All reports by Author Justin Holmgren:

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TR21-032
| 5th March 2021
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Justin Holmgren, Alex Lombardi, Ron Rothblum#### Fiat-Shamir via List-Recoverable Codes (or: Parallel Repetition of GMW is not Zero-Knowledge)

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TR20-120
| 12th August 2020
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Justin Holmgren, Ran Raz#### A Parallel Repetition Theorem for the GHZ Game

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TR20-038
| 15th March 2020
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Ofer Grossman, Justin Holmgren#### Error Correcting Codes for Uncompressed Messages

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TR20-035
| 23rd February 2020
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Justin Holmgren#### No-Signaling MIPs and Faster-Than-Light Communication, Revisited

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TR18-161
| 13th September 2018
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Justin Holmgren, Ron Rothblum#### Delegating Computations with (almost) Minimal Time and Space Overhead

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TR18-121
| 20th June 2018
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Justin Holmgren, Lisa Yang#### Characterizing Parallel Repetition of Non-Signaling Games: Counterexamples and a Dichotomy Theorem

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TR17-178
| 24th November 2017
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Justin Holmgren, Lisa Yang#### (A Counterexample to) Parallel Repetition for Non-Signaling Multi-Player Games

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TR16-077
| 12th May 2016
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Zvika Brakerski, Justin Holmgren, Yael Tauman Kalai#### Non-Interactive RAM and Batch NP Delegation from any PIR

Revisions: 1

Justin Holmgren, Alex Lombardi, Ron Rothblum

Shortly after the introduction of zero-knowledge proofs, Goldreich, Micali and Wigderson (CRYPTO '86) demonstrated their wide applicability by constructing zero-knowledge proofs for the NP-complete problem of graph 3-coloring. A long-standing open question has been whether parallel repetition of their protocol preserves zero knowledge. In this work, we answer this question ... more >>>

Justin Holmgren, Ran Raz

We prove that parallel repetition of the (3-player) GHZ game reduces the value of the game polynomially fast to 0. That is, the value of the GHZ game repeated in parallel $t$ times is at most $t^{-\Omega(1)}$. Previously, only a bound of $\approx \frac{1}{\alpha(t)}$, where $\alpha$ is the inverse Ackermann ... more >>>

Ofer Grossman, Justin Holmgren

Most types of messages we transmit (e.g., video, audio, images, text) are not fully compressed, since they do not have known efficient and information theoretically optimal compression algorithms. When transmitting such messages, standard error correcting codes fail to take advantage of the fact that messages are not fully compressed.

We ... more >>>

Justin Holmgren

We revisit one original motivation for the study of no-signaling multi-prover

interactive proofs (NS-MIPs): specifically, that two spatially separated

provers are guaranteed to be no-signaling by the physical principle that

information cannot travel from one point to another faster than light.

We observe that with ... more >>>

Justin Holmgren, Ron Rothblum

The problem of verifiable delegation of computation considers a setting in which a client wishes to outsource an expensive computation to a powerful, but untrusted, server. Since the client does not trust the server, we would like the server to certify the correctness of the result. Delegation has emerged as ... more >>>

Justin Holmgren, Lisa Yang

Non-signaling games are an important object of study in the theory of computation, for their role both in quantum information and in (classical) cryptography. In this work, we study the behavior of these games under parallel repetition.

We show that, unlike the situation both for classical games and for two-player ... more >>>

Justin Holmgren, Lisa Yang

We give a three-player game whose non-signaling value is constant (2/3) under any number of parallel repetitions. This is the first known setting where parallel repetition completely fails to reduce the maximum winning probability of computationally unbounded players.

We also show that the best known results on non-signaling ...
more >>>

Zvika Brakerski, Justin Holmgren, Yael Tauman Kalai

We present an adaptive and non-interactive protocol for verifying arbitrary efficient computations in fixed polynomial time. Our protocol is computationally sound and can be based on any computational PIR scheme, which in turn can be based on standard polynomial-time cryptographic assumptions (e.g. the worst case hardness of polynomial-factor approximation of ... more >>>