🦑

DSA is so easy when you follow these 6 steps:

𝟭. 𝗙𝗼𝗰𝘂𝘀 𝗼𝗻 𝗗𝗲𝗽𝘁𝗵 𝗼𝘃𝗲𝗿 𝗕𝗿𝗲𝗮𝗱𝘁𝗵:
- Don't solve 500 coding problems aimlessly. Master around 100 core problems deeply instead.
- 40 Problems on Array, Strings, LinkedList, Stack & Queue, Binary search, Trees, Graph, Sorting and Searching: https://lnkd.in/djnaPkeD
- 40 Problems on Dynamic Programming (DP), Backtracking, Hashing, Heap, Tries, and Greedy Algorithms: https://lnkd.in/dF3h-Khk

𝟮. 𝗖𝗿𝗲𝗮𝘁𝗲 𝗮 𝗹𝗶𝘀𝘁 𝗼𝗳 𝗸𝗲𝘆 𝗾𝘂𝗲𝘀𝘁𝗶𝗼𝗻𝘀:
- Use resources like "Strivers A2Z DSA Sheet" by Raj Vikramaditya to curate around 100 core problems.
- https://lnkd.in/dQMGy9zF (Strivers)

𝟯. 𝗠𝗮𝘀𝘁𝗲𝗿 𝗲𝗮𝗰𝗵 𝗱𝗮𝘁𝗮 𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲:
- Understand and implement them by hand. Know how they work internally to ace interview questions.
- Fundamentals, Intermediate, Advance DSA topics: https://lnkd.in/d4ws9xfr

𝟰. 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝘄𝗶𝘁𝗵 𝗦𝗽𝗮𝗰𝗲𝗱 𝗥𝗲𝗽𝗲𝘁𝗶𝘁𝗶𝗼𝗻:
- Revisit problems after 3 days, a week, and 15 days. Break down solutions instead of rote memorization.
- 3:7:15 Rule for DSA: https://lnkd.in/dW6a8wcg

𝟱. 𝗜𝗱𝗲𝗻𝘁𝗶𝗳𝘆 𝗿𝗲𝘂𝘀𝗮𝗯𝗹𝗲 𝘁𝗲𝗰𝗵𝗻𝗶𝗾𝘂𝗲𝘀 𝗮𝗻𝗱 𝗰𝗼𝗱𝗲 𝗯𝗹𝗼𝗰𝗸𝘀:
- Isolate common patterns like Binary Search or Depth First Search for focused practice.
- 20 DSA patterns: https://lnkd.in/d9GCezMm
- 14 problem solving patterns: https://lnkd.in/daysVFSz
- DSA questions patterns: https://lnkd.in/d3rRHTfE

𝟲. 𝗘𝘅𝗽𝗮𝗻𝗱 𝗶𝗻𝘁𝗼 𝗕𝗿𝗲𝗮𝗱𝘁𝗵:
- Once you've mastered core problems and techniques, tackle a wider range of questions. Keep it realistic and relevant to interview scenarios.
- 16 Important algorithms problems: https://lnkd.in/dfjm8ked
- Tips to solve any DSA question by understanding patterns: https://lnkd.in/d9GVyfBY

Additional tips
Practice on paper: Practice whiteboard interviews to improve your planning and coding skills without relying on an IDE. It’s a practical way to get ready for real interviews.

Ref: Rajat Gajbhiye
@UndercodeCommunity
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🔍 A Greener Search: #Firefox Partners with Ecosia

https://undercodenews.com/a-greener-search-firefox-partners-with-ecosia/

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#Nvidia's RTX 5060: A Controversial 8GB VRAM Rumor

https://undercodenews.com/nvidias-rtx-5060-a-controversial-8gb-vram-rumor/

@Undercode_News

🦑🔍 Mastering DNS & DHCP Penetration Testing: Protect Your Network’s Core!

DNS (Domain Name System) and DHCP (Dynamic Host Configuration Protocol) are foundational to network operations. However, their vulnerabilities can make them prime targets for cyberattacks. Understanding how to test and secure these protocols is a critical skill for any cybersecurity professional.

Common DNS Vulnerabilities & Attacks:

1️⃣ DNS Spoofing/Poisoning: Alters DNS responses to redirect users to malicious websites.
2️⃣ DNS Tunneling: Exfiltrates data or establishes backdoors via DNS queries.
3️⃣ Cache Poisoning: Manipulates DNS cache entries to disrupt or redirect traffic.
4️⃣ Zone Transfer Exploitation: Misuses misconfigured servers to access sensitive DNS records.

Common DHCP Vulnerabilities & Attacks:

1️⃣ DHCP Starvation Attack: Exhausts IP leases, causing network disruptions.
2️⃣ Rogue DHCP Server Attack: Deploys unauthorized DHCP servers to provide malicious configurations.
3️⃣ Man-in-the-Middle (MITM) Attacks: Exploits DHCP to intercept sensitive data.
4️⃣ IP Address Spoofing: Mimics authorized devices to gain network access.

Steps to Perform DNS & DHCP Penetration Testing:

1️⃣ Reconnaissance:
• Use tools like Dig, DNSRecon, and Fierce to identify DNS configurations.
• Scan for active DHCP servers using DHCPig or Yersinia.

2️⃣ Vulnerability Analysis:
• Check for weak configurations in DNS records (e.g., open zone transfers).
• Identify rogue DHCP servers or insufficient IP allocations.

3️⃣ Exploitation:
• Simulate DNS Spoofing or Cache Poisoning to test resilience.
• Perform DHCP Starvation or Rogue Server attacks in a controlled environment.

4️⃣ Remediation:
• Harden DNS configurations (disable unused services, restrict zone transfers).
• Enable DHCP snooping and IP source guard to prevent rogue DHCP servers.

Pro Tip for Defenders:
• Implement DNSSEC (Domain Name System Security Extensions) to validate DNS responses.
• Regularly monitor and test DHCP and DNS servers for vulnerabilities.

📌 Remember: Always test ethically with proper authorization!

🔐 DNS and DHCP are the backbone of every network. Securing them not only prevents breaches but ensures smooth operations for businesses.

⚡️ #Windows 11 Gets a Much-Needed Webcam Upgrade

https://undercodenews.com/windows-11-gets-a-much-needed-webcam-upgrade/

@Undercode_News

⚡️ A Transatlantic Dream: Musk's Vision for a New York-London Tunnel

https://undercodenews.com/a-transatlantic-dream-musks-vision-for-a-new-york-london-tunnel/

@Undercode_News

🦑Cookie stealer which can then be used for session hijacking and Bypassing 2 Factor Authentication:

>> How Does it work?
Big-Papa utilizes malicious javascript code injection...and then makes a GET Request(with cookies) to the Python Web server running on the attacker machine

Note That you need to be man in the middle in order to inject the malicious javascript Code and then steal cookies of the website that the victim is currently visting

For testing purposes copy the Javascript code from the bgp.js file without the script tags and execute in the console of the browser

You can use Bettercap in-order to become man-in-the-middle using bettercap or use arp spoof and then run Big-Papa to inject Javascript

>> For HTTPS?
Big-Papa will work Perfectly against HTTP websites but For HTTPS you can use sslstrip to Downgrade it to HTTP and then utilize Big-Papa

*SSLstrip --> https://github.com/moxie0/sslstrip.git

Still some websites use HTTP and thus their data including Passwords can be read in Clear text but we need to steal cookies in some cases in order to Bypass 2-Factor-Authentication

🄸🄽🅂🅃🄰🄻🄻🄸🅂🄰🅃🄸🄾🄽 & 🅁🅄🄽 :

1️⃣ git clone https://github.com/vrikodar/Big-Papa.git

2️⃣cd Big-Papa

3️⃣chmod +x install.sh

4️⃣ ./install.sh

@UndercodeCommunity
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🚨 Why Breaches Happen: Uncovering the Hidden Vulnerabilities

https://undercodenews.com/why-breaches-happen-uncovering-the-hidden-vulnerabilities/

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🛡️ Shield Your Etsy Shop: A Guide to Outsmarting Scammers

https://undercodenews.com/shield-your-etsy-shop-a-guide-to-outsmarting-scammers/

@Undercode_News

A Glimpse into the Future: Innovation, Challenges, and #AI

https://undercodenews.com/a-glimpse-into-the-future-innovation-challenges-and-ai/

@Undercode_News

⚡️ The Wall Street Journal Launches a New Brand Campaign

https://undercodenews.com/the-wall-street-journal-launches-a-new-brand-campaign/

@Undercode_News

Climate Change and the Urgent Need for Action

https://undercodenews.com/climate-change-and-the-urgent-need-for-action/

@Undercode_News

Useful ?

🚨 A New Stealthy Threat: Borealis Stealer

https://undercodenews.com/a-new-stealthy-threat-borealis-stealer/

@Undercode_News

⚡️ #WhatsApp for #iOS 242580: A New Era for Photo and Video Albums

https://undercodenews.com/whatsapp-for-ios-242580-a-new-era-for-photo-and-video-albums/

@Undercode_News

Threads Surges: Daily Active Users Exceed 100 Million

https://undercodenews.com/threads-surges-daily-active-users-exceed-100-million/

@Undercode_News