Next meetup scheduled: Practical q-IND-CPA-D-Secure Approximate Homomorphic Encryption w/ Lea Nürnberger
on Jul 18th, 5pm CEST (Paris, FR)
🗓️ The next FHE.org meetup is scheduled for this week, Thursday, Jul 18th at 5pm CEST (Paris, FR).
The meetup features Lea Nürnberger, a third year PhD student at the Norwegian University of Technology and Science (NTNU), presenting Practical q-IND-CPA-D-Secure Approximate Homomorphic Encryption.
For more information and link to RSVP, see the event page at https://fhe.org/meetups/056.
Abstract
At Eurocrypt 2021 Li and Micciancio presented a passive key recovery attack on CKKS, leveraging its approximate nature. They proposed a new security notion for approximate homomorphic encryption schemes: q-IND-CPA-D security. In their initial work they left achieving q-IND-CPA-D security for CKKS as an open problem, but they proposed two approaches: noise flooding and exact CKKS. This work addresses the latter approach: a truncated version of CKKS is proposed, where the bits polluted by the error are rounded off. It is shown that thus it is possible to achieve q-IND-CPA-D security for this truncated CKKS without too much loss in efficiency.
About the speaker
Lea is a third year PhD student at the Norwegian University of Technology and Science (NTNU). Her main research area is Fully Homomorphic Encryption.
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