5 research outputs found
Reservoir Computing Based Cryptography and Exploration of the Limits of Multifunctionality in NG-RC
Reservoir computing has become the state-of-the-art machine learning algorithm for predicting nonlinear and chaotic dynamics. It features excellent speed and less required training data compared to other deep learning methods. The first part of this thesis makes use of the algorithm’s speed aspect. A new encryption algorithm is developed, which outperforms a previous reservoir computing based encryption
algorithm by a factor of 1000 in terms of encryption speed. Reservoir computing was also successfully applied to simulate biological neural functions. One of these functions is learning multiple tasks with the identical network structure simultaneously, i.e. the ability to be multifunctional. In reservoir computing, the intrinsic network structure is not changed during multifunctional processing, resembling its biological counterpart.
The next generation of reservoir computing (NG-RC) was recently introduced, featuring improved performance. Therefore, the functioning of the reservoir network is replaced by polynomial multiplications of time-shifted input variables. The second part of this thesis explores the limits of multifunctionality in NG-RC. The architecture of the algorithm creates high interpretability of multifunctional behavior. This opens
a new perspective on multifunctionality and allows such behavior to be analyzed by learned governing equations
Blown to Bits: Your Life, Liberty, and Happiness After the Digital Explosion
382 p.Libro ElectrónicoEach of us has been in the computing field for more than 40 years. The book is the product of a lifetime of observing and participating in the changes it has brought. Each of us has been both a teacher and a learner in the field.
This book emerged from a general education course we have taught at Harvard, but it is not a textbook. We wrote this book to share what wisdom we have with as many people as we can reach. We try to paint a big picture,
with dozens of illuminating anecdotes as the brushstrokes. We aim to entertain you at the same time as we provoke your thinking.Preface
Chapter 1 Digital Explosion
Why Is It Happening, and What Is at Stake?
The Explosion of Bits, and Everything Else
The Koans of Bits
Good and Ill, Promise and Peril
Chapter 2 Naked in the Sunlight
Privacy Lost, Privacy Abandoned
1984 Is Here, and We Like It
Footprints and Fingerprints
Why We Lost Our Privacy, or Gave It Away
Little Brother Is Watching
Big Brother, Abroad and in the U.S.
Technology Change and Lifestyle Change
Beyond Privacy
Chapter 3 Ghosts in the Machine
Secrets and Surprises of Electronic Documents
What You See Is Not What the Computer Knows
Representation, Reality, and Illusion
Hiding Information in Images
The Scary Secrets of Old Disks
Chapter 4 Needles in the Haystack
Google and Other Brokers in the Bits Bazaar
Found After Seventy Years
The Library and the Bazaar
The Fall of Hierarchy
It Matters How It Works
Who Pays, and for What?
Search Is Power
You Searched for WHAT? Tracking Searches
Regulating or Replacing the Brokers
Chapter 5 Secret Bits
How Codes Became Unbreakable
Encryption in the Hands of Terrorists, and Everyone Else
Historical Cryptography
Lessons for the Internet Age
Secrecy Changes Forever
Cryptography for Everyone
Cryptography Unsettled
Chapter 6 Balance Toppled
Who Owns the Bits?
Automated Crimes—Automated Justice
NET Act Makes Sharing a Crime
The Peer-to-Peer Upheaval
Sharing Goes Decentralized
Authorized Use Only
Forbidden Technology
Copyright Koyaanisqatsi: Life Out of Balance
The Limits of Property
Chapter 7 You Can’t Say That on the Internet
Guarding the Frontiers of Digital Expression
Do You Know Where Your Child Is on the Web Tonight?
Metaphors for Something Unlike Anything Else
Publisher or Distributor?
Neither Liberty nor Security
The Nastiest Place on Earth
The Most Participatory Form of Mass Speech
Protecting Good Samaritans—and a Few Bad Ones
Laws of Unintended Consequences
Can the Internet Be Like a Magazine Store?
Let Your Fingers Do the Stalking
Like an Annoying Telephone Call?
Digital Protection, Digital Censorship—and Self-Censorship
Chapter 8 Bits in the Air
Old Metaphors, New Technologies, and Free Speech
Censoring the President
How Broadcasting Became Regulated
The Path to Spectrum Deregulation
What Does the Future Hold for Radio?
Conclusion After the Explosion
Bits Lighting Up the World
A Few Bits in Conclusion
Appendix The Internet as System and Spirit
The Internet as a Communication System
The Internet Spirit
Endnotes
Inde
Semi-Quantum Conference Key Agreement (SQCKA)
A need in the development of secure quantum communications is the scalable extension
of key distribution protocols. The greatest advantage of these protocols is the fact that its
security does not rely on mathematical assumptions and can achieve perfect secrecy. In
order to make these protocols scalable, has been developed the concept of Conference
Key Agreements, among multiple users.
In this thesis we propose a key distribution protocol among several users using a
semi-quantum approach. We assume that only one of the users is equipped with quantum
devices and generates quantum states, while the other users are classical, i.e., they are only
equipped with a device capable of measuring or reflecting the information. This approach has
the advantage of simplicity and reduced costs.
We prove our proposal is secure and we present some numerical results on the lower
bounds for the key rate. The security proof applies new techniques derived from some
already well established work.
From the practical point of view, we developed a toolkit called Qis|krypt⟩ that is able to
simulate not only our protocol but also some well-known quantum key distribution protocols.
The source-code is available on the following link:
- https://github.com/qiskrypt/qiskrypt/.Uma das necessidades no desenvolvimento de comunicações quânticas seguras é a extensão
escalável de protocolos de distribuição de chaves. A grande vantagem destes protocolos é o
facto da sua segurança não depender de suposições matemáticas e poder atingir segurança
perfeita. Para tornar estes protocolos escaláveis, desenvolveu-se o conceito de Acordo
de Chaves de Conferência, entre múltiplos utilizadores.
Nesta tese propomos um protocolo para distribuição de chaves entre vários utilizadores
usando uma abordagem semi-quântica. Assumimos que apenas um dos utilizadores está
equipado com dispositivos quânticos e é capaz de gerar estados quânticos, enquanto que
os outros utilizadores são clássicos, isto é, estão apenas equipados com dispositivos capazes
de efectuar uma medição ou refletir a informação. Esta abordagem tem a vantagem de ser
mais simples e de reduzir custos.
Provamos que a nossa proposta é segura e apresentamos alguns resultados numéricos
sobre limites inferiores para o rácio de geração de chaves. A prova de segurança aplica novas
técnicas derivadas de alguns resultados já bem estabelecidos.
Do ponto de vista prático, desenvolvemos uma ferramenta chamada Qis|krypt⟩ que é capaz
de simular não só o nosso protocolo como também outros protocolos distribuição de chaves
bem conhecidos. O código fonte encontra-se disponÃvel no seguinte link:
- https://github.com/qiskrypt/qiskrypt/