1 / 4

On Parallel and Concurrent Security of HB and HB +

On Parallel and Concurrent Security of HB and HB +. Jonathan Katz and Ji-Sun Shin University of Maryland. Motivation. Juels and Weis analyze and propose the HB and HB + protocols (tomorrow) Building on prior work of Hopper-Blum

naava
Download Presentation

On Parallel and Concurrent Security of HB and HB +

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. On Parallel and Concurrent Security of HB and HB+ Jonathan Katz and Ji-Sun Shin University of Maryland

  2. Motivation • Juels and Weis analyze and propose the HB and HB+ protocols (tomorrow) • Building on prior work of Hopper-Blum • HB: secure against passive adversaryHB+: secure against active adversary • They are extremely efficient • Suitable for low-power devices

  3. But… • Juels-Weis analyze “basic”, two-round protocols with soundness ½ • Then claim security under sequential repetition • Yields protocols with O(k) rounds! • Also, no security under concurrent executions…

  4. Our Results • Using recent results of Regev (STOC ’05), we prove security of HB/HB+ under concurrent executions • HB/HB+ can be “collapsed” to only 2-3 rounds! • We believe our approach also greatly simplifies the proofs…

More Related