This repository provides implementations of the Xiao-Lai White-box SM4 encryption programs and a novel Dynamic White-box SM4 encryption scheme.
The original white-box SM4 encryption program is available in the Xiao-Lai-White-box-SM4-master folder. This implementation serves as a baseline for traditional static white-box encryption approaches.
In addition to the Xiao-Lai implementation, we provide a new Dynamic White-box SM4 encryption program in this repository. The dynamic white-box scheme demonstrates significant advantages in dynamic encryption scenarios, especially when frequent key updates are required.
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Dynamic Key Updates:
In the dynamic white-box solution, a new white-box key is used as an input to the encryption key table (TK), enabling key updates without reconfiguring the entire encryption program. This allows seamless integration of the new white-box key for the key-addition step and subsequent round operations. -
Efficiency in Frequent Key Updates:
For scenarios where keys need to be updated frequently, the dynamic white-box approach eliminates the need for regenerating lookup tables and affine transformations as required in traditional static white-box schemes. Instead, only the new white-box key is generated, allowing for rapid encryption updates. -
Reduced Storage Requirements:
With a key length of 32 bits, the dynamic white-box scheme updates only the TK input for each key update. For 32 encryption rounds, this requires just32 bits × 32 = 128 bytes, significantly reducing the memory and computational overhead compared to traditional static white-box SM4 solutions.
- Fast key updates: Optimized for scenarios that demand frequent key changes.
- Lightweight design: Requires minimal memory updates (128 bytes per key update).
- Dynamic encryption: Ensures secure, real-time adaptability to new encryption keys.
Explore the repository to learn more about the implementations and how they can be applied to your encryption needs.