...and the peers make a request to the server with the roomID in the url. RoomID will be put in the same room and they start streaming video and audio. But it's too insecure and I need to generate a diffie hellman key pair on each peer (both desktop and mobile) and exchange the public keys. But I could not figure out how DH key exchange works. And where the keys are stored in mobile and how I can access them from the mobile phone so that I can encrypt the audio with the phones public key and then on the phone i can decrypt it using the key. （需要做的是为我在webrtc服务器上直播视频和音频的现有项目增加DH密钥交换算法的功能。 我原来的项目代码是录音web端和手机端的音频，并将它们进行比较延迟，作为两个端是否是在同一环境的双因素身份验证。我要改进的是使用webrtc直播音频来比较它们，把录音这一步替换掉。 我已经做好了的是部署webrtc信号服务器和可以直播视频和音频的url链接。现在连接的运作方式是，我用一个roomID创建一个房间，然后用户群用url里的roomID向服务器发出请求。RoomID会被放在同一...
... In addition to providing security related to the centralized financial ecosystem, it also provides the best of both worlds advantages, providing all the cost-effectiveness, easy access, transparency and rapidity of defi income agriculture Moon farm optimizes the yield agriculture interest (apyi APR) and provides users with the ability to choose the farm they want to use. Otherwise, the system will automatically use the yield optimization engine to determine the best farming strategy. Our vision: Become a leading platform for yield optimization of cedefi; Bridge the gap between cefi and defi; Eliminate the access threshold of planting industry and improve the user experience; Provide better utilization of funds; Create powerful optimizations to provide the best interests f...
A calendar applet with multiple features, including time booking, team collaboration, shared calendars, online subscriptions, and more. Requirements: 1. Must have a deep understanding of the booking 2. Must be familiar with the common calendar application 3. Must have a deep understanding of teamwork and access control 4. Must be familiar with WeChat / applet / public number 一 个具有多种功能的日历小程序，包括时间预订，团队协作，共享日历，在线订阅等。 要求： 1. 必须对预订有深刻理解 2. 必须熟悉常见日历应用 3. 必须对团队协作，权限控制有深刻理解 4. 必须熟悉微信/小程序/公众号
1.在access选项卡下增加购买栏，后台可以输入金额，前台用户访问页面时支付相应金额以后可以访问内容； 2.用户可以自己购买用户组，用户支付一定的金额，可以在一段时间内成为某一个用户组成员 3.支付方式包含支付宝和微信支付（扫码、链接等都需要支持） 4.详细说明请查看附加文件
你好: 我要開發一套門禁系統與監控系統，人員不須到現場協助客戶看屋。 請參考以下網站 開發類似這套系統。 與開發 的網站做應用 請問您可以開發嗎? I want to develop a set of access control systems and monitoring systems, personnel do not have to go to the scene to help customers see the house.
我現在有一個以visual foxpro 編寫的軟件，它會自動從網上下載資料並儲存在電腦中，透過軟件的介面顯示所需資料。現在的項目想將下載並儲存在電腦的DATA擷取到EXCEL/ACCESS，從而不用透過FOXPRO 編寫的程式也可以利用EXCEL/ACCESS 作查詢。由於軟件的介面是中文，所以必需懂得中文才可以完成這個項目。
我们目前有一个基于Windos Access 的一个内部应用软件， 我们希望能将其用WINDEV 来重新开发 以便于我们之后的应用。指定使用WINDEV 开发软件。在我们公司坐班工作，直到项目完成。
1. App download to allow user to access the internet thru our company servers.. 2. GEO Location of device for clients when they enter the office building to know where they are. 3. Building lay out, with using scan QR codes to let clients know where they are at precisely 4. USING wifi, A-GPS and GPS to access location INSIDE the building and on different floors 5. Allow downloading of pamphlets and documents helps references for services provided in the entire 10 story building along with each specific floors 7. Will need ongoing support for at least 1 year, 8. Within the app, the layout for the client changes and makes changes based on the wifi positioning. 9. Smart app controller, allowing the app to control simple internet connected items (lights, switches) will ...
Requires a database that helps users in our company to organise different packaging specifications for each of our products. Since different customers require different packaging format of the same products, we need to be able to pick from existing packaging format or create new format for each customer. Requires the following functions. 1) Product overview (list all the items, and related different packaging specifications) 2) Functions that allow users to alter and add new packaging format for each item. 3) Functions that allow users to pick different products (and its respective forma) and output the selection to Excel or PDF 4) An import and export function that allows us to import all the existing packaging data into the database.
项目： - 一个牙医软件模块； - 部分功能基于开源控件实现； - 开发环境为C#, MSSQL Server, MS Access (MDB)； - 1.1 版本已经完成并在使用； - 现按照用户要求有所改动； - 改动分为2个阶段，1.2版本和2.0版本； - 1.2版本预计一个月内完成； - 2.0版本预计二个月； 要求： - 熟识C#，.NET， MSSQL，MS ACCESS； - 使用第三方控件经验； - 懂看简单英文需求； 项目本身是加拿大外包的，我人在东莞，可以到我这里开会，也可以到深圳开会，让你了解该程序和其需求以便报价。 有兴趣的，请QQ 1073158942 联系，或电 15820998667 （何生）
1. 设计及建立公司内部网站（登录访问），主要信息包括各部门主要架构、流程及手册，同时包括最新公司动态，行业信息等。信息披露分层，二层不超过10页，三层以上不超过30页。简单的网页间连接。同时包括一个内部Forum （论坛）可以让员工共享相关行业及知识信息。 2. 在同一网站上建立一个内部应用系统加数据库，主要流程涵盖客户记录及贷款状态录入及更新。数据库不超过10个表, 每个表大概10-20个字段，主数据每月新数据不超过500条记录，总数据量大概每年新增50000条。 数据库机构初步包括：客户表、介绍人表、佣金表、新交易表、交易历史记录表等。 应用系统主要功能是录入、查询及产生报表。 安全考虑上可以根据访问人员的ID呈现可以访问的界面及相关报表。 3. 希望网站建设可以使用较简单的HTML5、Access数据库设计，以方便未来的自行维护。 4. 全部网页为英文。
1.要識中文,善於溝通 2. Access 基本運作 (關聯圖,報表,表單等等) -要將所有資料整理及關聯,方便我們尋找客人的資料 -要按我們需要及要求製作表單和報表 -需要各負責人交代有關運作及其用途
... 利润最大化通过开发和制作百度,搜狗,360显示广告,规划和部署PPC活动。 -赢得优质的、显著的PPC项目进展。 -通过PPC或付费点击追踪、更新跟踪和更新流量模式。 -负责PPC报告，包括每周和每月项目报告，分析该项目的表现，评估投资回报率对关键指标和优化支出的最大价值。 -培训营销人员，监督各项目进展，以确保团队的优质表现。 -参与或主持高级管理层及营销团队的会议。 -发掘、聘用、指导和激励线上营销人员在技术及应用层面发挥最大潜能。 技能与经验要求： -良好的教育背景。 -渴望成功。 -拥有5年以上的任职PPC经理/百度网盟专家的经历。 -有参与SEM竞标技术、自动化功能的经验。 -善写广告文案，懂得就项目进行专业层面的比较。 -能够管理、指导大批富有经验的团队成员工作。 -有从众多数据中获取信息、做出清晰判断与明智角色的经验，善用Excel与Access. -优秀的客户处理能力和书面、口头沟通技巧。 -杰出的项目管理能力，能同时管理多个项目，并确保项目按时运作。 -能够适应瞬息万变的线上营销趋势。 -能够萌生新创意、执行新想法。 -能够从头至尾地带领、管理并参与任一项目。 -富有职业道德及旺盛的精力。
Access 2013 Web App 在线的顾客管理系统。用户登录后在主页看每日摘要： 1.近一个月内新加入的顾客 2.正在处理中的顾客列表 3.总顾客数量 点击添加新顾客按钮可以弹出窗口添加新顾客 点击顾客名可以弹出顾客详细信息，并可以打印该详细信息
I'm in need of a professional video for my website. The goal is to introduce my website features in a clear and informative manner. Key requirements: - Screen recording with voiceover: The video should be a screen record...voiceover: The video should be a screen recording of my website, with a professional voiceover guiding the viewer through the various features and functions. Ideal skills and experience: - Experience creating similar videos for websites or software products - Strong scriptwriting and storytelling abilities - Proficiency in video editing and post-production - A professional voiceover artist or access to one Please provide references or examples of similar work you have done in the past. This will give me a better idea of your capabilities and suitability fo...
...organized and saved into a customized Excel template. Additionally, the system should be designed to assign different user IDs with varying levels of access control. Key Requirements: - Develop an AI portal with the capability to extract table data from PDFs. - Organize and save the extracted data in Excel using customized templates based on the source PDF. - Implement a user management system that assigns different access controls to various user IDs. Ideal Skills and Experience: - Proficient in AI development and data extraction techniques. - Expertise in Excel automation and customization. - Strong background in user management and access control systems. - Previous experience with similar projects is a plus. The successful freelancer will be able to demonstr...
we have an old iOS App that didn't got updated for some years and we don't have a SWIFT-Developer anymore. using FCM legacy some parameters have been written to a custom sub-object in the JSON and this seems not to be supported anymore. it's really not possible anymore? so I moved all parameters to the root-level and no we have to update the App so this paramete...really not possible anymore? so I moved all parameters to the root-level and no we have to update the App so this parameters get processed again (receiving notifications work well in general, just the action-parameters are missing) the challange: I currently can't send Notifications to the Simulator so it's not possible to debug notifications and I'm not allowed to share the code so I can only give ...
Project Description: We are seeking a skilled freelancer to help us capture high-quality screenshots and record demonstration videos of our mobile app for both Google Play and the Apple App Store. The freelancer should have access to both Android and iOS devices to perform the tasks effectively. Requirements: Screenshots: Android: Capture 10 high-quality screenshots showcasing all key functionalities of the app. iOS: Capture 10 high-quality screenshots for each device size: iPhone 6.7" iPhone 6.5" iPhone 5.5" iPad 13" iPad 12.9" Screenshots must be taken directly from each device; resizing from other screenshots is not acceptable. Ensure all screenshots comply with the guidelines of both Google Play and the Apple App Store. Screenshots should highlight the...
I am searching for a skilled network specialist to help with various tasks related to my Unifi network setup. Key tasks include: - Installing three or more access points - Configuring specific network settings, encompassing DHCP settings, VLAN settings, and Firewall settings - Troubleshooting any potential connectivity issues Ideal candidates should be highly experienced with Unifi products, adept at network configuration and problem-solving. Your experience with DHCP, VLAN, and Firewall settings will crucially contribute to the successful completion of this project.
...some data into every new tab that opens. You can create new identities with ghost browser and give them a name. When the new tab opens in the new identity one of ghost browsers plugins injects an array of data. into the page and can be viewed in the console. I'd like to extract the ID, Name and Color values that it injects and store them in my chrome plugin but haven't been able to successfully access. Building the plugin I'm ok with but need help accessing these values. Here is the array that gets injected into each tab: { "active": {}, "bypassed": false, "info": [], "identityInfo": { "color": "BC789C", "creation_time": "2024-05-22T00:22:14.031Z", "id": ...
I'm in need of an ex...Conducting research and preparing reports Experience and Qualities Desired: - Proven track record as a virtual assistant, ideally to C-level executives - Strong organizational skills, with the ability to manage multiple tasks simultaneously - Excellent communication and interpersonal skills, to effectively liaise with team members and clients - Capability to work independently, in accordance with full access to confidential information - Proficiency in the usage of various communication channels including email, phone calls, and instant messaging/chat platforms The right freelancer for this role will be a proactive individual, capable of not only executing tasks but also suggesting improvements and strategies to facilitate more efficient and effective ...
I'm looking for an experienced domain broker who can help me acquire a premium domain urgently. Key Requirements: - The domain in question is a premium one, so experience in handling high-value domain transactions is a must. - You should be well-versed in the intricacies of domain sales, able to identify the right opportunities and negotiate effectively. - Your network and access to premium domain sellers is crucial for a quick turnaround. - While I have not specified the primary goal for this acquisition, a broker who can guide me in aligning the domain with brand recognition, SEO advantage, or a speculative investment would be an added advantage. Timeframe: - This is an urgent requirement and thus, I'm looking for someone who can broker this acquisition for me as ...
...Design Requirements 1. User Management -User Registration/Login: Separate workflows for candidates and companies. Each form should gather specific information as per the provided documentation. Design should clearly differentiate between these two processes. -Email Verification & Secure Password Management: Interfaces for email verification links and secure password reset options. -Role-Based Access Control (RBAC): Interfaces that reflect different user permissions for candidates, companies, recruiters, and admin roles. -Multi-factor Authentication (MFA): Design a toggle option in user settings for enabling MFA, and the authentication sequence involved in the login process when MFA is enabled. 2. Profile Management -Candidate Profiles: Design comprehensive digital resume...
in your Bid, clearly answer this questions: 1. how many years of experience do u have? 2. Are you an independent freelancer? 3 do you know how to fix sql injections? - Give 2 example of how to...implement it so that it doesn't have load on server and page doesn't hang? 7. Have you worked on any multi-user platform, or social networking platform - can you share with me some of your customized applications that u have worked on? Please note: for question 4 and 5 we have all the checks in place for the payment such as phone verification, email verification, env file is protected with no access by public, still spamming charges happening and still email spamming happening. How can you protect it more to stop spammers getting hold of the apis? What will be your approach ...
I need an AI agent script that is browser based without a local computer install that will do two things. 1. Research current job postings on various job platforms based on my keywords and gather any emails as well and 2. Gather email for those related postings that did not have the emails in the posting by researching the agents. So these are eit...need the output in a csv file with the name of business, job posting link, job category, name of contact if exists email address, phone number if exists. I only want the line saved if there is an email address. Again, I want something I can run from a browser without having to install python or anything in my computer. Please give a price for completing this project. If necessary I can provide access to a server if needed or to one of...
I am on the lookout for a researcher who can access and scan articles from a specific arabic language journal held in the Bibliothèque nationale de France. The journal was published in France. I have confirmation that it is held there. (Removed by Freelancer.com Admin for offsiting - please see Section 13 of our Terms and Conditions)
I'm looking for an experienced software developer to create an AI recruiting software tailored for the...Matching: A system to match keywords in resumes to job requirements - Machine Learning Algorithms: An algorithm to predict candidate suitability based on historical data Platform: - Web-based: The software should be accessible via any web browser for ease of use and accessibility - Mobile App: A mobile application should also be developed alongside the web version to allow recruiters and candidates to access the service on the go. Ideal skills for this project include: - Proficiency in AI and machine learning algorithms - Experience in recruitment software development - Knowledge of LMS and healthcare recruitment practices - Ability to create a user-friendly web interface...
I am seeking a skilled Swift iOS developer who can create an innovative, user-friendly application for managing driving routes via GIS .shp files. Key Features: 1. Import GIS .shp files and convert them into driving ...1. Import GIS .shp files and convert them into driving routes. 2. Incorporate a web portal feature to assign and track drivers. 3. Real-time updates on the progress of each route. The ideal freelancer for this project should have experience with Swift, iOS development, .shp file manipulation, and incorporating real-time updates into an app. The app also needs a mobile version for drivers to access their routes; therefore, experience with mobile app development is also desired. More specifications will be provided upon selection. Looking forward to a fruitful pa...
I'm in need of an architect to design a modern style triplex villa. The total area is 110 square meters and the project is expected to be a contemporary, sophisticated a...means ensuring there's a balance between communal areas and private spaces. - Incorporating key features such as a private garden or terrace, multiple balconies and rooftop access. These features are essential and should be integrated seamlessly into the design. Ideal candidates for this project should: - Have a strong portfolio of modern architectural designs - Possess experience in designing triplex villas and with a mix of open plan and separate rooms - Demonstrate creativity and innovation in the use of space - Be able to understand and incorporate essential features like private garden, balconies,...
...$399/month) 20% commission on the monthly revenue generated by Tier 3 clients (client pays $599/month) Bonus Structure: $250 bonus when a client reaches 3 months $500 bonus at 6 months $1,000 bonus at 12 months Earnings Potential: Our top performers can earn $1,500 - $3,000+ per month within the first few months. The more clients you acquire, the higher your passive income grows. Tools Provided: Access to cutting-edge lead generation tools Sales scripts, email templates, and resources to streamline your outreach Responsibilities: Identify and reach out to potential clients through targeted campaigns Conduct research to build prospect lists and identify decision-makers Deliver compelling sales presentations showcasing our value proposition Close deals and onboard new clien...
As a client, I have full access to the financial statements and data required for this project. I am seeking a proficient professional who can conduct a comprehensive valuation for a listed company using three different models; Discounted Cash Flow (DCF), Gordon model, and residual income. The project should be conducted with a 5-year timeframe in mind. Key Deliverables: - Thorough valuation of a listed company using DCF, Gordon model, and residual income - Clear and well-structured report detailing the results and rationale of the valuation - Analysis that corresponds to a 5-year timeframe Ideal Skills and Experience: - Strong financial analysis background with experience in valuations - Expertise in using DCF, Gordon model and residual income for company valuation - Ability to ...
I am in need of a professional website developed to showcase my academia-focused content. The site should be specifically designed to highlight my research publications. Key Features: - Display of Research publications: These should be presented in a clear, easily navigable way. Each publication must have its abstract summary and a link to access the full text PDF. - Organization: The publications should be organized by research topic, allowing visitors to quickly navigate to their areas of interest. Ideal skills for the job: - Web Design: You should have a portfolio demonstrating your ability to create professional, clean, and user-friendly sites. - Content Management: Familiarity with content organization is crucial, specifically in handling academic or research materials. Over...
...looking for the product to then be purchasable following that quotation following a sign up process and agreement to terms and conditions. Customer will then automatically be sent an email welcoming them to the product and will include policy details. I will need functionality to bill customers monthly using card payment and to include a cancel anytime option. I absolutely need free-flow access to the site and the ability to make frequent changes. Therefore upon completion I will be looking to employ the designer for regular maintenance and change updates throughout the lifetime of the site. When up and running I would look to communicate mainly through whatsapp for ease of communication. A crucial requirement is for my designer to speak very good English please. K...
I need an experienced web scraping expert who can help me scrape relevant data from a specific website on a daily basis. Key Details: - I'm looking for data in text format including headlines, product descriptions, and any other relevant information available on the site. - There is no requirement for authentication to access the data, so the process should be straightforward. - The extraction needs to happen daily, so you should be able to set up a recurring scraping process. Skills and Experience: - Proficiency in web scraping tools and techniques. - Experience in extracting text data from websites and setting up automated daily scraping routines. - Good understanding of data formats and storage to deliver data in a usable format. I'm looking for a reliable and effic...
I need a simple web application developed using the Scriptcase platform. The main functionality of the project will be integrating a database into the application. This will include data for user profiles and product listings. Key Requirements: - Development experience with the Scriptcase platform is a must - Proficiency in PHP and web application development - Experience in integrating da...for user profiles and product listings. Key Requirements: - Development experience with the Scriptcase platform is a must - Proficiency in PHP and web application development - Experience in integrating databases into web applications Other Details: - The application must be user-friendly and intuitive - No specific user roles or permissions are required, all users will have the same level of a...
...compatibility with mobile devices. 5. Integration and Testing o Integrate the frontend with the backend APIs. o Perform comprehensive testing to ensure data accuracy and system stability. o Test the application across different browsers and devices to ensure compatibility. o Also need a mobile application for iOS and android 6. Deployment o Deploy the dashboard on a web server. o Ensure secure access and backup mechanisms. 7. Maintenance and Support o Provide documentation and training for users. o Offer ongoing support and updates as needed. Example Workflow 1. User Login: Secure login for accessing the dashboard. 2. Dashboard Home: Overview of key metrics and quick links to detailed reports. 3. Sales Reports: o Select date range (daily, monthly, annual). o V...
...create advanced formulas, and design visually captivating presentations, this contest is tailored for you! Join us in revolutionizing property portfolio management with a document that sets the standard for clarity, accuracy, and usability. I would like to be able to edit if required in the future therefore 2 copies will be required. 1 being password and field protected and the other with full access for any required changes. **Requirements:** **Tab 1: Welcome & Data Collection** *Design and User Interface:* - Create an inviting and user-friendly interface that reflects our professional standards, incorporating the company logo colours (blue, white, grey). - Ensure intuitive navigation and seamless data entry for clients of varying technical abilities. Buttons for each
I need a virtual assistant to assist wit...Responsibilities: - User Registration: You will be responsible for ensuring that new users are accurately registered in our admin panel. - User Data Management: You will help in managing and updating user data as required. - User Account Activation: Your role will involve activating user accounts within the system as needed. Our on-boarding system is managed through an admin panel that we will provide you access to. It's vital that you're comfortable navigating through online systems and software. Skills and Experience Required: - Proven experience in administrative support - Familiarity with user registration and data management - Solid grasp of online systems and software, even better if you're familiar with admin panels ...
I'm in need of a PowerBi expert to resolve a critical error for me. The error message reads: "Failed to save modifications to the server. The error returned: 'Relationship '5...table 'Bridge of Setter'." - Urgency: The task should be completed within 24 hours. - Documentation: I don't need any documentation on how the issue is resolved, just the solution itself. - Dataset Access: Unfortunately, I can't provide access to the original dataset. The expert will need to resolve the issue without it. Skills and experience required: - Proficient in PowerBI with experience in resolving server-related errors. - Ability to work under tight deadlines and deliver work promptly. - Good communication skills are essential, as the job requires u...
...is solely geared towards educating adults. Key Project Details: I wanted a mobile app that I can upload my some content like videos and written text that my client can go through and consume the content and they get a reminder of the next appointment and also some of the exercises that they need to do between a visit. I want the app to have a membership and username and password for members to access - Development Platforms: The app should be designed to work seamlessly on both iOS and Android devices. - Educational Focus: The primary goal of the app is to deliver educational content, so a background in creating educational apps is a plus. - Target Audience: The app is intended for adults, so the interface and content must be appropriate and engaging for this demograp...
I'm in need of an experienced developer to create a MERN stack website for me. The key features and requirements for this project include: - **User Authentication**: The website must include a robust user authentication system for visitors to create accounts, log in, and access personalized pages. - **Email Verification with OTP**: The user verification process will be handled by sending a 4-digit OTP to the user's email address. The visitor will need to verify their email to access the personalized pages of the website. - **Onboarding Form**: I need a user onboarding process to guide new users through filling an onboarding form with their details after their initial login. Ideal Skills and Experience: - Proficiency in MERN stack development (MongoDB, , React, No...
I'm seeking a developer with extensive experience in integrating Hubspot chat widget into Laravel PHP projects. This task requires you to install the chat widget for the entire website. Key requirements for this project include: - Proficiency in Laravel PHP - Expertise in Hubspot chat widget integration - Familiarity with SFTP server access and tag code insertion Your responsibilities will include: - Installing the Hubspot chat widget on my Laravel PHP project - Ensuring the chat widget is functional across the entire website Given the nature of the task, I need someone who can deliver efficient and quality work within a reasonable timeframe. If you have prior experience with similar projects, please provide examples in your bid.
I need someone proficient in data entry to help me with a project - If you are overseas, please have a PREMIUM VPN setup to access website in Canada Thank you for your interest.
I'm seeking a skilled WooCommerce specialist to enhance the performance of my 4 single-product sites. The main issue that needs to be addressed is the slow loading times. Key Details: - There a...Key Details: - There are 4 identical websites (for different markets), each with approximately 5 pages along with legal pages. Requirements: - Experience with optimizing WooCommerce websites is essential. - Proven track record of significantly improving website load times. - Understanding of international audience and its implications for optimization. Access: - You will be provided with WordPress admin access and hosting account access. Timeline: - I need this project completed ASAP. Please only apply if you have a strong background in WooCommerce optimization ...
I'm seeking an experienced C++ developer to create an effective Parallel File System based on the Google File System (GFS) - a system we'd like to dub as miniGFS. This project seeks to achieve: - Efficient storage and access of large files: The miniGFS should handle large data quantities seamlessly, allowing both read and write operations swiftly. - Data replication and fault tolerance: This project prioritizes data integrity and availability, necessitating a system designed for data replication and recovery in the occurrence of a fault. - Parallel processing: Optimum speed during file operations can be achieved through parallel processing functionality and the miniGFS should capitalize on this. - Data distribution across multiple nodes: To ensure efficient space use ...
I'm looking to transform my Linux laptop into a hosting server to sell hosting plans. I will provide root access for setup and maintenance, so you'll have full control to configure and manage the server. I prefer using cPanel as the hosting control panel for managing hosted sites. The main tasks and requirements for this project include: - Setting up the laptop as a hosting server - Installing and configuring cPanel - Advising on any additional software or configuration needed to make the hosting business-ready - Ensuring the server is secure and properly maintained Ideal applicants will have experience in: - Linux server administration - Setting up hosting environments - cPanel and web hosting control panels - Network and server security
