The encryption strength of Transparent Data Encryption (TDE) is primarily measured by the cryptographic algorithm it uses and the key management practices in place. TDE typically employs strong symmetric-key algorithms like AES (Advanced Encryption Standard) with key lengths of 128-bit, 192-bit, or 256-bit. The higher the bit length, the stronger the encryption, as it increases the complexity of brute-force attacks.
For example, AES-256 is widely regarded as highly secure due to its 256-bit key length, making it resistant to most modern cryptographic attacks. The encryption strength also depends on how securely the encryption keys are generated, stored, and rotated.
In cloud environments, services like Tencent Cloud's TDE ensure robust encryption by leveraging industry-standard algorithms and integrating with secure key management systems, such as Tencent Cloud's Key Management Service (KMS), which provides centralized key control and audit capabilities. This ensures that data at rest is protected with high-strength encryption while maintaining compliance with security best practices.