A New Approach to Practical Active-Secure Two-Party Computation
This work addresses the need for efficient secure computation protocols in cryptography, offering a novel method that improves performance over prior garbled circuit-based approaches.
The paper tackles the problem of practical two-party computation secure against active adversaries by proposing a new OT-based approach, achieving over 20000 Boolean gates per second and reducing oblivious AES encryption time to less than 3 seconds per instance in batch processing.
We propose a new approach to practical two-party computation secure against an active adversary. All prior practical protocols were based on Yao's garbled circuits. We use an OT-based approach and get efficiency via OT extension in the random oracle model. To get a practical protocol we introduce a number of novel techniques for relating the outputs and inputs of OTs in a larger construction. We also report on an implementation of this approach, that shows that our protocol is more efficient than any previous one: For big enough circuits, we can evaluate more than 20000 Boolean gates per second. As an example, evaluating one oblivious AES encryption (~34000 gates) takes 64 seconds, but when repeating the task 27 times it only takes less than 3 seconds per instance.