International Association
for Cryptologic Research

Event date: 14 September to 18 September 2025

Event date: 4 September to 7 September 2024

Event date: 10 September to 14 September 2023

Since 2015, a crypto engineering challenge is organized every year in cooperation with CHES. Former editions have focused on practical side-channel attacks, design of countermeasures, deep learning-based attacks, white-box cryptography, and hardware security.

We welcome proposals of challenge organisation for CHES 2023.

Interested? Please refer to the call: https://ches.iacr.org/2023/challenge.php

CHES 2022 will take place in Leuven, Belgium in September 18-21, 2022.

The registration site is now open. Early registration is until August 18th.

TASER: Topics in hArdware SEcurity and RISC-V
affiliated workshop at CHES 2022
https://ches.iacr.org/2022/affiliated.php

Final call for the CHES test of time award 2022

The deadline for nominations is May 2nd: https://ches.iacr.org/2022/testoftime.php

Event date: 18 September to 21 September 2022

Since 2015, a crypto engineering challenge is organized every year in cooperation with CHES. Former editions have focused on practical side-channel attacks, design of countermeasures, deep learning-based attacks, white-box cryptography, and hardware security.

See for instance:

• [https://whibox.io/contests/](https://whibox.io/contests/)
• [https://hackatevent.org/hackches21/](https://hackatevent.org/hackches21/)
• [https://ctf.spook.dev/](https://ctf.spook.dev/)
• [https://chesctf.riscure.com/2018/news](https://chesctf.riscure.com/2018/news)

We welcome any proposals of challenge organisation for CHES 2022.
The challenge organisers are responsible for preparing the challenge announcement, write a comprehensive set of rules, and setup the challenge server (or website). They take care of running the challenge and organising the challenge ceremony at CHES.

If you wish to propose a challenge, please contact Matthieu Rivain ([matthieu.rivain@cryptoexperts.com](mailto:matthieu.rivain@cryptoexperts.com)) with a short description of the challenge (goals, rules, server, etc.) and the organising team.

CHES 2021 will take place virtually on 13-17 September 2021.

The registration site is now open. Registration for CHES 2021 is free for IACR members; non-IACR members will be asked to pay the IACR membership fee (USD 50 regular, USD 25 for students) during registration.

Since 2015, a crypto-engineering challenge is organized every year in cooperation with CHES.

This year the CHES Challenge has two tracks:

• A hardware security challenge: HACK@CHES 2021
• A white-box cryptography challenge: The WhibOx Contest 2021

HACK@CHES 2021 challenges participants to discover hardware vulnerabilities in an SoC. Winners will be awarded with fame and a 2000$ cash prize. Challenge website: https://hackatevent.org/hackches21/

The WhibOx Contest 2021 challenges participants to design and/or break white-box implementations of ECDSA. Winners will be awarded with fame and a 2000$ cash prize. Challenge website: https://whibox-contest.github.io/2021/

Spread the word and have fun!

CHES 2020 will be held from September 14 to 17 as a virtual event.

To register for CHES 2020, please visit the CHES 2020 registration site. Registration for CHES 2020 is free for IACR members; non-IACR members will be asked to pay the IACR membership fee (USD 50 regular, USD 25 for students) during registration.

You can follow any updates on twitter @2020CHES.

The CHES 2020 Capture the Flag (CTF) is a side-channel cryptanalysis challenge against masked implementations of the Clyde-128 Tweakable Block Cipher (TBC) which is part of the Spook candidate to the NIST lightweight cryptography competition (https://www.spook.dev/).

Different targets are proposed in parallel, both in software and in hardware, corresponding to masked implementations with various number of shares. Challengers are provided with the source code of the implementations (C in software and Verilog in hardware/FPGA), a tool to predict intermediate values of the hardware implementation, profiling sets of traces including the nonces, (random) keys, (random) plaintexts and the randomness used for masking, test sets of traces corresponding to a few fixed keys (without the masking randomness), and finally prototype attacks against a single byte of the secret key for exemplary targets.

The goal of the challenge is to modify and improve the prototype attacks. The submitted attacks will be rated based on the number of measurements needed to reduce the rank of the master key below 2^32 using a rank estimation algorithm. All the attacks submitted will be made public to all challengers (under a GPLv3 license or alternatives).

Link to the challenge website: https://ctf.spook.dev/

Due to the coronavirus pandemic, its consequences and the uncertainty regarding when it will be under control and eventually stopped, the CHES Steering Committee in coordination with the local organizers for 2020 and 2021 as well as with the IACR Board of Directors decided today to turn CHES 2020 into a virtual event and to postpone the schedule for physical conferences by one year. That means:

• CHES 2020 online,
• CHES 2021 Beijing

For contractual and planning purposes a decision had to be made now. We are convinced that there is currently too much uncertainty for an attempt to postpone CHES 2020 by a couple of weeks or months.

Please note that the TCHES publication cycle is not affected by this decision.

We apologize for any inconvenience caused and hope that we can all enjoy CHES 2021 in Beijing under normal conditions. In the meantime, please stay tuned for updates concerning the first virtual CHES 2020 in the next weeks!

The CHES Steering Committee

The videos of talks at CHES 2019 are now on the IACR YouTube channel

Event date: 14 September to 17 September 2020

Cryptographic Hardware and Embedded Systems (CHES) 2019

Atlanta, GA, August 25-28, 2019
https://ches.iacr.org/2019/

The Cryptographic Hardware and Embedded Systems (CHES) conference is the premier venue for research on design and evaluation of cryptographic implementations and secure embedded systems. CHES 2019 marks the 20th anniversary of the CHES conference and will take place in the city of Atlanta, U.S.A., August 25–28, 2019, immediately following CRYPTO 2019.

Due to a recent health hazard with Sheraton Atlanta, CHES 2019 will change its venue to the nearby Westin Peachtree Plaza. Please find updated information below regarding registration and hotel booking.

Registration
CHES 2019 registrations are open at https://ches.iacr.org/2019/registration.shtml
The early registration deadline has been extended from July 24, 2019 to Aug. 7th, 2019 to accommodate the venue change.

Hotel
The conference venue is the Westin Peachtree Plaza, a 70th-floor prime location in downtown Atlanta. The hotel provides a time-limited block rate to CHES 2019 attendees until Aug. 7th, 2019, 5pm (EST). Book a hotel room at the regular CHES 2019 rate ($159/night and up)

Please let us know in your registration form if you plan to stay at the Westin. For people who have made hotel reservation with Sheraton Atlanta, please follow the guidelines on the CHES 2019 venue page for actions to adapt.

Program
CHES 2019 offers a broad collection of events:

• Three days of conference with top-notch paper presentations, with papers accepted and published by TCHES
• Two invited keynote talks
• Six half-day tutorials by experts in the field
• Two co-located pre-conference events, FDTC and PROOFS
• A banquet at Sundial Restaurant, situated on the uppermost floors of the Westin Peachtree Plaza
• A social event at the Martin Luther King National Historical Park

Travel
CHES 2019 is organized in Downtown Atlanta and is easily reachable from the Atlanta International Airport (ATL). Consult the CHES 2019 Travel Information Page for additional guidelines.

Cryptographic Hardware and Embedded Systems (CHES) 2019

Atlanta, GA, August 25-28, 2019

https://ches.iacr.org/2019/

The Cryptographic Hardware and Embedded Systems (CHES) conference is the premier venue for research on design and evaluation of cryptographic implementations and secure embedded systems. CHES 2019 marks the 20th anniversary of the CHES conference and will take place in the city of Atlanta, U.S.A., August 25–28, 2019, immediately following CRYPTO 2019.

Registration
CHES 2019 registrations are now open at https://ches.iacr.org/2019/registration.shtml
The early registration deadline ends on July 24, 2019.

Program
CHES 2019 offers a broad collection of events:

• Three days of conference with top-notch paper presentations, with papers accepted and published by TCHES;
• Two invited keynote talks;
• Six half-day tutorials by experts in the field;
• Two co-located pre-conference events, FDTC and PROOFS
• A banquet at Sundial Restaurant, a 70th-floor prime location in downtown Atlanta
• A social event at the Martin Luther King National Historical Park

Hotel
The conference venue is the Sheraton Hotel in downtown Atlanta. The hotel provides a time-limited rate to CHES 2019 attendees.

• Book a hotel room at the regular CHES 2019 rate ($159/night and up; in June, a limited number of rooms at a special $139/night rate are available for reservation for CHES 2019)
• Book a hotel room at the student CHES 2019 rate ($99/night)

These rates are cancellable – but if you want even lower nonrefundable rates, use the main Sheraton-Atlanta website. Please let us know in your registration form that you plan to stay at the Sheraton.

Travel
CHES 2019 is organized in Downtown Atlanta and is easily reachable from the Atlanta International Airport (ATL). Consult the CHES 2019 Travel Information Page for additional guidelines.

The annual CHES conference highlights new results in the design and analysis of cryptographic hardware and embedded system implementations. CHES provides a valuable connection between the research and cryptographic engineering communities and attracts participants from industry, academia, and government organizations.

The program co-chairs welcome proposals for half-day tutorials at CHES 2019. The scope of topics include but are not limited to: cryptographic implementations, attacks against implementations and countermeasures, tools and methodologies for secure designs, security issues in the field including Internet-of-Things, Cyber-Physical Systems, etc. We will compensate the presenters of each accepted proposal with one complimentary registration to CHES 2019 and a fixed amount of stipend towards their travel costs (for multiple presenters, these will be split among them).

Please submit your single-page pdf proposal for a tutorial including title, speaker name, speaker affiliation, and abstract by Apr. 19th, 2019, 23:59 EST to CHES 2019 Program Co-chairs at ches2019@iacr.org. Accepted tutorials will be announced by May 10th, 2019.

Event date: 25 August to 28 August 2019