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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. The Electronic Colloquium on Computational Complexity welcomes papers, short notes, and surveys, with
  • relevance to the theory of computation,
  • clear mathematical profile, and
  • strictly mathematical format.

Central topics

  • models of computation and their complexity.
  • complexity bounds and trade-offs (with the emphasis on lower bounds).
  • complexity theoretic aspects of specific areas including coding theory, combinatorics, cryptography, game theory, logic, machine learning, optimization, property testing, and quantum computation.
For more details see the Call for Papers.

More reading

Here are some papers on the idea and concept of electronic colloquia and ECCC.

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
TR26-171 | 7th September 2026
Minbo Gao, Zhengfeng Ji, Ziyi Xie

Quantum Query Advantage Requires Space

Hao, Huang, and Liu (STOC'26) recently showed that optimal quantum query complexity may require large workspace even for short-output problems, and asked whether a quantum query advantage over classical computation can itself require space. We resolve this question by exhibiting an explicit total Boolean function with quantum query complexity $Q=\widetilde{\Theta}(M)$, ... more >>>


TR26-170 | 14th August 2026
Pushkar Joglekar, Sandip Shinde, Aarti Agarkar

Adversary Lower Bounds for Lattice Problems

The Shortest Vector Problem (SVP) and the Closest Vector Problem (CVP) are the fundamental algorithmic questions in the geometry of numbers. In the past two decades, their algorithmic complexity has been studied quite extensively due to their connection with lattice based cryptosystems. In this paper, we study these problems in ... more >>>


TR26-169 | 5th September 2026
Fernando Granha Jeronimo

Algorithmic List Decoding at Capacity and Optimal Proximity Gaps for Reed--Solomon Codes

We give a unified hidden-derivative framework for list decoding and mutual correlated agreement of ordinary Reed--Solomon codes over prime fields, on arbitrary prescribed evaluation sets. For every fixed slack $\gamma>0$, every sufficiently large block length $n$, every prime $q\ge n$, and every dimension $1\le k\le(1-\gamma)n$, a deterministic algorithm finds all ... more >>>


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