Cryptography and data security involves number theory concepts like groups, rings, fields, and modular arithmetic. Some key ideas discussed include:
1) The integers under addition form a cyclic group, and the theorem that for any finite group G and element a in G, a raised to the order of G is the identity element.
2) Modular arithmetic defines equivalence classes for integers modulo n, and the set of residues Zn forms an abelian group under addition.
3) The multiplicative integers modulo n, Zn*, form a group whose size is given by Euler's totient function φ(n). For prime p, φ(p) = p - 1.
Malware can spread through media files like videos, music and images. Attackers use social engineering tricks to get users to download malware disguised as codecs or licenses. Various exploits in media file formats and plugins allow inserting malicious scripts. Users should disable risky player settings like URLANDEXIT, check files with scanning tools, and avoid untrusted sources.
This document provides eight rules for writing secure PHP programs:
1. Use proper cryptography and do not invent your own algorithms.
2. Validate all input from external sources before using.
3. Sanitize data sent to databases or other systems to prevent injection attacks.
4. Avoid leaking sensitive information through error messages or other means.
5. Properly manage user sessions to prevent hijacking and ensure users remain authenticated.
6. Enforce authentication and authorization separately using least privilege.
7. Use SSL/TLS to encrypt all authenticated or sensitive communications.
8. Keep security straightforward and avoid relying on obscurity.
This document summarizes a presentation on managing software development. It discusses topics like deliberate discovery during iteration 0 to reduce risk, using story counts to measure scope, making estimates to inform budgeting decisions but not as commitments, using techniques like WIP limits and story maps to manage backlogs, defining "Done" with pre-agreed upon criteria, and taking an iterative development approach with incremental estimates. The overall presentation provides guidance on processes and practices for effectively planning and managing a software development project.
Cryptography and data security involves number theory concepts like groups, rings, fields, and modular arithmetic. Some key ideas discussed include:
1) The integers under addition form a cyclic group, and the theorem that for any finite group G and element a in G, a raised to the order of G is the identity element.
2) Modular arithmetic defines equivalence classes for integers modulo n, and the set of residues Zn forms an abelian group under addition.
3) The multiplicative integers modulo n, Zn*, form a group whose size is given by Euler's totient function φ(n). For prime p, φ(p) = p - 1.
Malware can spread through media files like videos, music and images. Attackers use social engineering tricks to get users to download malware disguised as codecs or licenses. Various exploits in media file formats and plugins allow inserting malicious scripts. Users should disable risky player settings like URLANDEXIT, check files with scanning tools, and avoid untrusted sources.
This document provides eight rules for writing secure PHP programs:
1. Use proper cryptography and do not invent your own algorithms.
2. Validate all input from external sources before using.
3. Sanitize data sent to databases or other systems to prevent injection attacks.
4. Avoid leaking sensitive information through error messages or other means.
5. Properly manage user sessions to prevent hijacking and ensure users remain authenticated.
6. Enforce authentication and authorization separately using least privilege.
7. Use SSL/TLS to encrypt all authenticated or sensitive communications.
8. Keep security straightforward and avoid relying on obscurity.
This document summarizes a presentation on managing software development. It discusses topics like deliberate discovery during iteration 0 to reduce risk, using story counts to measure scope, making estimates to inform budgeting decisions but not as commitments, using techniques like WIP limits and story maps to manage backlogs, defining "Done" with pre-agreed upon criteria, and taking an iterative development approach with incremental estimates. The overall presentation provides guidance on processes and practices for effectively planning and managing a software development project.
The document summarizes the paper "Secure Information Aggregation in Sensor Networks" which proposes a framework called aggregate-commit-prove for securely computing aggregation functions like median, min/max, counting distinct elements in sensor networks even if sensors or aggregators are compromised. It describes the sensor network model, attack model, and gives concrete sublinear protocols for computing specific aggregation functions that allow the base station to detect incorrect results with high probability.
Aleksandr Yampolskiy provides six steps for recruiting great engineers: 1) Look in places engineers frequent like meetups rather than just job boards, 2) Know what attracts developers like working with other great engineers and learning new technologies, 3) Move slowly in hiring and quickly in firing to find the right cultural fit, 4) Make recruitment a company-wide priority through referrals and selling the opportunity, 5) Be willing to try unconventional tactics to source candidates, and 6) Accept that failure is part of the process and learn from mistakes. The key is finding passionate engineers solving problems in new ways.
1. The document discusses a model for analyzing traffic flows in networks where individual agents route traffic selfishly according to latency costs.
2. It shows that for linear latency functions, the ratio between the cost of the Nash equilibrium flow and the optimal flow (the price of anarchy) is 4/3, independent of network topology.
3. For general latency functions, the price of anarchy may be larger and depends on properties of the latency function class, but is still independent of network topology.
WeDo Technologies Worldwide User Group 2013 - Post Event BrochureSérgio Silvestre
The document provides information about WeDo Technologies' Worldwide User Group conference that was held from May 20-22, 2013 in Braga, Portugal. Some key details:
- 240 total attendees from 62 telecom operators across 45 countries
- 22 speakers from telecom operator companies discussed topics like revenue assurance, fraud management, roaming management, and new trends
- Keynotes were provided by executives from Portugal Telecom and Cricket Communications
- A panel discussion on the future of revenue assurance and fraud management included representatives from Capgemini, Ernst & Young, and KPMG
The document outlines 11 case scenarios that an expert may encounter and provides questions to consider for each scenario. The scenarios include deciding whether to enter a new market, evaluating mergers and acquisitions, reducing costs, increasing sales and profits, executing a turnaround, responding to competitors, developing new products, determining pricing strategies, pursuing growth strategies, starting a new business, and using frameworks like the five C's and four P's for analysis.
The document discusses weaknesses in random number generation and pseudorandom number generation (PRNG) that can be exploited by attackers. It provides examples of programs that used weak PRNGs, allowing session IDs and keys to be guessed. Lessons learned are that numbers used to derive keys and IDs must be truly random and unpredictable, and PRNGs must be cryptographically secure. Two types of randomness are defined: true randomness from unpredictable sources, and pseudorandomness from cryptographically secure PRNGs seeded with true randomness.
Battle of the board!!! subject verb agreementrrbriggs
The document describes a game where two teams compete to identify the correct verb form for different sentences. Players from each team take turns going to the correct side of the board to identify whether a verb is in its base form or third person singular form. Whichever team has the most correct answers at the end of the game wins.
The document is notes on information theory and coding created by Akshansh Chaudhary based on lectures from Dr. Anand Kumar. It includes disclaimers about the accuracy of the information and reserves the right to modify or limit access to the content. The notes were created in 2014 and cover topics related to information theory and coding.
This document provides an overview of information theory and coding. It begins with an introduction and table of contents. The main topics covered include:
1. Probability theory and random variables
2. Random processes
3. Elements of information theory
4. Source encoding
5. Error control coding for digital communication systems
6. Error detection and correction
7. Field algebra
8. Linear block codes
9. Cyclic codes
10. BCH codes
Each chapter provides explanations of key concepts and mathematical models within each topic area. Examples and practice problems are also included to help readers understand the concepts. The overall document serves as a comprehensive textbook on information theory and coding.
The document discusses digital communication systems. It provides examples of digital communication including an email sent to invite team members to a meeting. It then explains the key building blocks of a digital communication system including the input source, source encoder, channel encoder, digital modulator, channel, digital demodulator, channel decoder, source decoder and output transducer. The document also discusses channels used for digital communication, causes of signal loss, and comparisons between digital and analog communication systems.
The document summarizes the paper "Secure Information Aggregation in Sensor Networks" which proposes a framework called aggregate-commit-prove for securely computing aggregation functions like median, min/max, counting distinct elements in sensor networks even if sensors or aggregators are compromised. It describes the sensor network model, attack model, and gives concrete sublinear protocols for computing specific aggregation functions that allow the base station to detect incorrect results with high probability.
Aleksandr Yampolskiy provides six steps for recruiting great engineers: 1) Look in places engineers frequent like meetups rather than just job boards, 2) Know what attracts developers like working with other great engineers and learning new technologies, 3) Move slowly in hiring and quickly in firing to find the right cultural fit, 4) Make recruitment a company-wide priority through referrals and selling the opportunity, 5) Be willing to try unconventional tactics to source candidates, and 6) Accept that failure is part of the process and learn from mistakes. The key is finding passionate engineers solving problems in new ways.
1. The document discusses a model for analyzing traffic flows in networks where individual agents route traffic selfishly according to latency costs.
2. It shows that for linear latency functions, the ratio between the cost of the Nash equilibrium flow and the optimal flow (the price of anarchy) is 4/3, independent of network topology.
3. For general latency functions, the price of anarchy may be larger and depends on properties of the latency function class, but is still independent of network topology.
WeDo Technologies Worldwide User Group 2013 - Post Event BrochureSérgio Silvestre
The document provides information about WeDo Technologies' Worldwide User Group conference that was held from May 20-22, 2013 in Braga, Portugal. Some key details:
- 240 total attendees from 62 telecom operators across 45 countries
- 22 speakers from telecom operator companies discussed topics like revenue assurance, fraud management, roaming management, and new trends
- Keynotes were provided by executives from Portugal Telecom and Cricket Communications
- A panel discussion on the future of revenue assurance and fraud management included representatives from Capgemini, Ernst & Young, and KPMG
The document outlines 11 case scenarios that an expert may encounter and provides questions to consider for each scenario. The scenarios include deciding whether to enter a new market, evaluating mergers and acquisitions, reducing costs, increasing sales and profits, executing a turnaround, responding to competitors, developing new products, determining pricing strategies, pursuing growth strategies, starting a new business, and using frameworks like the five C's and four P's for analysis.
The document discusses weaknesses in random number generation and pseudorandom number generation (PRNG) that can be exploited by attackers. It provides examples of programs that used weak PRNGs, allowing session IDs and keys to be guessed. Lessons learned are that numbers used to derive keys and IDs must be truly random and unpredictable, and PRNGs must be cryptographically secure. Two types of randomness are defined: true randomness from unpredictable sources, and pseudorandomness from cryptographically secure PRNGs seeded with true randomness.
Battle of the board!!! subject verb agreementrrbriggs
The document describes a game where two teams compete to identify the correct verb form for different sentences. Players from each team take turns going to the correct side of the board to identify whether a verb is in its base form or third person singular form. Whichever team has the most correct answers at the end of the game wins.
The document is notes on information theory and coding created by Akshansh Chaudhary based on lectures from Dr. Anand Kumar. It includes disclaimers about the accuracy of the information and reserves the right to modify or limit access to the content. The notes were created in 2014 and cover topics related to information theory and coding.
This document provides an overview of information theory and coding. It begins with an introduction and table of contents. The main topics covered include:
1. Probability theory and random variables
2. Random processes
3. Elements of information theory
4. Source encoding
5. Error control coding for digital communication systems
6. Error detection and correction
7. Field algebra
8. Linear block codes
9. Cyclic codes
10. BCH codes
Each chapter provides explanations of key concepts and mathematical models within each topic area. Examples and practice problems are also included to help readers understand the concepts. The overall document serves as a comprehensive textbook on information theory and coding.
The document discusses digital communication systems. It provides examples of digital communication including an email sent to invite team members to a meeting. It then explains the key building blocks of a digital communication system including the input source, source encoder, channel encoder, digital modulator, channel, digital demodulator, channel decoder, source decoder and output transducer. The document also discusses channels used for digital communication, causes of signal loss, and comparisons between digital and analog communication systems.