Quantum cryptography uses photons polarized in different quantum states to securely transmit encryption keys. It relies on principles of quantum mechanics rather than computational complexity. The BB84 protocol is an early quantum cryptography method where a sender and receiver use different polarization bases to encode and read bits, allowing them to detect if an eavesdropper has accessed the quantum channel. Quantum coin tossing protocols use polarized photons in superposition states for two parties to randomly generate a shared bit without communicating or trusting a third party. While promising for secure communication, quantum cryptography still faces challenges from practical implementation and transmission over long distances.
The role of quantum cryptography in today's world and how it was used in the 2003 fifa world cup and the advances quantum cryptography is making in providing security and showing that how it is next step in the security world.
Quantum Key Distribution Meetup Slides Kirby Linvill
** Note: there is an updated version of the slide deck at https://www.slideshare.net/KirbyLinvill/quantum-key-distribution-meetup-slides-updated. The updates are minor (the bloch sphere in this presentation is incorrectly labelled) and the bulk of the content remains the same **
Slides from a talk on Quantum Key Distribution presented to the Silicon Valley Cyber Security Meetup group. This talk covered a basic intuitive description of the BB84 protocol as well as brief notes on current QKD techniques and vulnerabilities that leave them hackable if not crackable. These slides prioritize conveying intuitive understanding over exact implementation details so some details of the BB84 protocol are different (e.g. using qubit bases rather than polarization bases) or glossed over.
www.lifein01.com - for more info
Quantum cryptography is the science of exploiting quantum mechanical properties to perform cryptographic tasks. The best-known example of quantum cryptography is a quantum key distribution which offers an information-theoretically secure solution to the key exchange problem. The advantage lies in the fact that it allows the completion of various cryptographic tasks that are proven or conjectured to be impossible using only classical communication. It is impossible to copy data encoded in a quantum state.
PUT my all effort to make quantum cryptography easily understandable by the help of basics n videos.Its enough to give you better knowledge about quantum cryptography. Its really interesting topic ;).
Quantum Key Distribution Meetup Slides (Updated)Kirby Linvill
Slides from a talk on Quantum Key Distribution presented to the Silicon Valley Cyber Security Meetup group. This talk covered a basic intuitive description of the BB84 protocol as well as brief notes on current QKD techniques and vulnerabilities that leave them hackable if not crackable. These slides prioritize conveying intuitive understanding over exact implementation details so some details of the BB84 protocol are different (e.g. using qubit bases rather than polarization bases) or glossed over.
Quantum Cryptography is the one of the most successul application of quantum computing/information theory.
cryptography is the coding and decoding of secret messages.
Quantum Key Distribution uses the laws of quantum mechanics, we can distribute keys in perfect secrecy.
Quantum cryptography is the science of exploiting quantum mechanical properties to perform cryptographic tasks. The best known example of quantum cryptography is quantum key distribution which offers an information-theoretically secure solution to the key exchange problem. Currently used popular public-key encryption and signature schemes can be broken by quantum adversaries. The advantage of quantum cryptography lies in the fact that it allows the completion of various cryptographic tasks that are proven or conjectured to be impossible using only classical communication. For example, it is impossible to copy data encoded in a quantum state and the very act of reading data encoded in a quantum state changes the state. This is used to detect eavesdropping in quantum key distribution.
The role of quantum cryptography in today's world and how it was used in the 2003 fifa world cup and the advances quantum cryptography is making in providing security and showing that how it is next step in the security world.
Quantum Key Distribution Meetup Slides Kirby Linvill
** Note: there is an updated version of the slide deck at https://www.slideshare.net/KirbyLinvill/quantum-key-distribution-meetup-slides-updated. The updates are minor (the bloch sphere in this presentation is incorrectly labelled) and the bulk of the content remains the same **
Slides from a talk on Quantum Key Distribution presented to the Silicon Valley Cyber Security Meetup group. This talk covered a basic intuitive description of the BB84 protocol as well as brief notes on current QKD techniques and vulnerabilities that leave them hackable if not crackable. These slides prioritize conveying intuitive understanding over exact implementation details so some details of the BB84 protocol are different (e.g. using qubit bases rather than polarization bases) or glossed over.
www.lifein01.com - for more info
Quantum cryptography is the science of exploiting quantum mechanical properties to perform cryptographic tasks. The best-known example of quantum cryptography is a quantum key distribution which offers an information-theoretically secure solution to the key exchange problem. The advantage lies in the fact that it allows the completion of various cryptographic tasks that are proven or conjectured to be impossible using only classical communication. It is impossible to copy data encoded in a quantum state.
PUT my all effort to make quantum cryptography easily understandable by the help of basics n videos.Its enough to give you better knowledge about quantum cryptography. Its really interesting topic ;).
Quantum Key Distribution Meetup Slides (Updated)Kirby Linvill
Slides from a talk on Quantum Key Distribution presented to the Silicon Valley Cyber Security Meetup group. This talk covered a basic intuitive description of the BB84 protocol as well as brief notes on current QKD techniques and vulnerabilities that leave them hackable if not crackable. These slides prioritize conveying intuitive understanding over exact implementation details so some details of the BB84 protocol are different (e.g. using qubit bases rather than polarization bases) or glossed over.
Quantum Cryptography is the one of the most successul application of quantum computing/information theory.
cryptography is the coding and decoding of secret messages.
Quantum Key Distribution uses the laws of quantum mechanics, we can distribute keys in perfect secrecy.
Quantum cryptography is the science of exploiting quantum mechanical properties to perform cryptographic tasks. The best known example of quantum cryptography is quantum key distribution which offers an information-theoretically secure solution to the key exchange problem. Currently used popular public-key encryption and signature schemes can be broken by quantum adversaries. The advantage of quantum cryptography lies in the fact that it allows the completion of various cryptographic tasks that are proven or conjectured to be impossible using only classical communication. For example, it is impossible to copy data encoded in a quantum state and the very act of reading data encoded in a quantum state changes the state. This is used to detect eavesdropping in quantum key distribution.
Quantum cryptography is the science of exploiting quantum mechanical properties to perform cryptographic tasks. The best known example of quantum cryptography is quantum key distribution which offers an information-theoretically secure solution to the key exchange problem. Currently used popular public-key encryption and signature schemes can be broken by quantum adversaries. The advantage of quantum cryptography lies in the fact that it allows the completion of various cryptographic tasks that are proven or conjectured to be impossible using only classical communication. For example, it is impossible to copy data encoded in a quantum state and the very act of reading data encoded in a quantum state changes the state. This is used to detect eavesdropping in quantum key distribution.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Quantum cryptography by Girisha Shankar, Sr. Manager, CiscoVishnu Pendyala
Quantum computing is said to break the Internet by making the underlying encryption ineffective. This session, hosted by ICON@Cisco tells you how Quantum cryptography, which has the potential to protect the Internet, works.
Course: Information Security
UPC - Universitat Politecnica de Catalunya
A forgotten presentation we did last year.
Just found it thanks to Arinto Murdopo :) http://www.slideshare.net/arinto
Nowadays, the information is exchanged among the computer network. These data and information are involved in business, military, academic education, research and etc. which are shared around the world in both private and public network. Since, many categories of data are required restriction on authorization of access, modify, delete and insert, security in communication is increasingly important to the network communication. Currently, computer security applies mathematic theory to computer security for encrypting and decrypting on both sender and receiver. To use security attack with high performance computer (e.g. quantum computer), attacker can find a key and then obtains the data in feasible period. Quantum cryptography is one of the solutions that use property of polarization to ensure that transmitted data is not trapped by eavesdropper. Quantum cryptography is improved significantly in the last decades including the most two dominant protocol BB84 and BB92.
Quantum cryptography can, in principle, provide unconditional security guaranteed by the law of physics only. Here, we survey the theory and practice of the subject and highlight some recent developments.
INTEGRATING IDENTITY-BASED CRYPTOGRAPHY IN IMS SERVICE AUTHENTICATIONIJNSA Journal
Nowadays, the IP Multimedia Subsystem (IMS) is a promising research field. Many ongoing works related to the security and the performances of its employment are presented to the research community. Although, the security and data privacy aspects are very important in the IMS global objectives, they observe little attention so far. Secure access to multimedia services is based on SIP and HTTP digest on top of IMS architecture. The standard deploys AKA-MD5 for the terminal authentication. The third Generation Partnership Project (3GPP) provided Generic Bootstrapping Architecture (GBA) to authenticate the subscriber before accessing multimedia services over HTTP. In this paper, we propose a new IMS Service Authentication scheme using Identity Based cryptography (IBC). This new scheme will lead to better performances when there are simultaneous authentication requests using Identity-based Batch Verification. We analyzed the security of our new protocol and we presented a performance evaluation of its cryptographic operations.
QUANTUM THREE-PASS PROTOCOL: KEY DISTRIBUTION USING QUANTUM SUPERPOSITION STATESIJNSA Journal
This letter proposes a novel key distribution protocol with no key exchange in advance, which is secure as the BB84 quantum key distribution protocol. Our protocol utilizes a photon in superposition state for single-bit data transmission instead of a classical electrical/optical signal. The security of this protocol relies on the fact, that the arbitrary quantum state cannot be cloned, known as the no-cloning theorem. This protocol can be implemented with current technologies.
Similar to Quantum Cryptography - Quantum Coin Tossing (20)
This Presentation downloaded from : http://wiki.softwarefreedomday.org/Resources and changed little bit for my presentation at Software Freedom Day 2016 , at Free and open Source Software Community National School of Business Management ( FOSS NSBM ) , Sri Lanka .
Gave a talk at Shifting to FOSS 2015 by NSBM Free & open Source Communities about How to Work with Communities and What are the advantages for starters.
This presentation was pitch on HackaDev Uva 2015 . Project for Disaster Management System which included Mobile Solution using Dialog IdeaMart API's , Arduino Box with Several sensors , and Community Driven Open Source Web Solution. Using big-data it was designed to analyze and predict future disasters. also users have access to emergency details using SMS and USSD codes.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
Are you looking to streamline your workflows and boost your projects’ efficiency? Do you find yourself searching for ways to add flexibility and control over your FME workflows? If so, you’re in the right place.
Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part “Essentials of Automation” series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
Here’s what you’ll gain:
- Essentials of FME Parameters: Understand the pivotal role of parameters, including Reader/Writer, Transformer, User, and FME Flow categories. Discover how they are the key to unlocking automation and optimization within your workflows.
- Practical Applications in FME Form: Delve into key user parameter types including choice, connections, and file URLs. Allow users to control how a workflow runs, making your workflows more reusable. Learn to import values and deliver the best user experience for your workflows while enhancing accuracy.
- Optimization Strategies in FME Flow: Explore the creation and strategic deployment of parameters in FME Flow, including the use of deployment and geometry parameters, to maximize workflow efficiency.
- Pro Tips for Success: Gain insights on parameterizing connections and leveraging new features like Conditional Visibility for clarity and simplicity.
We’ll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Don’t miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Elevating Tactical DDD Patterns Through Object CalisthenicsDorra BARTAGUIZ
After immersing yourself in the blue book and its red counterpart, attending DDD-focused conferences, and applying tactical patterns, you're left with a crucial question: How do I ensure my design is effective? Tactical patterns within Domain-Driven Design (DDD) serve as guiding principles for creating clear and manageable domain models. However, achieving success with these patterns requires additional guidance. Interestingly, we've observed that a set of constraints initially designed for training purposes remarkably aligns with effective pattern implementation, offering a more ‘mechanical’ approach. Let's explore together how Object Calisthenics can elevate the design of your tactical DDD patterns, offering concrete help for those venturing into DDD for the first time!
4. Cryptography
• The Art of Writing or Solving Codes.
• Classical Cryptography > Modern Cryptography > Number Theory based Public Key
Cryptography
• One Time Pad
• Key Generation and Key Distribution
5. Background
● Conventional cryptosystems such as ENIGMA, DES, RSA
● Digital communications in principle can always be passively monitored or copied
● Unless the key,used once only and long as clear text
● Computational complexity is not well enough understood
● Quantum Computers can use Shor’ Algorithm to break
6. Quantum cryptography uses photons to transmit a key.
Quantum cryptology depends on physics, not mathematics.
Heisenberg's Uncertainty Principle & Photon Polarization
Quantum key distribution protocols
Quantum Cryptography
QC = QKD + OTP
7. Background
● Conventional Computing - Bits
● Quantum Computing – Quantum Bits or Qubits (/ kju b t/)ˈ ː ɪ
● Qubit could be a Photon, Electron, Nucleus..
● In a Quantum State particle can achieve a “Superposition”
● Quantum Computers can overcome todays computational limitations
8. Essential properties of polarized photons
• Photons - Photons are the fundamental particle of light.
– wave function : An individual photon can be described as having right or left circular
polarization, or a superposition of the two.
• The foundation of quantum physics is the unpredictability factor.
– Heisenberg's Uncertainty Principle :
• Photon polarization
– polarization filters, photon to take one state or another -- or polarize it.
• Rectilinear basis (0 and 90 degrees)
• Diagonal basis (45 and 135 degrees)
9. • Heisenberg uncertainty principle :
- states that certain pairs of physical properties are related in such a way that measuring one
property prevents the observer from simultaneously knowing the value for other.
• Principle of photon polarization:
- tells that an eavesdropper cannot copy unknown Qubits
Explanation
11. QKD Protocols
• A protocol is a set of rules governing the exchange of messages over a channel.
• A security protocol is a special protocol designed to ensure security properties are met during
communications.
• There are three main security protocols for QKD:BB84, B92, and Entanglement-Based QKD.
12. Eve
• Unique property gain knowledge about eve trying get the key
• By using quantum superposition/entanglement and transmitting information in quantum states , a
communication system can be implemented which can detect eavesdropping.
• If the level of eavesdropping is below threshold , a key is produced guarantying the secure
communication otherwise no secure key is possible and communication is aborted
13. BB84 Communication Protocol
● BB84 is a quantum key distribution scheme developed by Charles Bennett and Gilles Brassard
in 1984.
● It is the first quantum cryptography protocol
● Use Photon polarization
● four different non-orthogonal quantum states via a quantum channel to transmit the qubits
● A device called a polarizer allows us to place a photon in a particular polarization. A Pockels Cell
can be used too.
● The polarization basis is the mapping we decide to use for a particular state
14.
15.
16. ● Let us suppose she uses the vertical and the +45 o polarisations for encoding the 0" and the
horizontal and -45 o polarisations to encode the 1"
● Bob then randomly uses either a polarizer for diagonal polarisations or one in the
horizontal/vertical basis and records his choice and the polarization he measures
● Bob tells Alice on the public channel the sequence of analyzers he used during the
transmission, but not his results
● Alice compares Bob's sequence with hers and tells him which bits correspond to the photons
she sent
● these compatible bits are used for the shared key
17. BB84 with eavesdropping
• If an eavesdropper Eve tries to tap the channel, this will automatically show up in Bob’s
measurements.
• In those cases where Alice and Bob have used the same basis, Bob is likely to obtain an incorrect
measurement: Eve’s measurements are bound to affect the states of the photons.
• As Eve intercepts Alice’s photons, she has to measure them with a random basis and send new
photons to Bob.`
• The photon states cannot be cloned (non-clone ability).
• Eve’s presence is always detected: measuring a quantum system irreparably alters its state.
18. Quantum coin tossing
➔ First discussed ‘Coin Flipping by Telephone’ by Manuel Blum, 1983
➔ Two unknown party communicate without third party
20. Coin Tossing (Cont>._)
● Alice choose random basis ( Rectilinear ) and sequece of random bits ( 1000 should be enough ) .
● Use the polarization and send to Bob
● Bob use polarizer for each bit
● Two tables Rectilinear and diagonal photon table
● Polarizer can loss some photons
● Bob Make his guess
● Alice says if bob wins and tell her basis and
● Send entire bit sequece over classical channel
● Bob verify no cheating by providing his tables
21. Current Arguments
QKD is not Public key Cryptography
Eve can sabotage quantum channel to force Alice and Bob use classical channel
Expensive for longer keys
“the coding and decoding of secret messages.”
The basic idea is to modify a message so as to make it unintelligible to anyone but the intended recipient.
Cryptosystem (Cipher System) – method of disguising messages so that only certain people can read them
Cryptography – Art of creating and using Cryptosystems
Cryptanalysis – Art of breaking Cryptosystems
Cryptology – study of Cryptography and Cryptosystems
based on a mixture of guesswork and mathematics
relies heavily on the complexity of factoring integers
To prove the computation security of public key cryptosystem
Via quantum channel to transmit the bits of Alice's random key
In a Quantum State particle can achieve a “Superposition”
– Its Exist in multiple ways simultaneously
It's impossible to know both an object's position and velocity -- at the same time.
Through the use of polarization filters, we can force the photon to take one state or another -- or polarize it.
due to non-cloning algorithm.
• We will only discuss BB84 here.
• Unique property of quantum cryptography is the ability of two communicating users to detect the presence of third party trying to gain knowledge of the key.
Let us suppose she uses the vertical and the +45 o polarisations for encoding the \0" and the horizontal and -45 o polarisations to encode the \1"
bob then randomly uses either a polarizer for diagonal polarisations or one in the horizontal/vertical basis and records his choice and the polarization he
measures (Fig. 1 and Table I). The probability of using the wrong analyzer and therefore obtaining a random result is 50%
horizontal and -45 o polarisations to encode the \1"
Bob then randomly uses either a polarizer for diagonal polarisations or one in the horizontal/vertical basis and records his choice and the polarization he measures
Bob tells Alice on the public channel the sequence of analyzers he used during the transmission, but not his results
Alice compares Bob's sequence with hers and tells him which bits correspond to the photons she sent
these compatible bits are used for the shared key
come to agree on a winner and a loser in such a way that each party has exactly 50 percent chance of winning
Alice choose random basis ( Rectilinear ) and sequence of random bits ( 1000 should be enough ) .
Use the polarization and send to Bob
Bob use polarizer for each bit
Two tables Rectiliear and diagonal photon table
Polarizer can loss some photons
Bob Make his guess
Alice says if bob wins and tell her basis and
Send entire bit sequece over classical channel
Bob verify no cheating by providing his tables
Alice Cheating
If cheat on step 3 , she need to say diagonal, bobs table probabilistic behavior of the photons after they left her hands
If cheat on step 1 , Sending mixture of diagonal and rectilinear , or polarized neither both basis , she will not be able to agree bobs out put.
Bob to cheat - Bob would need to guess Alice’s basis with probability greater than 1 / 2.
Alice Cheating
If cheat on step 3 , she need to say diagonal, bobs table probabilistic behavior of the photons after they left her hands
If cheat on step 1 , Sending mixture of diagonal and rectilinear , or polarized neither both basis , she will not be able to agree bobs out put.