Cryptology ePrint Archive: Report 2018/1221

Using the Cloud to Determine Key Strengths -- Triennial Update

M. Delcourt and T. Kleinjung and A.K. Lenstra and S. Nath and D. Page and N. Smart

Abstract: We develop a new methodology to assess cryptographic key strength using cloud computing, by calculating the true economic cost of (symmetric- or private-) key retrieval for the most common cryptographic primitives. Although the present paper gives the current year (2018), 2015, 2012 and 2011 costs, more importantly it provides the tools and infrastructure to derive new data points at any time in the future, while allowing for improvements such as of new algorithmic approaches. Over time the resulting data points will provide valuable insight in the selection of cryptographic key sizes. For instance, we observe that the past clear cost-advantage of total cost of ownership compared to cloud-computing seems to be evaporating.

Category / Keywords: implementation / key lengths, cloud computing

Date: received 20 Dec 2018, last revised 11 Jan 2019

Contact author: akl at epfl ch

Available format(s): PDF | BibTeX Citation

Version: 20190111:142007 (All versions of this report)

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