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The document describes several input-process-output systems using a PIC microcontroller and other components like Visual Basic, RS-232, transmitters, receivers, LEDs, switches, relays, and more. The systems transmit data wirelessly via RF or send SMS messages via GSM modem when inputs like smoke detection, switch presses, magnetic contacts, or RFID tags are detected. Outputs include LEDs turning on, loads being powered, doors opening/closing, and SMS messages being sent.
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ScyllaDB monitoring provides a lot of useful information. But sometimes it’s not easy to find the root of the problem if something is wrong or even estimate the remaining capacity by the load on the cluster. This talk shares our team's practical tips on: 1) How to find the root of the problem by metrics if ScyllaDB is slow 2) How to interpret the load and plan capacity for the future 3) Compaction strategies and how to choose the right one 4) Important metrics which aren’t available in the default monitoring setup.
QR Secure: A Hybrid Approach Using Machine Learning and Security Validation F...
QR Secure: A Hybrid Approach Using Machine Learning and Security Validation Functions to Prevent Interaction with Malicious QR Codes.
Aim of the Study: The goal of this research was to develop a robust hybrid approach for identifying malicious and insecure URLs derived from QR codes, ensuring safe interactions.
This is achieved through:
Machine Learning Model: Predicts the likelihood of a URL being malicious.
Security Validation Functions: Ensures the derived URL has a valid certificate and proper URL format.
This innovative blend of technology aims to enhance cybersecurity measures and protect users from potential threats hidden within QR codes 🖥 🔒
This study was my first introduction to using ML which has shown me the immense potential of ML in creating more secure digital environments!
A Deep Dive into ScyllaDB's Architecture
This talk will cover ScyllaDB Architecture from the cluster-level view and zoom in on data distribution and internal node architecture. In the process, we will learn the secret sauce used to get ScyllaDB's high availability and superior performance. We will also touch on the upcoming changes to ScyllaDB architecture, moving to strongly consistent metadata and tablets.
[OReilly Superstream] Occupy the Space: A grassroots guide to engineering (an...
The typical problem in product engineering is not bad strategy, so much as “no strategy”. This leads to confusion, lack of motivation, and incoherent action. The next time you look for a strategy and find an empty space, instead of waiting for it to be filled, I will show you how to fill it in yourself. If you’re wrong, it forces a correction. If you’re right, it helps create focus. I’ll share how I’ve approached this in the past, both what works and lessons for what didn’t work so well.
"Frontline Battles with DDoS: Best practices and Lessons Learned", Igor Ivaniuk
At this talk we will discuss DDoS protection tools and best practices, discuss network architectures and what AWS has to offer. Also, we will look into one of the largest DDoS attacks on Ukrainian infrastructure that happened in February 2022. We'll see, what techniques helped to keep the web resources available for Ukrainians and how AWS improved DDoS protection for all customers based on Ukraine experience
Dandelion Hashtable: beyond billion requests per second on a commodity server
This slide deck presents DLHT, a concurrent in-memory hashtable. Despite efforts to optimize hashtables, that go as far as sacrificing core functionality, state-of-the-art designs still incur multiple memory accesses per request and block request processing in three cases. First, most hashtables block while waiting for data to be retrieved from memory. Second, open-addressing designs, which represent the current state-of-the-art, either cannot free index slots on deletes or must block all requests to do so. Third, index resizes block every request until all objects are copied to the new index. Defying folklore wisdom, DLHT forgoes open-addressing and adopts a fully-featured and memory-aware closed-addressing design based on bounded cache-line-chaining. This design offers lock-free index operations and deletes that free slots instantly, (2) completes most requests with a single memory access, (3) utilizes software prefetching to hide memory latencies, and (4) employs a novel non-blocking and parallel resizing. In a commodity server and a memory-resident workload, DLHT surpasses 1.6B requests per second and provides 3.5x (12x) the throughput of the state-of-the-art closed-addressing (open-addressing) resizable hashtable on Gets (Deletes).
AppSec PNW: Android and iOS Application Security with MobSF
Mobile Security Framework - MobSF is a free and open source automated mobile application security testing environment designed to help security engineers, researchers, developers, and penetration testers to identify security vulnerabilities, malicious behaviours and privacy concerns in mobile applications using static and dynamic analysis. It supports all the popular mobile application binaries and source code formats built for Android and iOS devices. In addition to automated security assessment, it also offers an interactive testing environment to build and execute scenario based test/fuzz cases against the application.
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Using MobSF for static analysis of mobile applications.
Interactive dynamic security assessment of Android and iOS applications.
Solving Mobile app CTF challenges.
Reverse engineering and runtime analysis of Mobile malware.
How to shift left and integrate MobSF/mobsfscan SAST and DAST in your build pipeline.
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Presentation1
- 1. INPUT PROCESS OUTPUT VISUAL BASIC RS 232 CIRCUIT TRANSMITTER RECEIVER LED PADA RAK SUIS PADA RAK PIC 16F877A
- 2. START VISUAL BASIC MENGHANTAR DATA PADA PIC PIC MENGENAPASTI KOD YANG DIHANTAR TRANSMITTER HANTAR KOD SECARA WIRELESS RECEIVER MENERIMA KOD TERSEBUT LED MENYALA MENGIKUT DATA YG DIHANTAR SWITCH MENERIMA SEBARANG INPUT DARI BUKU? END YA TIDAK SUIS MENGHANTAR ISYARAT ISYARAT DARI VB? YA TIDAK VISUAL BASIC MEMAPAR STATUS BUKU
- 3. INPUT PROCESS OUTPUT Smoke detector PIC 16f877A RS232 To TTL circuit GSM modem
- 4. END GSM MODEM INITIALIZE GSM MODEM READY SMOKE SENSOR TRIGGER SMOKE? YES NO PIC RECEIVED SIGNAL PIC SEND DATA “ AT+CMSS=1” GSM MODEM RECEIVE COMMAND AND SEND MESSAGE AT STACK 1 HANDSET RECEIVE SMS start
- 5. INPUT PROCESS OUTPUT RF transmitter PIC 16f877A 3 pin plug LOAD RF receiver
- 6. start Remote Di tekan? YA TAK Litar receiver Menerima data Mikrocontroller Mengenalpasti suis Yang ditekan Relay Dihidupkan LOAD dihidupkan end
- 7. INPUT PROCESS OUTPUT Mangnetic Contact PIC 16f877A RS232 To TTL circuit GSM modem RFID reader Relay motor
- 8. END GSM MODEM INITIALIZE GSM MODEM READY Magnetic contact Trigger intruder? YES NO PIC RECEIVED SIGNAL PIC SEND DATA “ AT+CMSS=1” GSM MODEM RECEIVE COMMAND AND SEND MESSAGE AT STACK 1 HANDSET RECEIVE SMS start RFID detect Right card? NO YES Door open Delay 5 second YES Door closed