36 min listen
Episode 20: Cryptanalysis of GPRS: GEA-1 and GEA-2!
FromCryptography FM
ratings:
Length:
43 minutes
Released:
Jul 20, 2021
Format:
Podcast episode
Description
A team of cryptanalysits presents the first publicly available cryptanalytic attacks on the GEA-1 and GEA-2 algorithms. Instead of providing full 64-bit security, they show that the initial state of GEA-1 can be recovered from as little as 65 bits of known keystream (with at least 24 bits coming from one frame) in time 240 GEA-1 evaluations and using 44.5 GiB of memory. The attack on GEA-1 is based on an exceptional interaction of the deployed LFSRs and the key initialization, which is highly unlikely to occur by chance. This unusual pattern indicates that the weakness is intentionally hidden to limit the security level to 40 bit by design.
Cryptanalysis of the GPRS Encryption Algorithms GEA-1 and GEA-2 (https://eprint.iacr.org/2021/819)
Music composed by Toby Fox and performed by Sean Schafianski (https://seanschafianski.bandcamp.com/). Special Guests: Gaëtan Leurent and Håvard Raddum.
Cryptanalysis of the GPRS Encryption Algorithms GEA-1 and GEA-2 (https://eprint.iacr.org/2021/819)
Music composed by Toby Fox and performed by Sean Schafianski (https://seanschafianski.bandcamp.com/). Special Guests: Gaëtan Leurent and Håvard Raddum.
Released:
Jul 20, 2021
Format:
Podcast episode
Titles in the series (24)
Episode 1: Post-Quantum TLS With KEMs Instead of Signatures!: KEMTLS is a modified version of TLS 1.3 that uses Key Encapsulation Mechanisms, or KEMs, instead of signatures for server authentication, thereby providing a sort of “post-quantum TLS”. But what even are KEMs? Are quantum computers even a thing that we should be worried about? On the first ever episode of Cryptography FM, we’ll be hosting Dr. Douglas Stebila and PhD Candidate Thom Wiggers to discuss these questions and more. by Cryptography FM