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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
TR26-267 | 17th October 2026
Tal Yankovitz

Hitting Set Generators for low-degree F2-polynomials with almost optimal density

We construct explicit hitting set generators for $\mathbb{F}_2$-polynomials in $n$ variables of degree at most $d$ with an almost optimal density, and seed length $O(d \log n+d^2)$, which is optimal for $d = O(\log n)$.

Second, we address large-field hitting set generators. The influential state-of-the-art construction by Guruswami and Xing ... more >>>


TR26-266 | 17th October 2026
Tal Yankovitz

Better Binary Tree Codes From MDS Tree Codes

Finding good tree code constructions is among the most natural questions in error-correcting codes over the Hamming channel. Unlike the usual setting, where one encodes a single message against adversarial errors, tree codes allow a sender to encode and send a stream, in an online manner, while protecting it from ... more >>>


TR26-265 | 20th October 2026
Hadar Strauss

Near-Optimal Bounds for Testing Residual-String Equality and Parenthesis Languages

Residual-String Equality, denoted $\text{ResStringEq}$, is the property consisting of all pairs of strings over $\{0,1,*\}$ that are equal after deleting all `$*$' symbols from them. This property was first introduced by Fischer, Magniez, and Starikovskaya (SODA 2018), who used it to show a lower bound on testing the $\text{Dyck}$ languages, ... more >>>


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