Privacy: Vitalik Buterin restarts cryptographic obfuscation challenge

New path to privacy protection: Vitalik Buterin explores "local hybrid" encryption obfuscation methods

Privacy has become an increasingly important research area in modern cryptography. On Friday, Vitalik Buterin released the third part of his crypto obfuscation series. This time, he focused on "local mixing"-a method to abandon lattice ciphers and elliptic curves. Inspired by hash functions and symmetric cryptography, this method aims to hide the internal logic of a program while retaining its functions, which has far-reaching implications for blockchain privacy.

In short

· Vitalik Buterin proposed "local mixing", a new encryption obfuscation method.
·This method abandons lattice ciphers and elliptic curves in favor of a hash-based idea.
·The process hides how it operates by transforming logic circuits while retaining the output results.
·Despite significant risks and technical limitations, artificial intelligence may accelerate its development.

Another path to encryption obfuscation

In his first two articles, Ethereum founder Vitalik Buterin studied the construction of lattice ciphers. The first part was released on June 29, and the second part focused on iO diamonds and was released on July 28. In this content, he changed direction. Local mixing is designed without using elliptic curves, large integer factorizations, or lattice ciphers.

In his view, this method is closer to symmetric cryptography and can be the basis for encryption and hash functions. The principle is to operate a circuit composed of logic gates such as XOR, AND, and NOT to retain the output while erasing traces of internal logic.

Circuits go through multiple stages before being confused. Vitalik Buterin describes key steps such as reversibility, hardening, small instrumentation, and mixing in his latest article. During this process, unnecessary gates complicate the analysis, change the layout, and replace some modules with replacement modules that produce the same calculation results.

Vitalik Buterin bets on reversibility and confusion

Reversibility plays a central role in the operation. A reversible gate can be rewritten by another set of reversible gates that behave exactly the same, which helps achieve the above transformation. In contrast, AND or OR gates do not provide the possibility of such rewriting.

Mixing alone is not enough to conceal the program structure, so other stages must take on most of the work. Hardening and small instrumentalization strengthen the transformation process before final confusion. The goal is always to maintain computing capabilities while making internal logic difficult to track.

This approach strives to go beyond simple visual code modifications. Circuits gradually become difficult to inspect, and privacy ultimately relies on making it difficult to understand while retaining output. This logic places the circuit transformation at the center of the method.

A road to confusion that is still full of risks

Vitalik Buterin described the local mixing as "a high-risk and bold bet." This reservation stems mainly from its association with multiple failed attempts in white-box cryptography. The authors believe that additional effort may enhance this approach, and they are willing to pay higher costs for a more robust construction.

Artificial intelligence emerged in this thinking. It may condense thirty years of development of hash functions into just a few years. This possibility distinguishes local mixing from lattice-based methods, which rely on a trade-off of security assumptions.

In his view, confusion therefore represents a particularly difficult boundary in cryptography. In a June article, he called it the "ultimate Boss of cryptography." Some highly rigorous constructions even show execution times that exceed the lifetime of the universe, so the issue involves safety and feasibility.

Interest in this research mainly stems from its application. Obfuscation can transform a program into an encrypted version while retaining standard input and the same output. Combined with blockchain, it may help achieve collusion-resistant private voting, thereby reducing the need for trust in multi-node committees.

In the future, we will mainly assess whether local mixing can overcome current limitations. Vitalik Buterin is cautious about this technology, which still carries many difficulties. However, advances in cryptography and artificial intelligence may change the scope of existing capabilities. Therefore, its feasibility will depend on safety, cost and efficiency.