Cyber Security, DevOps, DevSecOps and Technology
In recent years, the world of cryptocurrencies has expanded exponentially, offering a plethora of options for investors, traders, and enthusiasts. Among these digital assets, both major cryptocurrencies and privacy coins have garnered significant attention. Each category comes with its own set of advantages and disadvantages, catering to different needs and preferences within the crypto community.
Continue reading “Cryptocurrencies and Privacy Coins”
In the blockchain technology, Ethereum stands out as a groundbreaking platform that has transformed the landscape of decentralized applications (DApps) and smart contracts. Launched in 2015 by Vitalik Buterin, Ethereum introduced a revolutionary concept: the ability to build decentralized applications on its blockchain, using smart contracts to execute code automatically when predetermined conditions are met. Over the years, Ethereum has evolved into a powerhouse, fueling the growth of decentralized finance (DeFi), non-fungible tokens (NFTs), and a myriad of other innovative projects.
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Proton Mail, a renowned provider of secure email services, has recently released its new desktop client, setting a new standard for email security and usability. This innovative client offers a range of features that make it a top choice for individuals and businesses looking to enhance their email communication experience. I have just installed and tried it out for some days.
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This is a 50 points task in PicoCTF to solve this puzzle. I have to admit that I sat on it for a while because I suspected a complex solution like using stenography or any other hidden clues in the image file. Finally I just sat down and it became obvious immediately.
Continue reading “PicoCTF: The Numbers [CTF Write Up]”
Over the past decade, Bitcoin has emerged as a groundbreaking force, challenging traditional notions of currency and finance. Born out of the aftermath of the 2008 financial crisis, Bitcoin represents a decentralized and borderless form of digital currency that operates on a peer-to-peer network.
Continue reading “Bitcoin: A Decade of Disruption and the Promise of a Decentralized Future”
In recent years, blockchain technology has emerged as a revolutionary force with the potential to reshape industries, streamline processes, and enhance security. Originally developed as the underlying technology for cryptocurrencies like Bitcoin, blockchain has evolved far beyond its initial application. Today, it stands as a cornerstone for innovation across various sectors, offering transparency, security, and efficiency.
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The PicoCTF web exploitation tasks are fun and you can learn a lot about the web and about the tools you can use as a white hat hacker or penetration tester. Knowing about the possible security issues can help you avoid them as well as a developer. Let’s see another web security challenge!
Continue reading “PicoCTF: Cookies [CTF Write Up]”
In the realm of cryptography, the Vigenère cipher stands as a testament to the ingenuity and complexity of early encryption methods. I have to admit that it is my personal favorite of the “old” ciphers. The Vigenère cipher, often attributed to Blaise de Vigenère, was actually first described by Giovan Battista Bellaso in 1553. Bellaso’s description of a polyalphabetic substitution cipher, which later became known as the Vigenère cipher, predated de Vigenère’s work by over a century. De Vigenère’s contribution was the development of a text autokey cipher, which was misattributed to him due to his association with the Vigenère cipher. The Vigenère cipher itself was not invented by de Vigenère but rather by Bellaso and later misattributed to him.
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In the following CTF game the player looks into the HTTP communication and its request methods. It is a great opportunity to learn about what happens behind the scenes during loading a web page. The game is on PicoCTF.
Continue reading “PicoCTF: GET aHEAD [CTF Write Up]”
The use of secret codes and ciphers dates back to ancient civilizations, where rulers, generals, and diplomats employed various techniques to encode their messages. The Spartans, for example, used a device called the scytale, a rod of a particular diameter around which a strip of parchment was wound to reveal the hidden message. As societies progressed, so did the sophistication of these methods, leading to the birth of classical ciphers and, eventually, modern cryptographic techniques.
Continue reading “A Beginner’s Guide to Ciphers, Cryptography, and Encryption”
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