Cryptology ePrint Archive: Report 2021/608

Layering diverse cryptography to lower risks of future and secret attacks: post-quantum estimates

Daniel R. L. Brown

Abstract: Layering diverse cryptography is a general method to lower the risk of a future, or secret, cryptanalytic attack on a system. This report describes methods to quantifiably estimate this risk reduction.

Diversity is especially helpful in forward security because future attackers have more time to discover new attacks, making attack independence of diverse cryptography the major contribution to risk reduction. Post-quantum security is a part of forward security.

Estimates for highly sensitive data say that the security advantage of diverse layering is worth the extra usage cost, thus advising a decision to layer diverse cryptography.

Category / Keywords: foundations / applications, postquantum

Date: received 10 May 2021, last revised 28 Jul 2021

Contact author: danibrown at blackberry com

Available format(s): PDF | BibTeX Citation

Note: Typo fixes, clarification, new long section of informal discussions

Version: 20210728:192201 (All versions of this report)

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