Lightweight Cryptography

Project Overview

There are several emerging areas (e.g. sensor networks, healthcare, distributed control systems, the Internet of Things, cyber physical systems) in which highly-constrained devices are interconnected, typically communicating wirelessly with one another, and working in concert to accomplish some task. Because the majority of current cryptographic algorithms were designed for desktop/server environments, many of these algorithms do not fit into constrained devices.  

NIST has initiated a process to solicit, evaluate, and standardize lightweight cryptographic algorithms that are suitable for use in constrained environments where the performance of current NIST cryptographic standards is not acceptable. NIST has published a call for algorithms (test vector generation code) to be considered for lightweight cryptographic standards. The deadline for submitting algorithms has passed.

Round 1 Candidates

NIST received 57 submissions to be considered for standardization. After the initial review of the submissions, 56 were selected as Round 1 Candidates.   

Round 2 Candidates

Due to the large number of submissions and the short timeline of the NIST lightweight cryptography standardization process, some of the candidates were eliminated from consideration early in the first evaluation phase in order to focus analysis on the more promising candidates. Of the 56 Round 1 candidates, 32 were selected to continue to Round 2.

Next Steps

  • NIST is inviting submitters of the Round 2 candidates to provide a short (up to 5 pages) update on their algorithms. Specifically, NIST is interested in updates on

    • new proofs/arguments supporting the security claims,
    • new software and hardware implementations (including ones that protect against side channel attacks),
    • new third-party analysis and its implications,
    • platforms and metrics in which the candidate performs better than current NIST standards,
    • target applications and use cases for which the candidate is optimized,
    • planned tweak proposals, if submission accepted as a finalist, and
    • any other relevant information.

The updates must be provided electronically in PDF format and sent to before September 18, 2020. NIST will post the updates on the project webpage.

  • NIST plans to host the Fourth Lightweight Cryptography Workshop (virtual) on October 19-21, 2020, to discuss various aspects of the second-round candidates and to obtain valuable feedback for the upcoming selection of the finalists. 
  • NIST plans to announce the finalists before the end of December 2020.  


Date Event
July 20-21, 2015  First Lightweight Cryptography Workshop at NIST 
August 11, 2016  (Draft) NISTIR 8114 is published. 
October 17-18, 2016 Second Lightweight Cryptography Workshop at NIST   
October 31, 2016  End of public comment period to Draft NISTIR 8114 
Public comments received (August 11 - October 31,2016) 

March 28, 2017 

NISTIR 8114, Report on Lightweight Cryptography is published. 
April 26, 2017 (Draft) Profiles for Lightweight cryptography standardization process is published. 
June 16, 2017  Public comments received (April 26 - June 16, 2017) 
May 14, 2018  (Draft) Submission Requirements and Evaluation Criteria for the Lightweight cryptography standardization process is published.
May 14, 2018 Federal Register Notice is published. 
June 28, 2018  End of public comment period to the submission requirement. 
Public comments received (May 14-June 28, 2018). 
August 27, 2018 Federal Register Notice is published
August 27, 2018  Submission Requirements and Evaluation Criteria for the Lightweight Cryptography Standardization Process is published.
January 4, 2019 Early submission deadline for early feedback 
February 25, 2019  Submission deadline
March 29, 2019 Amendment Deadline
April 18, 2019  Announcement of the Round 1 Candidates
August 30, 2019 Announcement of Round 2 Candidates
October 7, 2019 NISTIR 8268, Status Report on the First Round of the NIST Lightweight Cryptography Standardization Process is published
November 4-6, 2019  Third Lightweight Cryptography Workshop at NIST
October 19-21, 2020 Fourth Lightweight Cryptography Workshop (virtual)



Lightweight Crypto Technical Inquiries

Lawrence Bassham

Çağdaş Çalık

Donghoon Chang

Jinkeon Kang

John Kelsey

Kerry McKay

Meltem Sönmez Turan


Security and Privacy: cryptography

Created January 03, 2017, Updated September 21, 2020