Christian Johansen

Om

See hjemeside 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.

Forskning

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)

Publikasjoner

2026

Aubert, Clément; Horne, Ross; Johansen, Christian; Mauw, Sjouke. (2026) Unlinkability and history preserving bisimilarity. Computers & Security
Vitenskapelig artikkel
Szalkowski, Gabriel Andy; Windekilde, Iwona Maria; Johansen, Christian. (2026) Towards sustainable short-form video: Modelling solutions for social and environmental challenges. F1000 Research
Vitenskapelig artikkel

2025

Szalkowski, Gabriel Andy; Johansen, Christian. (2025) Evidence of diseconomies of scale in subscription-based video on demand services: The case of Netflix. IEEE Access
Vitenskapelig artikkel

2024

Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2024) KLEENE THEOREM FOR HIGHER-DIMENSIONAL AUTOMATA. Logical Methods in Computer Science
Vitenskapelig artikkel
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
Vitenskapelig artikkel

2023

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

2022

Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) A Kleene Theorem for Higher-Dimensional Automata. Leibniz International Proceedings in Informatics
Vitenskapelig artikkel
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
Vitenskapelig artikkel
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.
Vitenskapelig kapittel
Arshad, Hamed; Johansen, Christian; Owe, Olaf. (2022) Semantic Attribute-Based Access Control: A review on current status and future perspectives. Journal of systems architecture
Vitenskapelig oversiktsartikkel
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) Domain Semirings United. Acta Cybernetica
Vitenskapelig artikkel
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
Vitenskapelig artikkel
Johansen, Johanna; Pedersen, Tore; Fischer-Hübner, Simone; Johansen, Christian; Schneider, Gerardo; Roosendaal, Arnold; Zwingelberg, Harald; Sivesind, Anders Jakob; Noll, Josef. (2022) A multidisciplinary definition of privacy labels. Information and Computer Security
Vitenskapelig artikkel
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) Posets with interfaces as a model for concurrency. Information and Computation
Vitenskapelig artikkel
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)
Vitenskapelig artikkel

2021

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)
Vitenskapelig artikkel
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
Vitenskapelig artikkel
Johansen, Johanna; Pedersen, Tore; Johansen, Christian. (2021) Studying human-to-computer bias transference. AI & Society: Knowledge, Culture and Communication
Vitenskapelig artikkel
Ramezanifarkhani, Toktam; Fazeldehkordi, Elahe; Owe, Olaf; Noll, Josef; Johansen, Christian. (2021) Security and Privacy Solutions in IoT and Distributed Systems Design. Universitetet i Oslo
Doktoravhandling
Luteberget, Bjørnar Steinnes; Johansen, Christian. (2021) Drawing with SAT: four methods and A tool for producing railway infrastructure schematics. Formal Aspects of Computing
Vitenskapelig artikkel
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)
Vitenskapelig artikkel
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
Vitenskapelig oversiktsartikkel
Fahrenberg, Uli; Johansen, Christian; Trotter, Christopher A.; Ziemiański, Krzysztof. (2021) Sculptures in concurrency. Logical Methods in Computer Science
Vitenskapelig artikkel
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2021) Languages of higher-dimensional automata. Mathematical Structures in Computer Science
Vitenskapelig artikkel

2020

Tokas, Shukun; Owe, Olaf; Johansen, Christian. (2020) Code Diversification Mechanisms for Internet of Things (Revised Version 2). Universitetet i Oslo
Forskningsrapport
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Thapa, Ratan Bahadur. (2020) Generating Posets Beyond N. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
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
Vitenskapelig artikkel
Shrestha, Manish; Johansen, Christian; Noll, Josef. (2020) Building Confidence using Beliefs and Arguments in Security Class Evaluations for IoT (long version). Universitetet i Oslo
Forskningsrapport
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
Forskningsrapport

2019

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

2018

Noll, Josef; Garitano, Iñaki; Johansen, Christian; Ser, Javier Del; Arenaza-Nuno, Ignacio. (2018) Perspectives in Secure SMART Environments.
Vitenskapelig kapittel
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
Vitenskapelig artikkel

2017

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

2016

Johansen, Christian; Jøsang, Audun; Migdal, Denis. (2016) Offpad: Offline personal authenticating device: implementations and applications. Universitetet i Oslo
Forskningsrapport
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
Vitenskapelig artikkel
Normann, Håkon; Johansen, Christian; Hildebrandt, Thomas. (2016) Non-interleaving Operational Semantics for the Pi-calculus -- technicalities. Universitetet i Oslo
Forskningsrapport
Johansen, Christian; Pedersen, Tore; Jøsang, Audun. (2016) Reflections on Behavioural Computer Science. Universitetet i Oslo
Forskningsrapport
Johansen, Christian; Jøsang, Audun; Migdal, Denis. (2016) Usable Authentication with an Offline Trusted Device Proxy Architecture (long version). Universitetet i Oslo
Forskningsrapport
Johansen, Christian. (2016) ST-structures. Journal of Logical and Algebraic Methods in Programming
Vitenskapelig artikkel
Migdal, Denis; Johansen, Christian; Jøsang, Audun. (2016) DEMO: OffPAD - Offline Personal Authenticating Device with Applications in Hospitals and e-Banking.
Faglig kapittel
Johansen, Christian; Pedersen, Tore; Jøsang, Audun. (2016) Towards Behavioural Computer Science. IFIP Advances in Information and Communication Technology
Vitenskapelig artikkel
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)
Vitenskapelig artikkel
Luteberget, Bjørnar Steinnes; Johansen, Christian; Steffen, Martin. (2016) Rule-based consistency checking of railway infrastructure designs. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
Luteberget, Bjørnar Steinnes; Johansen, Christian; Steffen, Martin. (2016) Rule-Based Consistency Checking of Railway Infrastructure Designs. Universitetet i Oslo
Forskningsrapport

2015

Taherkordi, Amirhosein; Johansen, Christian; Eliassen, Frank; Römer, Kay. (2015) Tokenit: Designing State-Driven Embedded Systems through Tokenized Transitions.
Vitenskapelig kapittel
Johansen, Christian; Jøsang, Audun. (2015) Probabilistic modelling of humans in security ceremonies. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
Johansen, Christian; Jøsang, Audun. (2015) Probabilistic Modeling of Humans in Security Ceremonies.
Vitenskapelig kapittel

2014

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

Tidsskriftspublikasjoner

Aubert, Clément; Horne, Ross; Johansen, Christian; Mauw, Sjouke. (2026) Unlinkability and history preserving bisimilarity. Computers & Security
Vitenskapelig artikkel
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
Pedersen, Tore; Johansen, Christian. (2019) Behavioural artificial intelligence: an agenda for systematic empirical studies of artificial inference. AI & Society: Knowledge, Culture and Communication
Vitenskapelig artikkel
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2023) Catoids and modal convolution algebras. Algebra Universalis
Vitenskapelig artikkel
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) A Kleene Theorem for Higher-Dimensional Automata. Leibniz International Proceedings in Informatics
Vitenskapelig artikkel
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)
Vitenskapelig artikkel
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
Johansen, Johanna; Pedersen, Tore; Johansen, Christian. (2021) Studying human-to-computer bias transference. AI & Society: Knowledge, Culture and Communication
Vitenskapelig artikkel
Johansen, Christian; Jøsang, Audun. (2015) Probabilistic modelling of humans in security ceremonies. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
Luteberget, Bjørnar Steinnes; Johansen, Christian. (2017) Efficient verification of railway infrastructure designs against standard regulations. Formal methods in system design
Vitenskapelig artikkel
Johansen, Christian. (2016) ST-structures. Journal of Logical and Algebraic Methods in Programming
Vitenskapelig artikkel
Luteberget, Bjørnar Steinnes; Claessen, Koen; Johansen, Christian. (2019) Automated Drawing of Railway Schematics Using Numerical Optimization in SAT. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Thapa, Ratan Bahadur. (2020) Generating Posets Beyond N. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
Johansen, Christian; Pedersen, Tore; Jøsang, Audun. (2016) Towards Behavioural Computer Science. IFIP Advances in Information and Communication Technology
Vitenskapelig artikkel
Johansen, Christian; Owe, Olaf. (2019) Dynamic Structural Operational Semantics. Journal of Logical and Algebraic Methods in Programming
Vitenskapelig artikkel
Johansen, Christian; Owe, Olaf. (2019) Summary of: Dynamic Structural Operational Semantics. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2024) KLEENE THEOREM FOR HIGHER-DIMENSIONAL AUTOMATA. Logical Methods in Computer Science
Vitenskapelig artikkel
Luteberget, Bjørnar Steinnes; Johansen, Christian. (2021) Drawing with SAT: four methods and A tool for producing railway infrastructure schematics. Formal Aspects of Computing
Vitenskapelig artikkel
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)
Vitenskapelig artikkel
Arshad, Hamed; Johansen, Christian; Owe, Olaf. (2022) Semantic Attribute-Based Access Control: A review on current status and future perspectives. Journal of systems architecture
Vitenskapelig oversiktsartikkel
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
Vitenskapelig artikkel
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) Domain Semirings United. Acta Cybernetica
Vitenskapelig artikkel
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)
Vitenskapelig artikkel
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
Vitenskapelig oversiktsartikkel
Luteberget, Bjørnar Steinnes; Johansen, Christian; Steffen, Martin. (2019) Synthesis of railway signaling layout from local capacity specifications. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
Bursuc, Sergiu; Johansen, Christian; Xu, Shiwei. (2017) Automated verification of dynamic root of trust protocols. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
Szalkowski, Gabriel Andy; Johansen, Christian. (2025) Evidence of diseconomies of scale in subscription-based video on demand services: The case of Netflix. IEEE Access
Vitenskapelig artikkel
Szalkowski, Gabriel Andy; Windekilde, Iwona Maria; Johansen, Christian. (2026) Towards sustainable short-form video: Modelling solutions for social and environmental challenges. F1000 Research
Vitenskapelig artikkel
Fahrenberg, Uli; Johansen, Christian; Trotter, Christopher A.; Ziemiański, Krzysztof. (2021) Sculptures in concurrency. Logical Methods in Computer Science
Vitenskapelig artikkel
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
Johansen, Johanna; Pedersen, Tore; Fischer-Hübner, Simone; Johansen, Christian; Schneider, Gerardo; Roosendaal, Arnold; Zwingelberg, Harald; Sivesind, Anders Jakob; Noll, Josef. (2022) A multidisciplinary definition of privacy labels. Information and Computer Security
Vitenskapelig artikkel
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2022) Posets with interfaces as a model for concurrency. Information and Computation
Vitenskapelig artikkel
Fahrenberg, Uli; Johansen, Christian; Struth, Georg; Ziemiański, Krzysztof. (2021) Languages of higher-dimensional automata. Mathematical Structures in Computer Science
Vitenskapelig artikkel
Arshad, Hamed; Picazo Sanchez, Pablo; Johansen, Christian; Schneider, Gerardo. (2023) Attribute-based encryption with enforceable obligations. Journal of Cryptographic Engineering (JCEN)
Vitenskapelig artikkel
Luteberget, Bjørnar Steinnes; Johansen, Christian; Steffen, Martin. (2016) Rule-based consistency checking of railway infrastructure designs. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
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)
Vitenskapelig artikkel
Hildebrandt, Thomas; Johansen, Christian; Normann, Håkon. (2017) A stable non-interleaving early operational semantics for the Pi-calculus. Lecture Notes in Computer Science (LNCS)
Vitenskapelig artikkel
Szalkowski, Gabriel Andy; Johansen, Christian. (2023) Defining and measuring the effects of digital technologies on social sustainability: A systematic literature review. Sustainable Development
Vitenskapelig oversiktsartikkel
Johansen, Christian. (2014) Actor network procedures as Psi-calculi for security ceremonies. Electronic Proceedings in Theoretical Computer Science (EPTCS)
Vitenskapelig artikkel
Normann, Håkon; Johansen, Christian; Hildebrandt, Thomas. (2014) Concurrency models with causality and events as psi-calculi. Electronic Proceedings in Theoretical Computer Science (EPTCS)
Vitenskapelig artikkel
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)
Vitenskapelig artikkel

Del av bok/rapport

Taherkordi, Amirhosein; Johansen, Christian; Eliassen, Frank; Römer, Kay. (2015) Tokenit: Designing State-Driven Embedded Systems through Tokenized Transitions.
Vitenskapelig kapittel
Noll, Josef; Garitano, Iñaki; Johansen, Christian; Ser, Javier Del; Arenaza-Nuno, Ignacio. (2018) Perspectives in Secure SMART Environments.
Vitenskapelig kapittel
Migdal, Denis; Johansen, Christian; Jøsang, Audun. (2016) DEMO: OffPAD - Offline Personal Authenticating Device with Applications in Hospitals and e-Banking.
Faglig kapittel
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.
Vitenskapelig kapittel
Tokas, Shukun; Owe, Olaf; Johansen, Christian. (2017) Code Diversification Mechanisms for Securing the Internet of Things.
Vitenskapelig kapittel
Johansen, Christian; Jøsang, Audun. (2015) Probabilistic Modeling of Humans in Security Ceremonies.
Vitenskapelig kapittel

Rapport

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

Studentoppgave eller avhandling

Ramezanifarkhani, Toktam; Fazeldehkordi, Elahe; Owe, Olaf; Noll, Josef; Johansen, Christian. (2021) Security and Privacy Solutions in IoT and Distributed Systems Design. Universitetet i Oslo
Doktoravhandling

Språkvelger