Christian Johansen

About

See my homepage https://christian.johansenresearch.info/

Do you want to be a Teaching Assistant (TA) this autumn semester in one of the courses IMT4123 or IIKG2001 ? Send me an e-mail!

I am head of the Systems Security group, which we just call S2G, and am part of the CCIS (Center for Cyber and Information Security), the Norwegian Cyber Range, and the S2G Playground.

I work in Security and Theoretical Computer Science focusing on developing and using formal methods and tools for ensuring reliability of complex systems, including properties regarding security, safety, and concurrency. Applications of such methods are numerous, e.g., verification of safety properties of software systems (like absence of certain bugs) or of cyber-physical systems like the Smart Grids, ensuring security of Internet of Things, or modelling the concurrency of modern multi-core or high-performance computing. Among methods or models that I have created I can list: the Timed Distributed pi-calculus, the ST-structures, the Dynamic Structural Operational Semantics, the Synchronous Kleene Algebra, or the Higher Dimensional Modal Logic. Together with my students I have worked on developing tools, e.g., together with Manish Shrestha we made the LightSC Security Classification Method for Smart Grids and IoT and the associated usable security tool with the same name; whereas together with Bjørnar Luteberget we made the SAT modulo Discrete Event Simulation method and tool applied to railway capacity verification. A nice and long collaboration with Tore Pedersen has taken me also into the realm of modelling of human behaviour, where some of my contributions are: proposing the Behavioural Computer Science agenda, where models of human behaviour are combined with CS models of system behaviour (execution); or the probabilistic modelling of humans in security ceremonies.

I have done research in different areas of computer science, including modelling of security protocols; (object-oriented) programming languages and their formal semantics; modelling languages and verification of distributed and networked systems; models and tools for parallel programming and concurrent systems; algebras and logics as used in computer science; timed process calculi for distributed and mobile communicating systems; (legal) electronic contracts and privacy agreements (ToS -- Terms of Services). My work, more than 60 international articles, has been published in highly ranked conferences s.a. CONCUR, ATVA, LFCS, FM, POST, or CCS, and top journals s.a. JLAMP, IJCIP, FMSD, or LMCS. More recent works usually target concurrency, security, and privacy. I finished my doctoral studies in 2010 at University of Oslo and have been involved ever since in teaching and supervision, in reviewing for international conferences and journals, in the organisation of conferences and workshops, and in the coordination and writing of projects submitted to highly competitive calls, s.a.: EU-FP7-FET-Young-Explorers, Horison-2020, NFR-FRINATEK, UK’s EPSRC, ECSEL-JU.

Research

I have done research in different areas of computer science, including modelling of security protocols; (object-oriented) programming languages and their formal semantics; modelling languages and verification of networked systems; models and tools for parallel programming and concurrent systems; algebras and logics as used in computer science; timed process calculi for distributed and mobile communicating systems; (legal) electronic contracts and privacy agreements (ToS -- Terms of Services). My work, more than 45 international articles, has been published in highly ranked conferences s.a. CONCUR, ATVA, LFCS, FM, POST, or CCS, and top journals s.a. JLAMP, IJCIP, FMSD, or LMCS. More recent works usually target concurrency, security, and privacy. I finished my doctoral studies in 2010 at University of Oslo and have been involved ever since in teaching and supervision, in reviewing for international conferences and journals, in the organisation of conferences and workshops, and in the coordination and writing of projects submitted to highly competitive calls, s.a.: EU-FP7-FET-Young-Explorers, Horison-2020, NFR-FRINATEK, UK’s EPSRC, ECSEL-JU.

Systems Security Group (S2G)

Publications

2025

Szalkowski, Gabriel Andy; Windekilde, Iwona Maria; Johansen, Christian. (2025) Towards sustainable short-form video: Modelling solutions for social and environmental challenges. F1000 Research
Academic article
Szalkowski, Gabriel Andy; Johansen, Christian. (2025) Evidence of diseconomies of scale in subscription-based video on demand services: The case of Netflix. IEEE Access
Academic article

2024

Arshad, Hamed; Horne, Ross; Johansen, Christian; Owe, Olaf; Willemse, Tim A.C.. (2024) XACML2mCRL2: Automatic transformation of XACML policies into mCRL2 specifications[Formula presented]. Science of Computer Programming
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2024) KLEENE THEOREM FOR HIGHER-DIMENSIONAL AUTOMATA. Logical Methods in Computer Science
Academic article

2023

Arshad, Hamed; Picazo Sanchez, Pablo; Johansen, Christian; Schneider, Gerardo. (2023) Attribute-based encryption with enforceable obligations. Journal of Cryptographic Engineering (JCEN)
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2023) Catoids and modal convolution algebras. Algebra Universalis
Academic article
Szalkowski, Gabriel Andy; Johansen, Christian. (2023) Defining and measuring the effects of digital technologies on social sustainability: A systematic literature review. Sustainable Development
Academic literature review

2022

Aubert, Clement; Horne, Ross; Johansen, Christian. (2022) Diamonds for Security: A Non-Interleaving Operational Semantics for the Applied Pi-Calculus. Leibniz International Proceedings in Informatics
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) A Kleene Theorem for Higher-Dimensional Automata. Leibniz International Proceedings in Informatics
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) Domain Semirings United. Acta Cybernetica
Academic article
Arshad, Hamed; Johansen, Christian; Owe, Olaf; Picazo-Sanchez, Pablo ; Schneider, Gerardo. (2022) Semantic Attribute-Based Encryption: A framework for combining ABE schemes with semantic technologies. Information Sciences
Academic article
Arshad, Hamed; Horne, Ross; Johansen, Christian; Owe, Olaf; Willemse, Tim A. C.. (2022) Process Algebra Can Save Lives: Static Analysis of XACML Access Control Policies Using mCRL2. Springer
Academic chapter/article/Conference paper
Arshad, Hamed; Johansen, Christian; Owe, Olaf. (2022) Semantic Attribute-Based Access Control: A review on current status and future perspectives. Journal of systems architecture
Academic literature review
Aubert, Clement; Horne, Ross; Johansen, Christian. (2022) Bisimulations Respecting Duration and Causality for the Non-interleaving Applied Pi-Calculus. Electronic Proceedings in Theoretical Computer Science (EPTCS)
Academic article
Johansen, Johanna; Pedersen, Tore; Fischer-Hübner, Simone; Johansen, Christian; Schneider, Gerardo; Roosendaal, Arnold. (2022) A multidisciplinary definition of privacy labels. Information and Computer Security
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) Posets with interfaces as a model for concurrency. Information and Computation
Academic article

2021

Ramezanifarkhani, Toktam; Fazeldehkordi, Elahe; Owe, Olaf; Noll, Josef; Johansen, Christian. (2021) Security and Privacy Solutions in IoT and Distributed Systems Design. Faculty of Mathematics and Natural Sciences, UiO
Doctoral dissertation
Luteberget, Bjørnar Steinnes; Claessen, Koen; Johansen, Christian; Steffen, Martin. (2021) SAT modulo discrete event simulation applied to railway design capacity analysis. Formal methods in system design
Academic article
Johansen, Johanna; Noll, Josef; Johansen, Christian. (2021) InfoInternet for education in the Global South: A study of applications enabled by free information-only internet access in technologically disadvantaged areas. African Journal of Science, Technology, Innovation and Development (AJSTID)
Academic article
Fahrenberg, Uli; Johansen, Christian; Trotter, Christopher A.; Ziemiański, Krzysztof. (2021) Sculptures in concurrency. Logical Methods in Computer Science
Academic article
Johansen, Johanna; Pedersen, Tore; Johansen, Christian. (2021) Studying human-to-computer bias transference. AI & Society: Knowledge, Culture and Communication
Academic article
Luteberget, Bjørnar Steinnes; Johansen, Christian. (2021) Drawing with SAT: four methods and A tool for producing railway infrastructure schematics. Formal Aspects of Computing
Academic article
Johansen, Christian; Aulon, Mujaj; Arshad, Hamed; Noll, Josef. (2021) The Snowden Phone: A Comparative Survey of Secure Instant Messaging Mobile Applications . Security and Communication Networks
Academic literature review
Calk, Cameron; Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2021) lr-Multisemigroups, Modal Quantales and the Origin of Locality. Lecture Notes in Computer Science (LNCS)
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2021) Languages of higher-dimensional automata. Mathematical Structures in Computer Science
Academic article

2020

Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Thapa, Ratan Bahadur. (2020) Generating Posets Beyond N. Lecture Notes in Computer Science (LNCS)
Academic article
Shrestha, Manish; Johansen, Christian; Noll, Josef; Roverso, Davide. (2020) A Methodology for Security Classification applied to Smart Grid Infrastructures. International Journal of Critical Infrastructure Protection
Academic article
Tokas, Shukun; Owe, Olaf; Johansen, Christian. (2020) Code Diversification Mechanisms for Internet of Things (Revised Version 2). Universitetet i Oslo Universitetet i Oslo
Report
Shrestha, Manish; Johansen, Christian; Noll, Josef. (2020) Building Confidence using Beliefs and Arguments in Security Class Evaluations for IoT (long version). Universitetet i Oslo Universitetet i Oslo
Report
Shrestha, Manish; Johansen, Christian; Moghadam, Maunya D.; Johansen, Johanna; Noll, Josef. (2020) Tool Support for Security Classification for Internet of Things (long version). Universitetet i Oslo Universitetet i Oslo
Report

2019

Luteberget, Bjørnar Steinnes; Claessen, Koen; Johansen, Christian. (2019) Automated Drawing of Railway Schematics Using Numerical Optimization in SAT. Lecture Notes in Computer Science (LNCS)
Academic article
Luteberget, Bjørnar; Johansen, Christian; Steffen, Martin. (2019) Synthesis of railway signaling layout from local capacity specifications. Lecture Notes in Computer Science (LNCS)
Academic article
Johansen, Christian; Owe, Olaf. (2019) Dynamic Structural Operational Semantics. Journal of Logical and Algebraic Methods in Programming
Academic article
Shrestha, Manish; Johansen, Christian; Noll, Josef. (2019) Criteria for Security Classification of Smart Home Energy Management Systems (long version). Universitetet i Oslo Universitetet i Oslo
Report
Hildebrandt, Thomas; Johansen, Christian; Norman, Håkon. (2019) A stable non-interleaving early operational semantics for the pi-calculus. Journal of Logical and Algebraic Methods in Programming
Academic article
Pedersen, Tore; Johansen, Christian. (2019) Behavioural artificial intelligence: an agenda for systematic empirical studies of artificial inference. AI & Society: Knowledge, Culture and Communication
Academic article
Johansen, Christian; Owe, Olaf. (2019) Summary of: Dynamic Structural Operational Semantics. Lecture Notes in Computer Science (LNCS)
Academic article

2018

Pedersen, Tore; Johansen, Christian; Jøsang, Audun. (2018) Behavioural Computer Science: an agenda for combining modelling of human and system behaviours. Human-centric Computing and Information Sciences
Academic article
Noll, Josef; Garitano, Iñaki; Johansen, Christian; Del Ser, Javier; Arenaza-Nuno, Ignacio. (2018) Perspectives in Secure SMART Environments. CRC Press
Academic chapter/article/Conference paper

2017

Luteberget, Bjørnar Steinnes; Johansen, Christian. (2017) Efficient verification of railway infrastructure designs against standard regulations. Formal methods in system design
Academic article
Tokas, Shukun; Owe, Olaf; Johansen, Christian. (2017) Code Diversification Mechanisms for Securing the Internet of Things.
Academic chapter/article/Conference paper
Bursuc, Sergiu; Johansen, Christian; Xu, Shiwei. (2017) Automated verification of dynamic root of trust protocols. Lecture Notes in Computer Science (LNCS)
Academic article
Hildebrandt, Thomas; Johansen, Christian; Normann, Håkon. (2017) A stable non-interleaving early operational semantics for the Pi-calculus. Lecture Notes in Computer Science (LNCS)
Academic article
Luteberget, Bjørnar Steinnes; Camilleri, John J.; Johansen, Christian; Schneider, Gerardo. (2017) Participatory Verification of Railway Infrastructure Regulations using RailCNL (long version). Universitetet i Oslo Universitetet i Oslo
Report
Johansen, Christian; Mujaj, Aulon; Arshad, Hamed; Noll, Josef. (2017) Comparing Implementations of Secure Messaging Protocols (long version). Universitetet i Oslo Universitetet i Oslo
Report
Shrestha, Manish; Johansen, Christian; Noll, Josef. (2017) Security Classification for Smart Grid Infra structures (long version). Universitetet i Oslo Universitetet i Oslo
Report
Luteberget, Bjørnar Steinnes; Camilleri, John J.; Johansen, Christian; Schneider, Gerardo. (2017) Participatory verification of railway infrastructure by representing regulations in RailCNL. Lecture Notes in Computer Science (LNCS)
Academic article

2016

Johansen, Christian; Jøsang, Audun; Migdal, Denis. (2016) Usable Authentication with an Offline Trusted Device Proxy Architecture (long version). Universitetet i Oslo Universitetet i Oslo
Report
Johansen, Christian; Jøsang, Audun; Migdal, Denis. (2016) Offpad: Offline personal authenticating device: implementations and applications. Universitetet i Oslo Universitetet i Oslo
Report
Luteberget, Bjørnar Steinnes; Johansen, Christian; Steffen, Martin. (2016) Rule-based consistency checking of railway infrastructure designs. Lecture Notes in Computer Science (LNCS)
Academic article
Luteberget, Bjørnar Steinnes; Johansen, Christian; Feyling, C; Steffen, Martin. (2016) Rule-based incremental verification tools applied to railway designs and regulations. Lecture Notes in Computer Science (LNCS)
Academic article
Johansen, Christian; Pedersen, Tore; Jøsang, Audun. (2016) Reflections on Behavioural Computer Science. Universitetet i Oslo Universitetet i Oslo
Report
Johansen, Christian; Norman, Håkon; Hildebrandt, Thomas. (2016) Non-interleaving Operational Semantics for the Pi-calculus -- technicalities. Universitetet i Oslo Universitetet i Oslo
Report
Luteberget, Bjørnar Steinnes; Johansen, Christian; Steffen, Martin. (2016) Rule-Based Consistency Checking of Railway Infrastructure Designs. Universitetet i Oslo Conference proceedings (Universitetet i Oslo. Institutt for informatikk) (450)
Report
Normann, Håkon; Johansen, Christian; Hildebrandt, Thomas. (2016) Declarative event based models of concurrency and refinement in psi-calculi. Journal of Logical and Algebraic Methods in Programming
Academic article
Migdal, Denis; Johansen, Christian; Jøsang, Audun. (2016) DEMO: OffPAD - Offline Personal Authenticating Device with Applications in Hospitals and e-Banking. Association for Computing Machinery (ACM)
Chapter
Johansen, Christian. (2016) ST-structures. Journal of Logical and Algebraic Methods in Programming
Academic article
Johansen, Christian; Pedersen, Tore; Jøsang, Audun. (2016) Towards Behavioural Computer Science. IFIP Advances in Information and Communication Technology
Academic article

2015

Taherkordi, Amirhosein; Johansen, Christian; Eliassen, Frank; Römer, Kay. (2015) Tokenit: Designing State-Driven Embedded Systems through Tokenized Transitions. IEEE (Institute of Electrical and Electronics Engineers)
Academic chapter/article/Conference paper
Johansen, Christian; Jøsang, Audun. (2015) Probabilistic Modeling of Humans in Security Ceremonies. Springer Publishing Company
Academic chapter/article/Conference paper
Johansen, Christian; Jøsang, Audun. (2015) Probabilistic modelling of humans in security ceremonies. Lecture Notes in Computer Science (LNCS)
Academic article

2014

Johansen, Christian. (2014) Actor network procedures as Psi-calculi for security ceremonies. Electronic Proceedings in Theoretical Computer Science (EPTCS)
Academic article
Normann, Håkon; Johansen, Christian; Hildebrandt, Thomas. (2014) Concurrency models with causality and events as psi-calculi. Electronic Proceedings in Theoretical Computer Science (EPTCS)
Academic article

Journal publications

Szalkowski, Gabriel Andy; Windekilde, Iwona Maria; Johansen, Christian. (2025) Towards sustainable short-form video: Modelling solutions for social and environmental challenges. F1000 Research
Academic article
Szalkowski, Gabriel Andy; Johansen, Christian. (2025) Evidence of diseconomies of scale in subscription-based video on demand services: The case of Netflix. IEEE Access
Academic article
Arshad, Hamed; Horne, Ross; Johansen, Christian; Owe, Olaf; Willemse, Tim A.C.. (2024) XACML2mCRL2: Automatic transformation of XACML policies into mCRL2 specifications[Formula presented]. Science of Computer Programming
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2024) KLEENE THEOREM FOR HIGHER-DIMENSIONAL AUTOMATA. Logical Methods in Computer Science
Academic article
Arshad, Hamed; Picazo Sanchez, Pablo; Johansen, Christian; Schneider, Gerardo. (2023) Attribute-based encryption with enforceable obligations. Journal of Cryptographic Engineering (JCEN)
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2023) Catoids and modal convolution algebras. Algebra Universalis
Academic article
Szalkowski, Gabriel Andy; Johansen, Christian. (2023) Defining and measuring the effects of digital technologies on social sustainability: A systematic literature review. Sustainable Development
Academic literature review
Aubert, Clement; Horne, Ross; Johansen, Christian. (2022) Diamonds for Security: A Non-Interleaving Operational Semantics for the Applied Pi-Calculus. Leibniz International Proceedings in Informatics
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) A Kleene Theorem for Higher-Dimensional Automata. Leibniz International Proceedings in Informatics
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) Domain Semirings United. Acta Cybernetica
Academic article
Arshad, Hamed; Johansen, Christian; Owe, Olaf; Picazo-Sanchez, Pablo ; Schneider, Gerardo. (2022) Semantic Attribute-Based Encryption: A framework for combining ABE schemes with semantic technologies. Information Sciences
Academic article
Arshad, Hamed; Johansen, Christian; Owe, Olaf. (2022) Semantic Attribute-Based Access Control: A review on current status and future perspectives. Journal of systems architecture
Academic literature review
Aubert, Clement; Horne, Ross; Johansen, Christian. (2022) Bisimulations Respecting Duration and Causality for the Non-interleaving Applied Pi-Calculus. Electronic Proceedings in Theoretical Computer Science (EPTCS)
Academic article
Johansen, Johanna; Pedersen, Tore; Fischer-Hübner, Simone; Johansen, Christian; Schneider, Gerardo; Roosendaal, Arnold. (2022) A multidisciplinary definition of privacy labels. Information and Computer Security
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) Posets with interfaces as a model for concurrency. Information and Computation
Academic article
Luteberget, Bjørnar Steinnes; Claessen, Koen; Johansen, Christian; Steffen, Martin. (2021) SAT modulo discrete event simulation applied to railway design capacity analysis. Formal methods in system design
Academic article
Johansen, Johanna; Noll, Josef; Johansen, Christian. (2021) InfoInternet for education in the Global South: A study of applications enabled by free information-only internet access in technologically disadvantaged areas. African Journal of Science, Technology, Innovation and Development (AJSTID)
Academic article
Fahrenberg, Uli; Johansen, Christian; Trotter, Christopher A.; Ziemiański, Krzysztof. (2021) Sculptures in concurrency. Logical Methods in Computer Science
Academic article
Johansen, Johanna; Pedersen, Tore; Johansen, Christian. (2021) Studying human-to-computer bias transference. AI & Society: Knowledge, Culture and Communication
Academic article
Luteberget, Bjørnar Steinnes; Johansen, Christian. (2021) Drawing with SAT: four methods and A tool for producing railway infrastructure schematics. Formal Aspects of Computing
Academic article
Johansen, Christian; Aulon, Mujaj; Arshad, Hamed; Noll, Josef. (2021) The Snowden Phone: A Comparative Survey of Secure Instant Messaging Mobile Applications . Security and Communication Networks
Academic literature review
Calk, Cameron; Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2021) lr-Multisemigroups, Modal Quantales and the Origin of Locality. Lecture Notes in Computer Science (LNCS)
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2021) Languages of higher-dimensional automata. Mathematical Structures in Computer Science
Academic article
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Thapa, Ratan Bahadur. (2020) Generating Posets Beyond N. Lecture Notes in Computer Science (LNCS)
Academic article
Shrestha, Manish; Johansen, Christian; Noll, Josef; Roverso, Davide. (2020) A Methodology for Security Classification applied to Smart Grid Infrastructures. International Journal of Critical Infrastructure Protection
Academic article
Luteberget, Bjørnar Steinnes; Claessen, Koen; Johansen, Christian. (2019) Automated Drawing of Railway Schematics Using Numerical Optimization in SAT. Lecture Notes in Computer Science (LNCS)
Academic article
Luteberget, Bjørnar; Johansen, Christian; Steffen, Martin. (2019) Synthesis of railway signaling layout from local capacity specifications. Lecture Notes in Computer Science (LNCS)
Academic article
Johansen, Christian; Owe, Olaf. (2019) Dynamic Structural Operational Semantics. Journal of Logical and Algebraic Methods in Programming
Academic article
Hildebrandt, Thomas; Johansen, Christian; Norman, Håkon. (2019) A stable non-interleaving early operational semantics for the pi-calculus. Journal of Logical and Algebraic Methods in Programming
Academic article
Pedersen, Tore; Johansen, Christian. (2019) Behavioural artificial intelligence: an agenda for systematic empirical studies of artificial inference. AI & Society: Knowledge, Culture and Communication
Academic article
Johansen, Christian; Owe, Olaf. (2019) Summary of: Dynamic Structural Operational Semantics. Lecture Notes in Computer Science (LNCS)
Academic article
Pedersen, Tore; Johansen, Christian; Jøsang, Audun. (2018) Behavioural Computer Science: an agenda for combining modelling of human and system behaviours. Human-centric Computing and Information Sciences
Academic article
Luteberget, Bjørnar Steinnes; Johansen, Christian. (2017) Efficient verification of railway infrastructure designs against standard regulations. Formal methods in system design
Academic article
Bursuc, Sergiu; Johansen, Christian; Xu, Shiwei. (2017) Automated verification of dynamic root of trust protocols. Lecture Notes in Computer Science (LNCS)
Academic article
Hildebrandt, Thomas; Johansen, Christian; Normann, Håkon. (2017) A stable non-interleaving early operational semantics for the Pi-calculus. Lecture Notes in Computer Science (LNCS)
Academic article
Luteberget, Bjørnar Steinnes; Camilleri, John J.; Johansen, Christian; Schneider, Gerardo. (2017) Participatory verification of railway infrastructure by representing regulations in RailCNL. Lecture Notes in Computer Science (LNCS)
Academic article
Luteberget, Bjørnar Steinnes; Johansen, Christian; Steffen, Martin. (2016) Rule-based consistency checking of railway infrastructure designs. Lecture Notes in Computer Science (LNCS)
Academic article
Luteberget, Bjørnar Steinnes; Johansen, Christian; Feyling, C; Steffen, Martin. (2016) Rule-based incremental verification tools applied to railway designs and regulations. Lecture Notes in Computer Science (LNCS)
Academic article
Normann, Håkon; Johansen, Christian; Hildebrandt, Thomas. (2016) Declarative event based models of concurrency and refinement in psi-calculi. Journal of Logical and Algebraic Methods in Programming
Academic article
Johansen, Christian. (2016) ST-structures. Journal of Logical and Algebraic Methods in Programming
Academic article
Johansen, Christian; Pedersen, Tore; Jøsang, Audun. (2016) Towards Behavioural Computer Science. IFIP Advances in Information and Communication Technology
Academic article
Johansen, Christian; Jøsang, Audun. (2015) Probabilistic modelling of humans in security ceremonies. Lecture Notes in Computer Science (LNCS)
Academic article
Johansen, Christian. (2014) Actor network procedures as Psi-calculi for security ceremonies. Electronic Proceedings in Theoretical Computer Science (EPTCS)
Academic article
Normann, Håkon; Johansen, Christian; Hildebrandt, Thomas. (2014) Concurrency models with causality and events as psi-calculi. Electronic Proceedings in Theoretical Computer Science (EPTCS)
Academic article

Part of book/report

Arshad, Hamed; Horne, Ross; Johansen, Christian; Owe, Olaf; Willemse, Tim A. C.. (2022) Process Algebra Can Save Lives: Static Analysis of XACML Access Control Policies Using mCRL2. Springer
Academic chapter/article/Conference paper
Noll, Josef; Garitano, Iñaki; Johansen, Christian; Del Ser, Javier; Arenaza-Nuno, Ignacio. (2018) Perspectives in Secure SMART Environments. CRC Press
Academic chapter/article/Conference paper
Tokas, Shukun; Owe, Olaf; Johansen, Christian. (2017) Code Diversification Mechanisms for Securing the Internet of Things.
Academic chapter/article/Conference paper
Migdal, Denis; Johansen, Christian; Jøsang, Audun. (2016) DEMO: OffPAD - Offline Personal Authenticating Device with Applications in Hospitals and e-Banking. Association for Computing Machinery (ACM)
Chapter
Taherkordi, Amirhosein; Johansen, Christian; Eliassen, Frank; Römer, Kay. (2015) Tokenit: Designing State-Driven Embedded Systems through Tokenized Transitions. IEEE (Institute of Electrical and Electronics Engineers)
Academic chapter/article/Conference paper
Johansen, Christian; Jøsang, Audun. (2015) Probabilistic Modeling of Humans in Security Ceremonies. Springer Publishing Company
Academic chapter/article/Conference paper

Report

Ramezanifarkhani, Toktam; Fazeldehkordi, Elahe; Owe, Olaf; Noll, Josef; Johansen, Christian. (2021) Security and Privacy Solutions in IoT and Distributed Systems Design. Faculty of Mathematics and Natural Sciences, UiO
Doctoral dissertation
Tokas, Shukun; Owe, Olaf; Johansen, Christian. (2020) Code Diversification Mechanisms for Internet of Things (Revised Version 2). Universitetet i Oslo Universitetet i Oslo
Report
Shrestha, Manish; Johansen, Christian; Noll, Josef. (2020) Building Confidence using Beliefs and Arguments in Security Class Evaluations for IoT (long version). Universitetet i Oslo Universitetet i Oslo
Report
Shrestha, Manish; Johansen, Christian; Moghadam, Maunya D.; Johansen, Johanna; Noll, Josef. (2020) Tool Support for Security Classification for Internet of Things (long version). Universitetet i Oslo Universitetet i Oslo
Report
Shrestha, Manish; Johansen, Christian; Noll, Josef. (2019) Criteria for Security Classification of Smart Home Energy Management Systems (long version). Universitetet i Oslo Universitetet i Oslo
Report
Luteberget, Bjørnar Steinnes; Camilleri, John J.; Johansen, Christian; Schneider, Gerardo. (2017) Participatory Verification of Railway Infrastructure Regulations using RailCNL (long version). Universitetet i Oslo Universitetet i Oslo
Report
Johansen, Christian; Mujaj, Aulon; Arshad, Hamed; Noll, Josef. (2017) Comparing Implementations of Secure Messaging Protocols (long version). Universitetet i Oslo Universitetet i Oslo
Report
Shrestha, Manish; Johansen, Christian; Noll, Josef. (2017) Security Classification for Smart Grid Infra structures (long version). Universitetet i Oslo Universitetet i Oslo
Report
Johansen, Christian; Jøsang, Audun; Migdal, Denis. (2016) Usable Authentication with an Offline Trusted Device Proxy Architecture (long version). Universitetet i Oslo Universitetet i Oslo
Report
Johansen, Christian; Jøsang, Audun; Migdal, Denis. (2016) Offpad: Offline personal authenticating device: implementations and applications. Universitetet i Oslo Universitetet i Oslo
Report
Johansen, Christian; Pedersen, Tore; Jøsang, Audun. (2016) Reflections on Behavioural Computer Science. Universitetet i Oslo Universitetet i Oslo
Report
Johansen, Christian; Norman, Håkon; Hildebrandt, Thomas. (2016) Non-interleaving Operational Semantics for the Pi-calculus -- technicalities. Universitetet i Oslo Universitetet i Oslo
Report
Luteberget, Bjørnar Steinnes; Johansen, Christian; Steffen, Martin. (2016) Rule-Based Consistency Checking of Railway Infrastructure Designs. Universitetet i Oslo Conference proceedings (Universitetet i Oslo. Institutt for informatikk) (450)
Report

Teaching

Courses

Supervision

For MSc thesis topics, contact me directly before the start of the second year.

Språkvelger

Christian Johansen