hackArcana
@hackarcana.bsky.social
Train your Hands-on Cybersecurity Skills → https://hackArcana.com
🚨 Learning C/C++?
Beware of this classic trap: unspecified argument evaluation order!
Different compilers = different results
See why a specific tiny piece of code can behave wildly differently here hackarcana.com/code-print
Beware of this classic trap: unspecified argument evaluation order!
Different compilers = different results
See why a specific tiny piece of code can behave wildly differently here hackarcana.com/code-print
April 16, 2025 at 6:01 AM
🚨 Learning C/C++?
Beware of this classic trap: unspecified argument evaluation order!
Different compilers = different results
See why a specific tiny piece of code can behave wildly differently here hackarcana.com/code-print
Beware of this classic trap: unspecified argument evaluation order!
Different compilers = different results
See why a specific tiny piece of code can behave wildly differently here hackarcana.com/code-print
🟢 It’s not too late to join us!
The Mastering Binary Files and Protocols workshop starts tomorrow (Apr 8) at 6pm CEST.
If you sign up today, you’ll still get:
✅ A spot in all of the live sessions
✅ Full access to all recordings
✅ 10% off with code MBF-HBS-10
Register here: hackarcana.com/bin
The Mastering Binary Files and Protocols workshop starts tomorrow (Apr 8) at 6pm CEST.
If you sign up today, you’ll still get:
✅ A spot in all of the live sessions
✅ Full access to all recordings
✅ 10% off with code MBF-HBS-10
Register here: hackarcana.com/bin
April 7, 2025 at 11:00 AM
🟢 It’s not too late to join us!
The Mastering Binary Files and Protocols workshop starts tomorrow (Apr 8) at 6pm CEST.
If you sign up today, you’ll still get:
✅ A spot in all of the live sessions
✅ Full access to all recordings
✅ 10% off with code MBF-HBS-10
Register here: hackarcana.com/bin
The Mastering Binary Files and Protocols workshop starts tomorrow (Apr 8) at 6pm CEST.
If you sign up today, you’ll still get:
✅ A spot in all of the live sessions
✅ Full access to all recordings
✅ 10% off with code MBF-HBS-10
Register here: hackarcana.com/bin
👇7 benefits of joining Mastering Binary Files and Protocols 👇
✔️ Real binary skills
✔️ Faster debugging
✔️ Security mindset
✔️ Independence
✔️ Career boost
✔️ Problem-solving
✔️ Data insight
🗓️ Starts April 8
🎥 Live sessions + downloadable recordings
💸 MBF-HBS-10 = 10% off until April 7
🔗 hackarcana.com/bin
✔️ Real binary skills
✔️ Faster debugging
✔️ Security mindset
✔️ Independence
✔️ Career boost
✔️ Problem-solving
✔️ Data insight
🗓️ Starts April 8
🎥 Live sessions + downloadable recordings
💸 MBF-HBS-10 = 10% off until April 7
🔗 hackarcana.com/bin
April 4, 2025 at 8:09 PM
👇7 benefits of joining Mastering Binary Files and Protocols 👇
✔️ Real binary skills
✔️ Faster debugging
✔️ Security mindset
✔️ Independence
✔️ Career boost
✔️ Problem-solving
✔️ Data insight
🗓️ Starts April 8
🎥 Live sessions + downloadable recordings
💸 MBF-HBS-10 = 10% off until April 7
🔗 hackarcana.com/bin
✔️ Real binary skills
✔️ Faster debugging
✔️ Security mindset
✔️ Independence
✔️ Career boost
✔️ Problem-solving
✔️ Data insight
🗓️ Starts April 8
🎥 Live sessions + downloadable recordings
💸 MBF-HBS-10 = 10% off until April 7
🔗 hackarcana.com/bin
Come tonight at 7PM CEST!
If you're into:
🧠 reverse engineering
🛠 understanding how things work
🧩 solving CTF-style puzzles
— you'll love this session with @gynvael.bsky.social !
🔴 www.youtube.com/live/xVrxfEk...
If you're into:
🧠 reverse engineering
🛠 understanding how things work
🧩 solving CTF-style puzzles
— you'll love this session with @gynvael.bsky.social !
🔴 www.youtube.com/live/xVrxfEk...
🎮 Live CTF: Solving "Gamepad" from Gynvael’s Collection | hackArcana Challenge
YouTube video by GynvaelEN
www.youtube.com
April 2, 2025 at 9:41 AM
Come tonight at 7PM CEST!
If you're into:
🧠 reverse engineering
🛠 understanding how things work
🧩 solving CTF-style puzzles
— you'll love this session with @gynvael.bsky.social !
🔴 www.youtube.com/live/xVrxfEk...
If you're into:
🧠 reverse engineering
🛠 understanding how things work
🧩 solving CTF-style puzzles
— you'll love this session with @gynvael.bsky.social !
🔴 www.youtube.com/live/xVrxfEk...
🚨 Last hours to join our free webinar with a legend – Gynvael Coldwind!
What’s inside?
• Real file handling mistakes
• Weird path behavior
• Hacker’s perspective on files
• Even a bit of forensics 👀
🧩 Perfect for devs, admins, hackers & the curious.
⏳ Time’s running out → hexarcana.ch/lp/files
What’s inside?
• Real file handling mistakes
• Weird path behavior
• Hacker’s perspective on files
• Even a bit of forensics 👀
🧩 Perfect for devs, admins, hackers & the curious.
⏳ Time’s running out → hexarcana.ch/lp/files
March 31, 2025 at 7:31 AM
🚨 Last hours to join our free webinar with a legend – Gynvael Coldwind!
What’s inside?
• Real file handling mistakes
• Weird path behavior
• Hacker’s perspective on files
• Even a bit of forensics 👀
🧩 Perfect for devs, admins, hackers & the curious.
⏳ Time’s running out → hexarcana.ch/lp/files
What’s inside?
• Real file handling mistakes
• Weird path behavior
• Hacker’s perspective on files
• Even a bit of forensics 👀
🧩 Perfect for devs, admins, hackers & the curious.
⏳ Time’s running out → hexarcana.ch/lp/files
What will you learn in this webinar?
🧩 What is a file—really?
🧠 Hidden file features & common dev mistakes
📁 Weird world of file paths (yes, it gets strange)
🔍 A glimpse into digital forensics
🗓 March 31 | ⏰ 8 PM CEST | 💸 Free
Save your spot 👉 hexarcana.ch/lp/files/
and see you on Monday!
🧩 What is a file—really?
🧠 Hidden file features & common dev mistakes
📁 Weird world of file paths (yes, it gets strange)
🔍 A glimpse into digital forensics
🗓 March 31 | ⏰ 8 PM CEST | 💸 Free
Save your spot 👉 hexarcana.ch/lp/files/
and see you on Monday!
March 27, 2025 at 7:15 PM
What will you learn in this webinar?
🧩 What is a file—really?
🧠 Hidden file features & common dev mistakes
📁 Weird world of file paths (yes, it gets strange)
🔍 A glimpse into digital forensics
🗓 March 31 | ⏰ 8 PM CEST | 💸 Free
Save your spot 👉 hexarcana.ch/lp/files/
and see you on Monday!
🧩 What is a file—really?
🧠 Hidden file features & common dev mistakes
📁 Weird world of file paths (yes, it gets strange)
🔍 A glimpse into digital forensics
🗓 March 31 | ⏰ 8 PM CEST | 💸 Free
Save your spot 👉 hexarcana.ch/lp/files/
and see you on Monday!
🚨
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Reposted by hackArcana
If you like CTF challenges, we've been steadily pushing some of my favorite tasks to my new edu site:
hackarcana.com/exercises
From top to bottom: Linux RE, 2x JS RE, USB PCAP, ZIP/crypto, DOS/VGA RE, 2x BMP image stegano, 5x BMP file format stegano, Python 2.7 RE, and ROP RE
HFGL
hackarcana.com/exercises
From top to bottom: Linux RE, 2x JS RE, USB PCAP, ZIP/crypto, DOS/VGA RE, 2x BMP image stegano, 5x BMP file format stegano, Python 2.7 RE, and ROP RE
HFGL
March 14, 2025 at 8:37 AM
If you like CTF challenges, we've been steadily pushing some of my favorite tasks to my new edu site:
hackarcana.com/exercises
From top to bottom: Linux RE, 2x JS RE, USB PCAP, ZIP/crypto, DOS/VGA RE, 2x BMP image stegano, 5x BMP file format stegano, Python 2.7 RE, and ROP RE
HFGL
hackarcana.com/exercises
From top to bottom: Linux RE, 2x JS RE, USB PCAP, ZIP/crypto, DOS/VGA RE, 2x BMP image stegano, 5x BMP file format stegano, Python 2.7 RE, and ROP RE
HFGL
Did you know pressing CTRL+D can make some C++ programs crash or loop forever? 🤯
That’s because cin enters an error state instead of truly “closing” input. Most apps handle it well—but not all 🙅
Want to see why?
Read our recent article 👉 hackarcana.com/article/ctrl...
That’s because cin enters an error state instead of truly “closing” input. Most apps handle it well—but not all 🙅
Want to see why?
Read our recent article 👉 hackarcana.com/article/ctrl...
March 13, 2025 at 1:18 PM
Did you know pressing CTRL+D can make some C++ programs crash or loop forever? 🤯
That’s because cin enters an error state instead of truly “closing” input. Most apps handle it well—but not all 🙅
Want to see why?
Read our recent article 👉 hackarcana.com/article/ctrl...
That’s because cin enters an error state instead of truly “closing” input. Most apps handle it well—but not all 🙅
Want to see why?
Read our recent article 👉 hackarcana.com/article/ctrl...
We've published a new article!
⌨️ Linux Terminal: CTRL+D is like pressing ENTER
hackarcana.com/article/ctrl...
Enjoy!
⌨️ Linux Terminal: CTRL+D is like pressing ENTER
hackarcana.com/article/ctrl...
Enjoy!
hackarcana.com
March 11, 2025 at 11:49 AM
We've published a new article!
⌨️ Linux Terminal: CTRL+D is like pressing ENTER
hackarcana.com/article/ctrl...
Enjoy!
⌨️ Linux Terminal: CTRL+D is like pressing ENTER
hackarcana.com/article/ctrl...
Enjoy!
Pro tip for protocol hand-crafting lovers:
Having problems sending \r\n on Linux? Press CTRL+V to escape the next key press, and follow it up with ENTER to get \r.
CTRL+V, ENTER, ENTER → \r\n
Having problems sending \r\n on Linux? Press CTRL+V to escape the next key press, and follow it up with ENTER to get \r.
CTRL+V, ENTER, ENTER → \r\n
March 8, 2025 at 8:48 AM
Pro tip for protocol hand-crafting lovers:
Having problems sending \r\n on Linux? Press CTRL+V to escape the next key press, and follow it up with ENTER to get \r.
CTRL+V, ENTER, ENTER → \r\n
Having problems sending \r\n on Linux? Press CTRL+V to escape the next key press, and follow it up with ENTER to get \r.
CTRL+V, ENTER, ENTER → \r\n
⚠️ Sanitizing input is tricky! Removing unwanted HTML tags prevents XSS, but won’t stop SQL injections. To keep your app safe, use validation, escaping, and sanitization where they belong 🔐
🔗 Read more here: hackarcana.com/article/sani...
🔗 Read more here: hackarcana.com/article/sani...
March 7, 2025 at 9:58 AM
⚠️ Sanitizing input is tricky! Removing unwanted HTML tags prevents XSS, but won’t stop SQL injections. To keep your app safe, use validation, escaping, and sanitization where they belong 🔐
🔗 Read more here: hackarcana.com/article/sani...
🔗 Read more here: hackarcana.com/article/sani...
We've got 200% increase in players overnight!
Well, yes, it's 2→4 on the scoreboard, but we're just starting :)
And we have more challenges on the way, a lot more!
Well, yes, it's 2→4 on the scoreboard, but we're just starting :)
And we have more challenges on the way, a lot more!
March 7, 2025 at 9:36 AM
We've got 200% increase in players overnight!
Well, yes, it's 2→4 on the scoreboard, but we're just starting :)
And we have more challenges on the way, a lot more!
Well, yes, it's 2→4 on the scoreboard, but we're just starting :)
And we have more challenges on the way, a lot more!
For your enjoyment we're slowly adding @gynvael.bsky.social old challenges to our archive: hackarcana.com/exercises
Slowly... becuase we test each one and re-flag them.
Some fun ones are yet to come!
Enjoy!
P.S. If you like scoreboards, here's a chance to grab top1 easily.
Slowly... becuase we test each one and re-flag them.
Some fun ones are yet to come!
Enjoy!
P.S. If you like scoreboards, here's a chance to grab top1 easily.
hackarcana.com
March 5, 2025 at 8:09 PM
For your enjoyment we're slowly adding @gynvael.bsky.social old challenges to our archive: hackarcana.com/exercises
Slowly... becuase we test each one and re-flag them.
Some fun ones are yet to come!
Enjoy!
P.S. If you like scoreboards, here's a chance to grab top1 easily.
Slowly... becuase we test each one and re-flag them.
Some fun ones are yet to come!
Enjoy!
P.S. If you like scoreboards, here's a chance to grab top1 easily.
🚀 New blog post on hackArcana!
Learn about:
🔹 Validation vs. escaping vs. filtering
🔹 When to use each method
🔹 Common input handling mistakes
🔗 Read here: hackarcana.com/article/sani...
Learn about:
🔹 Validation vs. escaping vs. filtering
🔹 When to use each method
🔹 Common input handling mistakes
🔗 Read here: hackarcana.com/article/sani...
hackarcana.com
March 4, 2025 at 4:15 PM
🚀 New blog post on hackArcana!
Learn about:
🔹 Validation vs. escaping vs. filtering
🔹 When to use each method
🔹 Common input handling mistakes
🔗 Read here: hackarcana.com/article/sani...
Learn about:
🔹 Validation vs. escaping vs. filtering
🔹 When to use each method
🔹 Common input handling mistakes
🔗 Read here: hackarcana.com/article/sani...
Hey everyone! 👋
This is the official account of hackarcana.com — the educational portal from HexArcana Cybersecurity (hexarcana.ch).
If you want to up your skills in hands-on cybersec, click follow!
This is the official account of hackarcana.com — the educational portal from HexArcana Cybersecurity (hexarcana.ch).
If you want to up your skills in hands-on cybersec, click follow!
March 4, 2025 at 4:14 PM
Hey everyone! 👋
This is the official account of hackarcana.com — the educational portal from HexArcana Cybersecurity (hexarcana.ch).
If you want to up your skills in hands-on cybersec, click follow!
This is the official account of hackarcana.com — the educational portal from HexArcana Cybersecurity (hexarcana.ch).
If you want to up your skills in hands-on cybersec, click follow!
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