An authorizable and preprocessable data transmission scheme based on elliptic curves.

Area of Science:

• Cryptography and Network Security
• Information Security
• Data Transmission

Background:

• Current signcryption schemes face efficiency challenges with large data volumes and limited sender control over decryption.
• Existing methods often result in low transmission efficiency due to high encryption and communication complexities.
• Decryption by the receiver upon obtaining ciphertext reduces the sender's authority over data access.

Purpose of the Study:

• To propose a novel data security transmission scheme incorporating authorization and preprocessing.
• To enhance overall transmission efficiency and strengthen sender control over data decryption timing.
• To ensure data confidentiality and authorization unforgeability.

Main Methods:

• A preprocessing step is introduced for computationally intensive encryption and transmission operations.
• A one-time public key is generated using Schnorr's signature R value, sender's public key, and receiver's public key for data encryption.
• The receiver decrypts data only after obtaining the 's' value from the sender's Schnorr signature, enabling authorization.

Main Results:

• The proposed scheme demonstrates high efficiency, with algorithms executing rapidly (e.g., encryption at 28.37 ms for 1KB).
• Preprocessing reduces execution time by approximately 68% for data sizes ranging from 50KB to 1600KB.
• The scheme ensures authorization unforgeability, data confidentiality, and sender-controlled decryption timing.

Conclusions:

• The novel scheme significantly improves data security transmission efficiency and sender control.
• Preprocessing combined with authorization signatures offers a robust solution for secure data handling.
• This approach enhances data confidentiality and unforgeability while maintaining high performance.