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ECCC
Electronic Colloquium on Computational Complexity

Under the auspices of the Computational Complexity Foundation (CCF)

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About the ECCC

What we do and why

The Electronic Colloquium on Computational Complexity (ECCC) was established in 1994 as a forum and repository for the rapid and widespread interchange of ideas, techniques, and research in computational complexity. Posting on the ECCC has the status of a technical report. ECCC welcomes papers, short notes, and surveys, with
  • relevance to computational complexity,
  • clear mathematical profile, and
  • alignment with the scholarly norms.

Submissions claiming to resolve a grand challenge, such as the P vs. NP problem, may be rejected without further consideration.

Submissions containing an essential part that seems to be generated by AI tools and/or are written in a way that humans will find hard to understand, may be rejected regardless of their merits. ECCC is intended for communication among humans.

For more details see the Call for Papers.


Latest News
9th April 2023 12:21

Service Interruption

In the last few days, a Denial of Service attack was launched on universities in Israel, leading the administrators of the Israel Academic network to block access to it from the global internet. Consequently, websites such as ECCC have been accessible only from within the Israeli and European academic networks.

It seems that this blocking was just removed, and we hope it will not be put back in the future.

Needless to say, deciding on such blocking is not in our control, but we do apologize for this disruption of service.


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Latest Report Titles
Latest Reports
TR26-253 | 13th October 2026
Halley Goldberg, Jinqiao Hu, Zhenjian Lu, Jingyi Lyu, Igor Oliveira

The Gap Between Average-Case and Worst-Case Complexity

Understanding the average-case complexity of $\mathrm{NP}$ is a central goal in complexity theory and cryptography. A necessary milestone is to understand the corresponding average-case versus worst-case question for the polynomial hierarchy ($\mathrm{PH}$). In a celebrated result, Hirahara [Hir21] proved that if every distributional problem in $\mathrm{PH}$ is easy on average, ... more >>>


TR26-252 | 11th October 2026
Shubham Bhardwaj

Unconditional Separation between LL and CLL

Catalytic computation involves the study of Turing machines that are provided an additional catalytic tape (with arbitrary content) that the machine may use while ensuring that the tape contents are restored at the end of the computation. Although it is known that catalytic log-space machines are at least as powerful ... more >>>


TR26-251 | 14th October 2026
Chin Ho Lee, Shachar Lovett, Tejas Nareddy, Emanuele Viola

Pseudorandom Bits for Low-Degree Modular Polynomials

We revisit the problem of constructing explicit pseudorandom generators which output $n$ bits that look random to $n$-variate degree-$d$ polynomials modulo $m$. We give new generators with seed length $2^{O(dm^2)} \log(n/\varepsilon)$, which is optimal for any fixed $m$ and $d$. Along the way, we prove new Fourier growth bounds for ... more >>>


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