data and secure transfer protocols for backup and synchronization systems.