Personal details

Dr Leonie Simpson
Senior Lecturer
Science and Engineering Faculty,
Electrical Engineering, Computer Science,
Information Security
Discipline *
Data Format
+61 7 3138 2126
+61 7 3138 1214
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PhD (Queensland University of Technology), BAppSc(Hons) (Queensland University of Technology), BA (University of Queensland), DipTeach(Secondary) (Brisbane College of Adv. Ed.)

Professional memberships
and associations

Member of International Association for Cryptologic Research (IACR)


Information Security, Cryptography, Symmetric Encryption, Stream Ciphers, Block Ciphers, Authenticated Encryption, Authenticated Encryption with Associated Data, Key Derivation Functions, Cryptanalysis, Communications Security

* Field of Research code, Australian and New Zealand Standard Research Classification (ANZSRC), 2008


Background Leonie is a Senior Lecturer in the School of Electrical Engineering and Computer Science. Leonie is a cryptographer whose research focusses on symmetric cryptography. Her doctoral thesis (QUT, 2000) examined design and analysis of certain types of stream ciphers, and she retains a strong interest in stream ciphers, but has broadened her research scope to symmetric ciphers, and modes of operation of ciphers. Leonie has a strong interest in the broader field of information security, where cryptography is applied to secure information. She is particularly interested in cryptographic algorithms suitable for implementation in small devices. These will be useful in improving IoT security.
Current research areas:

  • Authenticated encryption

Investigation of methods for providing both confidentiality and authentication of messages in a very efficient manner. For many applications, processing to provide security services needs to be fast, as the transmission is in real time (for example, mobile phone communications). However, small devices impose constraints in terms of the implementation footprint and memory and power availability.

  • Initialisation of stream ciphers

Stream Ciphers are often used for frame-based communications. Examples include mobile phone communications and internet transmissions. The same secret key is used with different known initial vectors (for example, frame number) to produce different initial states, and hence different keystreams. The process of forming different initial states from the same secret information requires careful consideration to avoid revealing the secret key.

This information has been contributed by Dr Leonie Simpson.


Teaching discipline: Computer Science

Current teaching areas: Leonie teaches introductory courses in information security, and also cryptography.

Information Security:

  • CAB240 Information Security (Semester 2)
  • IFN511 Security management (Semester 1)


  • IFN642 Applied Crypto and Network Security (Semester 1)
This information has been contributed by Dr Leonie Simpson.


For more publications by this staff member, visit QUT ePrints, the University's research repository.

Research projects

Grants and projects (Category 1: Australian Competitive Grants only)

Efficient and Secure Word-Based Stream Ciphers for Wireless Communications
Primary fund type
CAT 1 - Australian Competitive Grant
Project ID
Start year
Wireless Communications; Synchronous; Boolean Functions; Stream Ciphers; Encryption; Word Based