Welcome to the resource topic for 2017/906
Title:
Notes On GGH13 Without The Presence Of Ideals
Authors: Martin R. Albrecht, Alex Davidson, Enrique Larraia, Alice Pellet--Mary
Abstract:We investigate the merits of altering the Garg, Gentry and Halevi (GGH13) graded encoding scheme to remove the presence of the ideal (\langle g \rangle). In particular, we show that we can alter the form of encodings so that effectively a new (g_i) is used for each source group (\mathbb{G}_i), while retaining correctness. This would appear to prevent all known attacks on indistinguishability obfuscation (IO) candidates instantiated using GGH13. However, when analysing security in simplified branching program and obfuscation security models, we present branching program (and thus IO) distinguishing attacks that do not use knowledge of (\langle g \rangle). This result opens a counterpoint with the work of Halevi (EPRINT 2015) which stated that the core computational hardness problem underpinning GGH13 is computing a basis of this ideal. Our attempts seem to suggest that there is a structural vulnerability in the way that GGH13 encodings are constructed that lies deeper than the presence of (\langle g \rangle).
ePrint: https://eprint.iacr.org/2017/906
See all topics related to this paper.
Feel free to post resources that are related to this paper below.
Example resources include: implementations, explanation materials, talks, slides, links to previous discussions on other websites.
For more information, see the rules for Resource Topics .