[crypto] Fwd: REMINDER: Crypto Working Group, February 7, 2020, DIFFERENT LOCATION

[R. Hirschfeld]

-------- Original Message --------
Subject: REMINDER: Crypto Working Group, February 7, 2020, DIFFERENT 
LOCATION
Date: 2020-02-05 10:08
 From: Secretariaat DM <secdm at tue.nl>
To: Secretariaat DM <secdm at tue.nl>

Dear all,

Herewith I send you a reminder for the CWG-meeting this Friday, February 
7, 2020.

With kind regards, / Met vriendelijke groeten,
Anita Klooster
secretary of the section Discrete Mathematics
  [cid:image001.png at 01D4442F.81AF2D80]
Dept. of Mathematics and Computer Science
MF 6.101
Office hours: Monday and Wednesday 08.30-17.00 h / Friday 08.30-12.30 h
Tel.: +31 (0)40 2472254




CRYPTO WORKING GROUP


Friday, February 7, 2020
Opleidingsruimte-Utrecht 
(http://opleidingsruimte-utrecht.nl/Routebeschrijving-Mariaplaats-3.pdf)
                                                 Mariaplaats 3, Utrecht



Program


10.45 – 11.30 hrs.                                            Aldo 
Gunsing (RU Nijmegen),

                                                                          
                              Deck-Based Wide Block Cipher Modes and an 
Exposition of the Blinded Keyed Hashing Model


11.30 -  11.45 hrs.                                            Coffee / 
tea break


11.45 - 12.30 hrs.                                             Douglas 
Stebila (Univ. of Waterloo, Canada),

                                                                          
                              Exploring Post-Quantum Cryptography in 
Internet Protocols


12.30 -  14.00 hrs.                                            Lunch 
break (lunch not included)


14.00 - 14.45 hrs.                                             Florian 
Hahn (Univ. of Twente),

                                                                          
                              Secure Data Aggregation Grouped by Multiple 
Attributes


14.45 - 15.00 hrs.                                             Coffee / 
tea break


15.00 - 15.45 hrs.                                             Tomer 
Ashur (TU Eindhoven),

                                                                          
                              Design of Symmetric-Key Primitives for 
Advanced Cryptographic Protocols


Abstract talk Aldo Gunsing: Deck-Based Wide Block Cipher Modes and an 
Exposition of the Blinded Keyed Hashing Model

We present two tweakable wide block cipher modes from doubly-extendable 
cryptographic keyed (deck) functions and a keyed hash function: 
double-decker and docked-double-decker. Double-decker is a direct 
generalization of Farfalle-WBC of Bertoni et al. (ToSC 2017(4)), and is 
a four-round Feistel network, docked-double-decker is a modified 
variant. We prove these constructions secure using a new security model 
for keyed hashes namely the blinded keyed hashing model. We demonstrate 
that blinded keyed hashing is more general than the conventional notion 
of XOR-universality, and that it allows us to instantiate our 
constructions with keyed hash functions that have a very strong claim on 
bkh security but not necessarily on XOR-universality, such as Xoofffie 
(ePrint 2018/767).



Abstract talk Douglas Stebila: Exploring Post-Quantum Cryptography in 
Internet Protocols
Post-quantum cryptographic primitives have a range of trade-offs 
compared to traditional public key algorithms, either having slower 
computation or larger public keys and ciphertexts/signatures, or both. 
In this talk, I will discuss how these trade-offs may impact various 
Internet security protocols, focusing primarily on the Transport Layer 
Security (TLS) protocol as a case study.
First, I will discuss the various choices one must make at the protocol 
specification level when deciding how to integrate post-quantum 
algorithms into network security protocols, with special consideration 
of the so-called hybrid or combined scenario, where a traditional and 
post-quantum algorithm are used simultaneously to provide robust 
security. Next, I will talk about our experience with prototype 
implementations of post-quantum and hybrid algorithms in the TLS and the 
Secure Shell (SSH) protocols, including whether particular algorithms 
even can be used due to size constraints.  Building on this, I will 
present results on the performance impact of post-quantum algorithms, 
showing how network characteristics such as round-trip time and packet 
loss rate affect connection establishment time. Finally, I'll briefly 
discuss some open questions both from an engineering and theory 
perspective.
Along the way I'll discuss the Open Quantum Safe project, an open-source 
software project for prototyping and experimenting with post-quantum 
cryptography.

Abstract talk Tomer Ashur: Design of Symmetric-Key Primitives for 
Advanced Cryptographic Protocols
While traditional symmetric primitives like AES and SHA3 are optimized 
for efficient hardware and software implementations, a range of emerging 
applications using advanced cryptographic protocols such as multi-party 
computation and zero-knowledge proofs require optimization with respect 
to a different metric: arithmetic complexity. In this paper we study the 
design of secure cryptographic primitives optimized to minimize this 
metric. We begin by identifying the differences in the design space 
between such arithmetization-oriented ciphers and traditional ones, with 
particular emphasis on the available tools, efficiency metrics, and 
relevant cryptanalysis. This discussion highlights a crucial point --- 
the considerations for designing arithmetization-oriented ciphers are 
fundamentally different from the considerations arising from traditional 
cipher design.

The natural next step is to identify sound principles to securely 
navigate this new terrain, and to materialize these principles into 
concrete designs. To this end, we present two families of 
arithmetization-oriented symmetric-key primitives. By motivating our 
design decisions at length with respect to the identified principles, we 
show that it is possible to design secure and efficient primitives for 
this emerging domain.