Ασφάλεια Υπολογιστή Jobs

Implement full router hardening on new MikroTik CCR2116-12G-4S+ and its two access points plus two switches. Includes: * Setting up VLAN segmentation to fully separate the Work / Home Office network from the Personal / Home network both IPv4. * Configuring WPA3-Enterprise authentication on the wifi access points. * Enforcing strict inter-VLAN firewall rules for complete isolation while allowing both networks full internet access. * Strong firewall rules for public IP access and any security recommendations * Intrusion detection and easy to read email alerts * Delivery includes network diagram and documented configuration.

I need GenieACS installed, secured, and fully tuned to manage Airtel Xstream routers in production. The deployment must let me: • Register and remotely manage devices • Push firmware upgrades without manual intervention • Monitor performance metrics in real time • Apply custom IP pools, VLAN tagging, and QoS rules directly from the ACS interface You are free to choose the operating system and database you are most comfortable with; just document every step clearly so I can reproduce it on another machine. A clean web UI, working API calls, and successful provisioning of at least one Airtel Xstream unit will serve as acceptance criteria. Cloud or on-prem hosting is fine as long as latency remains low and security best practices (TLS, strong credentials, firewa...

I run my workload on a single Compute Engine instance and I’m urgently looking to tighten security after a recent unauthorized-access event. The immediate priorities are: • Lock down the instance: review and update firewall rules, service accounts, IAM roles, OS-level settings, and any exposed ports. I expect clear recommendations (e.g., Cloud Armor policies, VPC Firewall tweaks, OS patching) and implementation where feasible. • Trace the breach: pull the relevant Cloud Logging records, VPC flow logs, and any SSH / RDP audit data to build a timeline showing when the intrusion occurred, the source IPs, and actions performed. Deliver the raw export plus a concise report so I can hand it to management. • Prevent recurrence: enable or improve ongoing monitoring—Se...

The goal is to identify vulnerabilities, activation bypass methods, weak points in the protection logic, and possible security flaws so they can be fixed and improved. This is for defensive and internal security testing purposes only. I am NOT requesting illegal cracking of third-party software. Requirements: Experience with Windows desktop applications Reverse engineering and software protection knowledge Understanding of licensing / activation systems Ability to document findings clearly Suggestions for improving protection and security Optional: Experience with anti-tamper / anti-debugging systems Experience with C++, C#, .NET, WinAPI, or low-level Windows internals Please include: Previous related work or portfolio Estimated timeline Your hourly rate or fixed price Thanks!

Senior Zscaler engineer needed to guide me over the shoulder while I rebuild the foundational pieces of our ZPA/ZIA setup. I drive the consoles; you advise in real time and explain the why behind each setting. Context: A current implementation works but isn't scalable, security-focused, or aligned with best practice. Goal is to reset the foundation so those problems don't carry forward, built to a strong security bar, with a structure that scales cleanly across employees, contractors, admins, and third parties without rework. Constraint: Okta SSO is operational and out of scope. ZIdentity group/role binding is on a separate track. Work fits around both. In scope: - Hardened pre-auth machine tunnel with the strongest realistic device trust model - Least-privilege pre-logon acc...

I need a certified cybersecurity professional to determine whether my personal Android phone has been subjected to unauthorized access and to help me regain full, lawful control of every component that may have been touched. The device is the only confirmed target right now; however, if traces lead to email or social channels I will widen the scope with you. Your investigation must be forensically sound so that any evidence you uncover can stand up to scrutiny should I decide to take legal action. I am expecting a hands-on approach that covers log collection, malware/spyware scanning, vulnerability mapping, and clear recommendations on how to close every gap you find. Where recovery steps are needed—password resets, two-factor reconfiguration, data restoration—I want you ...

I need an expert to respond to a Trojan malware infection. Key Requirements: - Identify and contain the infection - Remove the Trojan and secure the network - Provide a detailed incident report - Recommend preventive measures for the future Ideal Skills and Experience: - Strong background in incident response - Expertise in dealing with Trojan malware - Relevant certifications (CISSP, CEH, etc.) - Proven track record of successful malware removal

I run a home network built around a set-up of routers and switches and I need a seasoned network engineer who can keep everything running smoothly month after month. The routine includes inspecting the devices for firmware, cabling or configuration issues, catching early signs of bottlenecks, and stepping in quickly when slow-downs, drop-outs or other connectivity glitches appear. Alongside the day-to-day troubleshooting, I want the LAN and Wi-Fi tuned for best stability and speed, plus a light but regular security sweep to spot obvious vulnerabilities and patch them before they turn into problems. Most tasks can be handled remotely, but if you prefer or the situation demands it, let me know your availability for occasional on-site visits. Fast, clear communication is essential so I&rsq...

I run an EU-registered consultancy delivering cybersecurity services to mid-market and enterprise clients in France and broader Europe. I'm building a roster of cybersecurity engineers I can engage on a recurring basis as client missions come in — not a one-off project. What I'm looking for : A cybersecurity engineer (mid-level acceptable, 3+ years hands-on) able to deliver vulnerability assessments and penetration tests on: - Network infrastructure (internal/external) - Web applications (OWASP Top 10, API security) - Cloud environments (AWS, Azure, or GCP — at least one) Required : - At least one recognized certification: OSCP, CEH, CompTIA PenTest+, or equivalent (please state which in your bid) - Hands-on experience with Nmap, Burp Suite, Metasploit, OWASP ZAP, a...

A recent malware incident on our server has left several database files renamed with a “.p2k” extension and rendered unreadable. These files hold mission-critical operational data and, unfortunately, there are no usable backups to fall back on. I need an experienced specialist who can: • Analyse the infected samples, identify the exact encryption or packing method the malware used, and safely extract or reproduce any required keys. • Restore every affected .p2k file to a fully functional database format that can be opened in its original application. • Document the full recovery workflow so we can repeat the process should more files surface and so we can harden the environment against reinfection. Acceptance criteria • At least one damaged file is r...

I’m building an automated model that scans Solidity code on the Ethereum network and flags three critical weaknesses—reentrancy, arithmetic overflow/underflow, and access-control flaws. What I need from you is a working detection engine: it can be rule-based, machine-learning, formal-verification driven, or a hybrid, as long as it reliably pinpoints those issues in typical ERC-20/721 style contracts and produces a clear, human-readable report. I’ll provide sample contracts (both vulnerable and safe) so you can tune precision and recall; feel free to augment with publicly available datasets such as SWC Registry examples. Because this is Ethereum-only work, please focus on Solidity syntax quirks, common library usage (OpenZeppelin), and the nuances of the EVM. If you le...

Passwords keep rejecting for each new sign in. Wifi dropping and slow. Att 2.0, one machine, lite programs. problems with my mouse. just funny businesss all the way around. I made 6 figures this month and I believe a roommate to be leaching for info to ride my plays. Help. Sent to a local IT outfit: Hey there. Heather here. I have an issue I need immediate help with. I made 50k last month and I have a roommate lurking lurking around the house trying to get close to me or whatever. I can her multiple voices reading aloud what I’ve written on my screen or send in a message from here or my phone. Bought a new MacBook yesterday. Asked my roommate to go get it. I paid online and he went to get it it’s just three miles away. I don’t drive and had offered to pay him to run...

I need a thorough security audit that examines our network perimeter, our internally-developed web and mobile applications, and the policies we rely on to stay aligned with compliance and governance standards. The goal is to obtain a clear, evidence-based view of where our current controls succeed, where they fail, and which vulnerabilities demand immediate remediation. Here is what the engagement should cover: • Network security – vulnerability assessment, configuration review, segmentation and firewall rule analysis • Application security – code-level and runtime testing aligned with OWASP, including authentication, data handling and session management checks • Compliance and governance – gap analysis against the relevant framework (ISO 27001, NIST ...

I’m facing recurring connectivity and performance issues across my small-office network and need a technician who focuses specifically on network support to step in quickly. The job is entirely remote: you’ll connect to my environment, pinpoint the root cause of dropped connections and sluggish speeds, and then apply a clean, documented fix. Here’s what I expect: • A thorough diagnostic session covering routers, switches, and current cabling layout (where traceable from afar). • Implementation of configuration changes or firmware updates that restore stable throughput. • A concise report outlining the problem, the steps you took, and any preventive recommendations. Experience with common SMB hardware (Cisco, Ubiquiti, MikroTik, or similar) and standa...

I need an experienced ethical hacker to dive deep into my web application and pinpoint any security weaknesses before they can be exploited in the wild. The sole objective is to identify vulnerabilities, not to gain or provide unauthorized access for malicious purposes. You’ll have full permission to run a comprehensive penetration test against the live site (or a staging clone, if you prefer). Feel free to use the tools you trust most—Burp Suite, OWASP ZAP, Metasploit, custom scripts—so long as the process is legally compliant and doesn’t disrupt service for genuine users. At the end of the engagement I expect: • A clear, well-structured report detailing every vulnerability you uncover, proof-of-concept evidence, risk ratings, and practical remediation advic...

NS-3 Network Simulation Task Project Overview I am looking for assistance with a small networking task using NS-3 which can be downloaded via: (ns-allinone-3.35 version). The goal of this task is to work with the provided simulation example and modify it to evaluate network performance metrics. The task focuses on understanding how NS-3 can be used for analyzing communication networks that include both wired and wireless connections. Required Tasks The selected freelancer should: • Modify the source file in NS-3. • Calculate and display the following performance metrics at the end of the simulation: o End-to-end delay o Throughput • Update the client node behavior so it sends more than one packet during the simulation. • Use the MakeCallback() function within th...

I want a seasoned security professional to probe my site from every angle and show me—plainly—where a hacker would slip in. My main worry is outright breaches, not just compliance check-boxes, and at the moment I only have the usual basic plugins and a standard SSL certificate in place. You’ll need to run a full vulnerability assessment and light penetration test, review server and application configurations, and evaluate any code that touches the public web. Feel free to bring out Burp Suite, OWASP ZAP, Nikto, or whatever toolset you trust; I’m interested in real-world exploitability, not generic scanner output. Please deliver: • A concise report detailing each weakness, its risk level, and clear remediation steps • A prioritised action plan I c...

I need an experienced ethical hacker to dive deep into my web application and pinpoint any security weaknesses before they can be exploited in the wild. The sole objective is to identify vulnerabilities, not to gain or provide unauthorized access for malicious purposes. You’ll have full permission to run a comprehensive penetration test against the live site (or a staging clone, if you prefer). Feel free to use the tools you trust most—Burp Suite, OWASP ZAP, Metasploit, custom scripts—so long as the process is legally compliant and doesn’t disrupt service for genuine users. At the end of the engagement I expect: • A clear, well-structured report detailing every vulnerability you uncover, proof-of-concept evidence, risk ratings, and practical remediation advic...

Our regional payment subdomain is being flagged by Google Safe Browsing and other security filters as a "potential phishing threat," preventing members from processing payments. We need a technically competent freelancer to diagnose the root cause, implement a secure subdomain solution under our primary corporate domain, and restore trust. Background Primary domain: [Corporate domain managed by headquarters] Payment subdomain: [Regional payment portal — currently flagged] Current impact: Members are discouraged by browsers to proceed, even blocked; payment abandonment is high, credibility is being lost Scope of Work Phase 1: Root Cause Diagnosis (REQUIRED FIRST) Before any fixes, you must: [ ] Scan the payment subdomain for malware, suspicious scripts, or compromise indica...

Our organisation runs a geographically-distributed Wide Area Network and I want independent confirmation that the data moving across it cannot be intercepted, decoded, or manipulated. The engagement is limited to traffic analysis and sniffing on the live WAN links; firewall rule-sets and router configurations are out of scope unless you discover something during capture that clearly ties back to them. Scope • Perform lawful, ethical interception of packet flows on agreed WAN segments. • Analyse captured traffic for clear-text credentials, session fixation, protocol misconfiguration, or other weaknesses that could lead to privilege escalation or data leakage. • Attempt non-disruptive proof-of-concept exploits only where traffic analysis indicates a realistic attack pat...

I’m facing recurring connectivity and performance issues across my small-office network and need a technician who focuses specifically on network support to step in quickly. The job is entirely remote: you’ll connect to my environment, pinpoint the root cause of dropped connections and sluggish speeds, and then apply a clean, documented fix. Here’s what I expect: • A thorough diagnostic session covering routers, switches, and current cabling layout (where traceable from afar). • Implementation of configuration changes or firmware updates that restore stable throughput. • A concise report outlining the problem, the steps you took, and any preventive recommendations. Experience with common SMB hardware (Cisco, Ubiquiti, MikroTik, or similar) and standa...

I'm looking for an experienced security expert to help address data breaches in my mobile app, which is available on both iOS and Android platforms. Key requirements: - Identify and fix vulnerabilities causing data breaches - Secure user personal data and financial information - Experience with both iOS and Android security protocols - Proven track record in preventing malware infections and unauthorized access Ideal skills and experience: - Mobile app security expertise - Background in ethical hacking - Certifications in cybersecurity (e.g., CEH, CISSP) - Strong problem-solving skills and attention to detail Please provide a detailed plan and relevant experience in your bid.