Category: QualSec seminars

Apr 24

Seminar: Rajeev Anand Sahu “Designated Verifier Blind Signature from Supersingular Isogeny” (Apr 25, 2018)

Apr 25, 2018 – 12.30 – room P.2NO8.08

Speaker: Rajeev Anand Sahu (ULB)

Title: “Designated Verifier Blind Signature from Supersingular Isogeny”
Short abstract: “Isogeny-based cryptography has recently attracted researchers as a candidate post-quantum cryptography. The first digital signature on this platform was presented by Jao and Soukharev in 2014, which is an Undeniable Signature. Currently, Srinath and Chandrasekaran have constructed Undeniable Blind Signature to provide signer’s control on the verification. Their structure involves communication overhead and the basic issues of undeniable signature. In this work, we attempt to propose a scheme of Isogeny-Based Blind Signature with requester’s control over the verification, by the means of Designated Verifier Signature.”

Apr 18

ULB Computer Science Distinguished Lecture

Prof. Joan Daemen 

April 26, 2018 at 1:30pm – ULB Plaine – Building NO – 5th floor – Solvay Room 

Column-parity mixing layers in cryptography

Mixing layers, such as MixColumns in the AES, are an essential ingredient that can be found in the round function of most modern block ciphers and permutations. We study a generalization of the mixing layer in Keccak-f, the permutation underlying the NIST standard SHA-3 and the authenticated encryption schemes Keyak and Ketje. We call this generalization column-parity mixing layers and investigate their algebraic and diffusion properties and implementation cost. We demonstrate their competitiveness by presenting a fully specified 256-bit permutation with strong bounds for differential and linear trails.

The speaker is hosted by the QualSec Research Group

Apr 12

Seminar: Bojan Spasic “Searchable Symmetric Encryption” (Apr 18, 2018)

Apr 18, 2018 – 12.30 – room P.2NO8.08

Speaker: Bojan Spasic (ULB)

Title: “Searchable Symmetric Encryption”
Short abstract: “Searchable Symmetric Encryption (SSE) has received a lot of research attention recently. To date, SSE schemes seem to provide the best tradeoffs between efficiency and security among different encrypted search solutions (e.g. property-preserving encryption, fully-homomorphic encryption, ORAM, functional encryption). Informally, SSE schemes encrypt a search structure which is outsourced to an untrusted server (e.g. in the cloud) together with the corresponding encrypted data collection. SSE enables clients to privately query the search structure in order to retrieve matching documents from the data collection. SSE has been studied in different security models and tradeoffs between security, efficiency and query expressiveness have been explored.”

Mar 12

Seminar: François Gerard “BLISS: Bimodal Lattice Signature Scheme” (Mar 14, 2018)

Mar 14, 2018 – 12.30 – room P.2NO8.08

Speaker: François Gerard (ULB)

Title: “BLISS: Bimodal Lattice Signature Scheme”
Short abstract: “In 2009, Lyubashevsky proposed the first provably secure lattice-based signature using the Fiat-Shamir paradigm. It’s security depends on a rejection step during the signature procedure. For this rejection sampling technique to be efficient, one must use a large distribution for the nonce resulting in large signatures. A few years later, Ducas and al. proposed a new scheme called BLISS optimizing this crucial step of rejection to decrease the overall size of the signature.”

Mar 06

Seminar: Helena Bruyninckx “Quantum Authentication (&Quantum Encryption)” (Mar 07, 2018)

Mar 07, 2018 – 12.30 – room P.A2.220

Speaker: Helena Bruyninckx (ULB)

Title: “Quantum Authentication (&Quantum Encryption)”

Feb 21

Seminar: Dimitrios Sisiaridis “Security Analytics: Reducing Data Complexity with Apache Spark – aggregating features and data transformation” (Feb 07, 2018)

Feb 07, 2018 – 12.30 – room P.A2.220

Speaker: Dimitrios Sisiaridis (ULB)

Title: “Security Analytics: Reducing Data Complexity with Apache Spark – aggregating features and data transformation”

Jan 09

Seminar: Tania Ellinidou “An SDN solution for System-on-Chip world.” (Jan 16, 2018)

Jan 16, 2018 – 12.30 – room P.A2.220

Speaker: Tania Ellinidou (ULB)

Title: “An SDN solution for System-on-Chip world.”

Nov 21

Seminar: Veronika Kuchta “Constrained Verifiable Random Functions and their Applications to Non-Interactive Verifiable Identity-Based Key-Exchange Protocol” (Nov 22, 2017)

Nov 22, 2017 – 12.30 – room 2NO7.07

Speaker:  Veronika Kuchta (ULB)

Title: “Constrained Verifiable Random Functions and their Applications to Non-Interactive Verifiable Identity-Based Key-Exchange Protocol”

Nov 13

Seminar: Gaurav Sharma “Authenticated Group Key Agreement” (Nov 15, 2017)

Nov 15, 2017 – 12.30 – room 2NO7.07

Speaker: Gaurav Sharma (ULB)

Title: “Authenticated Group Key Agreement”

Oct 24

Seminar: Rajeev Anand Sahu “Introduction to Isogeny-Based Cryptography (A New Candidate PQ Crypto)” (Oct 25, 2017)

Oct 25, 2017 – 12.30 – room 2NO7.07

Speaker: Rajeev Anand Sahu (ULB)

Title: “Introduction to Isogeny-Based Cryptography (A New Candidate PQ Crypto)”