Jozef Krajčovič

Cryptology & history buff, interested in History of Slovakia.

[Jozef Krajčovič @kjfriedo]

Forgetted anniversary - Affair of the failed arson of Lev Printery house in Ružomberok

1/ 🧵 On 27 March 1920, a bomb was found at a printing house in Ružomberok.

It was meant to burn the building down.

[National Cryptologic Foundation @NCFcyber]

The Department of War's new post-quantum strategy requires military systems to adopt quantum-resistant encryption by 2031. Adversaries may already be collecting encrypted data to decrypt later.

Are organizations prepared for the post-quantum era?
https://t.co/c3mHBJwzVn

[Franklin Heath Ltd @franklinheath]

01 Jul 1943: Naval Enigma M4 Rotor Gamma and Thin Reflector C come into use on the German U-boat "Triton" network. #BPark

[Jozef Krajčovič @kjfriedo]

7/7
of the mid-19th century.
I wrote about the discovery, the 1853 advertisement, the booklet itself, and what it tells us about cryptography, love, privacy, and everyday secrecy.
New post on my blog https://t.co/HBst9vWJ5U

[Jozef Krajčovič @kjfriedo]

1/7
🔐 Secret writing for lovers and friends?
While researching encrypted messages in 19th-century German newspapers, I came across a small 1853 advertisement in Augsburger Tagblatt.

It advertised a booklet titled Die geheime Schrift — “The Secret Writing.”

[Jozef Krajčovič @kjfriedo]

6/7
This changes how we should search for historical cryptography.
Not every “Chiffre” in a newspaper is a cipher. Often it is just an anonymous ad reference.

But Nordeck’s booklet proves that a market for private secret writing really existed in the German-speaking world...

[Franklin Heath Ltd @franklinheath]

30 Jun 1942: US Navy Reserve Lieutenant Joe Eachus arrives at #BPark to work in Hut 8 as a Naval Enigma codebreaker. https://t.co/ERafJpGdcb

[Nicolas Krassas @Dinosn]

Offline-first, searchable arsenal for pentesting & bug bounty: payloads, a click-to-build command generator, GTFOBins, wordlists, embedded CyberChef, reverse shells, checklists & an engagement tracker. https://t.co/RduABFoIji

[National Cryptologic Foundation @NCFcyber]

On This Day in Cryptology

On June 23, 1467, Leon Battista Alberti completed his manuscript describing the polyalphabetic cipher.

By shifting ciphers within a message, Alberti created a stronger method of protecting information and laid the groundwork for modern cryptography.

[Nicolas Krassas @Dinosn]

chainreactors/aiscan: pi-like agentic security scanner — single binary for AI-driven pentesting, from red team ops to bug bounty https://t.co/dzvZkSyA7n

[Franklin Heath Ltd @franklinheath]

23 Jun 1940: #BPark Hut 6 decrypts of Red (German Air Force) Enigma key reveal some Luftwaffe units are being refitted to attack the UK.

[Franklin Heath Ltd @franklinheath]

23 Jun 1912: Birth of Alan Turing, mathematician, code breaker and father of computer science. Head of #BPark Hut 8 1940-1942.

[Tony Comer @TCHisTree]

To help those interested in Second World War UK cryptology who wonder about the difference between an indicator and a discriminant, what forty-weepy might be, or what bonking and blogging meant at that time, I have compiled from original sources a glossary. (1/3)

[Nicolas Krassas @Dinosn]

void-sniff: A lightweight x64 Native API syscall monitor with a custom inline hook engine and zero dependencies https://t.co/0dcCmCnxMh

[Nicolas Krassas @Dinosn]

Breaking Kindle DRM https://t.co/dIYwQGiZiw

[Tim O'Neill @TimONeill007]

@H_Wilson_Author "She was murdered in 415 CE by a frenzied mob for being a pagan scholar challenging Christianity."

No, she wasn't.
https://t.co/ySY6FU3sNO

[Vivek | Cybersecurity @VivekIntel]

Anthropic just open-sourced a reference framework for AI-powered vulnerability discovery and remediation 🤖💀

The workflow:

Recon → Find → Verify → Triage → Report → Patch

Features:
• Threat modeling
• Autonomous vulnerability hunting
• Crash verification
• Finding deduplication
• Exploitability analysis
• AI-generated patches with validation

Built around Claude Code and sandboxed agents using gVisor.

🔗 https://t.co/ZFOtXZPEn8

Interesting signal: AI is moving beyond code generation into autonomous security research and vulnerability management.

#CyberSecurity #AppSec #AI #LLM #VulnerabilityManagement #DevSecOps #ClaudeAI