Cryptography

Blockchain Technology Unveiled: Inner Workings of Bitcoin, Ethereum, and Beyond Introduction Blockchain technology is a novel approach to distributed databases that enables multiple untrusted parties to agree on a single source of truth without a central authority. At its core, a blockchain is a distributed ledger composed of sequential blocks of transactions, where each block is cryptographically linked to the previous one. This chain of blocks—secured by cryptographic hashes, digital signatures, and consensus algorithms—ensures that once data is recorded and confirmed by the network, it becomes extremely difficult to alter retroactively without detection. Blockchains like Bitcoin (the first decentralized cryptocurrency) and Ethereum (the first major smart contract platform) have popularized this technology, and newer implementations such as Cardano, Solana, and Polkadot introduce further innovations in performance and capabilities. ...

Symmetric vs Asymmetric Encryption: Key Differences Learn how symmetric and asymmetric encryption work, compare their strengths, and see which one fits your security needs in 2025. Encryption explained Encryption is one of the most important concepts in the world of cybersecurity. It lays the foundation for secure communication between two systems, and ensures that the content cannot be read by unwanted parties. Think of encryption as locking your diary with a key before leaving it on a park bench. Anyone can see the diary, but only those with the correct key can read what’s inside. Encryption protects messages, files, and even entire hard drives from prying eyes - whether those eyes belong to cyber-criminals, nosy co-workers, or rogue Wi-Fi hotspots. ...