TechFlow news, June 29, according to Vitalik Buterin's blog post (June 29, 2026), the most powerful primitive in the field of cryptography—Indistinguishability Obfuscation (iO)—has achieved theoretical feasibility under reasonable security assumptions, but the current scheme's runtime still far exceeds the lifespan of the universe, leaving a huge gap to practical application.
iO can transform any program into an "encrypted program", preserving input/output functionality while hiding internal logic, and is regarded as the ultimate cryptographic tool approaching a "trustless trusted third party". Combined with blockchain, it can theoretically enable high-value applications such as secure private voting systems without multi-party committees.
The existing strictest schemes require nesting multiple layers of cryptographic primitives such as Fully Homomorphic Encryption (FHE), Attribute-Based Encryption (ABE), Functional Encryption (FE), and Randomized Encoding (XiO), superimposed with sub-exponential security parameter requirements, resulting in comprehensive overhead reaching the order of λ^10λ^10, making it practically inoperable.
The article points out there are three future breakthrough paths: first, compressing the existing technology stack through algorithm optimization; second, constructing more concise schemes based on more aggressive lattice cryptography assumptions (such as diamond iO); third, exploring entirely new constructions completely independent of lattices (such as Local Mixed Obfuscation). The author believes that once any path succeeds, it will mean that the "problem is basically solved" in the field of cryptography.
