The following publications are possibly variants of this publication:
- Using the Cloud to Determine Key StrengthsThorsten Kleinjung, Arjen K. Lenstra, Dan Page, Nigel P. Smart. indocrypt 2012: 17-39 [doi]
- Using the Cloud to Determine Key Strengths - Triennial UpdateM. Delcourt, Thorsten Kleinjung, Arjen K. Lenstra, S. Nath, Dan Page, Nigel P. Smart. iacr, 2018:1221, 2018. [doi]