Amber Preview
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Oleksandra Lapiha
Feb 17, 2026, 12:12:16 PM (5 days ago) Feb 17
to mptc-...@list.nist.gov, amber...@googlegroups.com
Dear MPTC Friends,
We are excited to share the preview of our submission, Amber: a Family of Efficient Lattice-Based IND-CCA Threshold KEMs, for the NIST Threshold Call. Please find our preview talk slides from the MPTS 2026 Workshop here !
Amber is a post-quantum Threshold KEM (TKEM) that uses the BCHK+ transform to convert a Threshold Identity-Based Encryption (TIBE) scheme into a TKEM, resulting in strong security guarantees like IND-CCA2.
A key advantage of Amber is its use of light-weight lattice techniques! This construction avoids the need for heavy machinery like generic Fully Homomorphic Encryption (FHE), Multi-Party Computation (MPC), or Non-Interactive Zero-Knowledge (NIZK) proofs to achieve a CCA-secure TKEM.
Please note: We are looking for a skilled implementer to join our team. Due to the simple building blocks, we expect that Amber can be implemented in a very efficient way, and we already have an internal Python implementation.
For more details, you can refer to our papers:
Best regards,
Sasha, for the Amber team
We are excited to share the preview of our submission, Amber: a Family of Efficient Lattice-Based IND-CCA Threshold KEMs, for the NIST Threshold Call. Please find our preview talk slides from the MPTS 2026 Workshop here !
Amber is a post-quantum Threshold KEM (TKEM) that uses the BCHK+ transform to convert a Threshold Identity-Based Encryption (TIBE) scheme into a TKEM, resulting in strong security guarantees like IND-CCA2.
A key advantage of Amber is its use of light-weight lattice techniques! This construction avoids the need for heavy machinery like generic Fully Homomorphic Encryption (FHE), Multi-Party Computation (MPC), or Non-Interactive Zero-Knowledge (NIZK) proofs to achieve a CCA-secure TKEM.
Please note: We are looking for a skilled implementer to join our team. Due to the simple building blocks, we expect that Amber can be implemented in a very efficient way, and we already have an internal Python implementation.
For more details, you can refer to our papers:
- Initial ASIACRYPT 2025 paper: eprint.iacr.org/2025/1958
- Follow-up PKC 2026 paper: eprint.iacr.org/2026/021
- NIST MPTC Preview Writeup and Slides
Best regards,
Sasha, for the Amber team
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