Hervé Talé Kalachi

Talks and Presentations

Keynote

Protecting Tomorrow's Cameroonian Cyberspace: Building Digital Trust in the Post-Quantum Era

• Keynote at Work-GMC 2026, University of Dschang, Cameroon (15 April 2026). The talk discussed digital trust, cybersecurity governance, Cameroon’s regulatory framework, and the transition toward post-quantum cryptography. Download slides

Decoding in the Rank Metric: from Finite Fields to Finite Rings

• Presentation at the ETIS-ICI Seminar, CY Cergy Paris University, France (May 7, 2025). Download slides

On the Generalizations of the Rank Metric over Finite Chain Rings

• 15th International Conference on Cryptology (AFRICACRYPT 2024), Douala, Cameroon (10–12 July 2024). Conference Website. Download slides

Code-Based Cryptography

• CIMPA School on Algebra, Algebraic Geometry and Applications to Information Theory (CIMPA Douala), University of Douala, Cameroon (15–26 July 2024).

New Direction for Rank-Based Cryptography

• Presentation at the LAAGA Seminar, Cheikh Anta Diop University, Dakar, Senegal (April 2023). Download slides

On the Failure of the Smart Approach of the GPT Cryptosystem

• Online presentation at the AFRIMath Seminar on Number Theory and Information Theory (25 June 2021). Download slides

Rank-Metric Cryptography

• Day event at ARCOCRYPT, Université de Rouen-Normandie, France (7 November 2019).

On the security of some variants of the GPT Cryptosystem

• Presentation at the ARIC team seminar, ENS de Lyon, France (9 May 2019).

On the Security of some Cryptosystems Based on Gabidulin Codes

• 6th Annual Workshop on Cryptography, Algebra and Geometry (CRAG-6), University of Bamenda, Cameroon (15–17 June 2016).
• Presentation at the AIMS Seminar, Cameroon (3 April 2018). Download slides

Introduction to Code-Based Cryptography

• EMA School (EMA), University of Yaoundé I, Cameroon (16–28 July 2018).

Around the Faure-Loidreau Cryptosystem

• Presentation at the ERAL Seminar, University of Yaoundé I, Cameroon (21 June 2018).

Improved Cryptanalysis of Rank Metric Schemes Based on Gabidulin Codes

• Séminaire de Cryptographie, Université de Rennes 1, France (3 February 2017). Download slides
• GREYC Seminar, Université de Caen, France (30 March 2016). Download slides

Security of Cryptographic Protocols Based on Coding Theory

• Seminar of the C&A Team, LITIS, Université de Rouen-Normandie, France (2 December 2016).
• Doctoriales des Sciences Mathématiques, ENS de Yaoundé, Cameroon (December 2015).

Example of Structural Attack in Code-Based Cryptography

• Workshop on Cryptography, Coding and Applications, Université Marien Ngouabi, Brazzaville, Congo (14–18 December 2015).

The Overbeck's Attack

• Workshop on Number Theory, Coding and Post-Quantum Cryptography, Cheikh Anta Diop University, Dakar, Senegal (3–11 December 2015).

Square Codes Attack on a Modified Sidelnikov Cryptosystem

• International Conference in Codes, Cryptology and Information Security (C2SI-2015), Rabat, Morocco (26–28 May 2015). Download slides
• Journée des doctorants des équipes C&A et TIBS du LITIS, Université de Rouen-Normandie, France (25 June 2015). Download slides

On the use of Random Redundancy in Code-Based Public-Key Cryptography

• 4th Annual Workshop on Cryptography, Algebra and Geometry (CRAG-4), University of Dschang, Cameroon (21–25 July 2014).
• École Jeunes Chercheu/r/se/s en Informatique Mathématique (EJCIM-2015), Université d’Orléans, France (30 March – 3 April 2015).

Cryptanalysis of a Modified Sidelnikov Cryptosystem

• CIMPA Research School, AIMS-Senegal, Senegal (16–29 June 2014).

Code-Based Cryptography

• Doctoriales des Sciences Mathématiques, ENS de Yaoundé, Cameroon (December 2014).

Dyadic Version of the McEliece Cryptosystem

• 2nd Annual Workshop on Cryptography, Algebra and Geometry (CRAG-2), University of Ngaoundéré, Cameroon (4 December 2012).