Articles
In-depth, no-nonsense explainers on cybersecurity, cryptography, quantum computing and the technology that underpins them. 115 articles and growing — free, evergreen, and written for people who want to understand how things actually work.
⚿ Cryptography 12
Ciphers, hashes, signatures and the math that secures data.
- AES Encryption Explained: How the Advanced Encryption Standard WorksAES encryption is the Advanced Encryption Standard used to secure data worldwide. Learn how AES works including rounds S-boxes key sizes and modes.
- Block Cipher Modes of Operation: ECB, CBC, CTR, and GCMBlock cipher modes turn a block cipher like AES into a full encryption scheme. Learn how ECB CBC CTR and GCM work and which modes are safe to use.
- ChaCha20-Poly1305: Modern Authenticated EncryptionChaCha20-Poly1305 is a fast authenticated encryption construction used in TLS. Learn how the ChaCha20 stream cipher and Poly1305 authenticator work together.
- Diffie-Hellman Key Exchange ExplainedDiffie-Hellman key exchange lets two parties agree on a shared secret over an insecure channel. Learn how the protocol works and why authentication matters.
- Digital Signatures Explained: RSA, ECDSA, and EdDSADigital signatures prove authenticity integrity and non-repudiation with public-key cryptography. Learn how RSA ECDSA and EdDSA signature schemes work.
- Elliptic Curve Cryptography (ECC) ExplainedElliptic curve cryptography delivers strong public-key security with small keys. Learn how ECC works including point addition scalar multiplication and curves.
- HMAC Explained: Hash-Based Message Authentication CodesHMAC is a hash-based message authentication code that provides integrity and authenticity. Learn how HMAC works its construction and why it resists attacks.
- Password Hashing Explained: bcrypt, scrypt, Argon2, and PBKDF2Password hashing protects stored credentials using slow salted algorithms. Learn how bcrypt scrypt Argon2 and PBKDF2 work and how to choose parameters.
- Public Key Infrastructure (PKI) and X.509 Certificates ExplainedPublic key infrastructure binds identities to public keys using X.509 certificates and certificate authorities. Learn how PKI trust chains and revocation work.
- RSA Encryption Explained: How Public-Key Cryptography WorksRSA encryption is a public-key cryptosystem built on the hardness of factoring. Learn how RSA works including key generation encryption and secure padding.
- SHA-256 and the SHA-2 Family of Hash FunctionsSHA-256 is the most widely used SHA-2 hash function. Learn how SHA-256 works its Merkle-Damgard structure security properties and where hashing is applied.
- Zero-Knowledge Proofs ExplainedZero-knowledge proofs let one party prove a statement is true without revealing why. Learn how ZKPs work their properties and zk-SNARKs and zk-STARKs.
⚛ Quantum & Post-Quantum 11
Quantum computing and the cryptography built to survive it.
- Crypto-Agility: Migrating to Post-Quantum CryptographyCrypto-agility explained, a framework for migrating to post-quantum cryptography using cryptographic inventory, hybrid schemes, and quantum-safe rollout.
- Grover's Algorithm and Its Impact on Symmetric CryptographyGrover's algorithm explained and how its quadratic speedup for unstructured search affects AES symmetric encryption and hash functions and how to defend.
- Harvest Now, Decrypt Later: The Quantum Harvesting ThreatHarvest now decrypt later explained, the quantum harvesting threat where attackers store encrypted data to decrypt once quantum computers mature enough.
- Hash-Based Signatures: SPHINCS+, XMSS, and LamportHash-based signatures explained from Lamport one-time keys and Merkle trees to XMSS and stateless SPHINCS+ SLH-DSA for quantum-resistant digital signing.
- Lattice-Based Cryptography and Learning With ErrorsLattice-based cryptography explained through the Learning With Errors problem, lattice hard problems, and how they power quantum-resistant encryption schemes.
- ML-DSA (Dilithium): Post-Quantum Digital Signatures ExplainedML-DSA formerly Dilithium explained, the NIST post-quantum digital signature scheme built on Module-LWE and Fiat-Shamir with aborts for quantum-safe signing.
- ML-KEM (Kyber): Post-Quantum Key Encapsulation ExplainedML-KEM formerly Kyber explained, the NIST post-quantum key encapsulation mechanism built on Module-LWE lattices for quantum-safe key exchange and encryption.
- Post-Quantum Cryptography: Preparing for the Quantum EraPost-quantum cryptography explained, covering lattice, hash-based, and code-based algorithms plus NIST standards like ML-KEM and ML-DSA for the quantum era.
- Quantum Computing Explained: Qubits, Superposition, and EntanglementQuantum computing explained for security readers, covering qubits, superposition, entanglement, and quantum gates and why they threaten modern cryptography.
- Quantum Key Distribution and the BB84 ProtocolQuantum key distribution and the BB84 protocol explained, using photon polarization and the no-cloning theorem to detect eavesdropping and share secret keys.
- Shor's Algorithm and the Quantum Threat to RSA and ECCShor's algorithm explained and how a quantum computer could break RSA and ECC by solving integer factoring and discrete logarithms in polynomial time.
◇ Web Security 11
The OWASP classics and the defenses that stop them.
- Content Security Policy (CSP): A Practical GuideContent Security Policy is a browser control that limits which resources load, reducing XSS impact. Learn how to write and deploy an effective CSP header.
- CORS Explained: Cross-Origin Resource Sharing and SecurityCORS or cross-origin resource sharing relaxes the same-origin policy in a controlled way. Learn how CORS works and how to avoid dangerous misconfigurations.
- Cross-Site Scripting (XSS): Types, Attacks, and DefensesCross-site scripting or XSS lets attackers run scripts in a victim browser. Learn the reflected, stored, and DOM-based types and how to defend against them.
- Cross-Site Request Forgery (CSRF) ExplainedCross-site request forgery tricks a browser into sending authenticated requests a user never intended. Learn how CSRF works and how tokens stop it.
- JSON Web Tokens (JWT): Security Best PracticesJSON Web Tokens carry signed claims between services. Learn JWT structure, common security pitfalls, and best practices for validating tokens safely.
- OAuth 2.0 and OpenID Connect ExplainedOAuth 2.0 handles delegated authorization while OpenID Connect adds authentication. Learn the roles, grant types, tokens, and PKCE that make the flow secure.
- The OWASP Top 10 ExplainedThe OWASP Top 10 ranks the most critical web application security risks along with practical defenses that development and security teams can prioritize.
- Secure Cookies: HttpOnly, Secure, and SameSite ExplainedSecure cookies rely on the HttpOnly, Secure, and SameSite attributes to protect sessions. Learn what each attribute does and how to configure cookies safely.
- SQL Injection Explained and How to Prevent ItSQL injection lets attackers manipulate database queries through unsanitized input. Learn how the attack works and how parameterized queries prevent it.
- Server-Side Request Forgery (SSRF) ExplainedServer-side request forgery makes a server send attacker-controlled requests to internal systems. Learn how SSRF works and how to prevent it effectively.
- WebAuthn and Passkeys: Passwordless Authentication ExplainedWebAuthn and passkeys enable phishing-resistant passwordless login using public-key cryptography. Learn how registration and authentication work.
⇄ Network Security 10
Protocols, perimeters and traffic you can trust.
- ARP Spoofing and Poisoning ExplainedHow ARP spoofing and poisoning work, why the Address Resolution Protocol trusts forged replies, and the detection and defenses that protect local networks.
- DDoS Attacks: Types, Techniques, and MitigationsHow DDoS attacks work, from volumetric floods and protocol attacks to application-layer assaults, plus the mitigations that keep services online under load.
- DNS Security: DNSSEC, DoH, and DoT ExplainedDNS security explained, covering how DNSSEC authenticates records and how DoH and DoT encrypt lookups to stop spoofing, tampering, and eavesdropping.
- Firewalls Explained: From Packet Filtering to Next-GenerationHow firewalls work, from stateless packet filtering and stateful inspection to next-generation firewalls with deep packet and application inspection.
- How TLS Works: Encryption in Transit ExplainedHow TLS works to secure data in transit, from the handshake and certificates to symmetric session keys that protect web traffic from eavesdroppers.
- Intrusion Detection and Prevention Systems (IDS/IPS) ExplainedHow intrusion detection and prevention systems work, comparing signature and anomaly detection and how IDS and IPS spot and block network threats.
- Man-in-the-Middle (MITM) Attacks ExplainedHow man-in-the-middle attacks work, from ARP spoofing and DNS hijacking to TLS interception, and the encryption and authentication defenses that stop them.
- Network Segmentation and Microsegmentation ExplainedHow network segmentation and microsegmentation work, using VLANs, subnets, and identity-based policy to contain breaches and limit lateral movement.
- VPNs Explained: How Virtual Private Networks WorkHow VPNs work, from tunneling and encapsulation to IPsec and WireGuard encryption that protect traffic across untrusted networks and shield your IP address.
- Zero Trust Architecture ExplainedHow zero trust architecture works, replacing implicit network trust with continuous verification, least privilege, and identity-based access to resources.
⚷ Authentication & Identity 10
Proving who you are — from passwords to passkeys.
- Certificate-Based Authentication ExplainedCertificate-based authentication uses X.509 client certificates and public-key cryptography to prove identity through mutual TLS without shared passwords.
- Credential Stuffing and Password Spraying ExplainedCredential stuffing and password spraying are automated attacks that abuse reused and weak passwords to take over accounts, and here is how to stop them.
- FIDO2 and WebAuthn: The Future of AuthenticationFIDO2 and WebAuthn deliver phishing-resistant passwordless login using public-key cryptography, security keys, passkeys, and origin-bound credentials.
- Kerberos Authentication ExplainedKerberos authentication uses tickets and a trusted key distribution center to prove identity across a network without sending passwords over the wire.
- Multi-Factor Authentication (MFA) ExplainedMulti-factor authentication strengthens login security by combining knowledge, possession, and inherence factors to stop account takeover and phishing.
- Password Security: Best Practices and Common MistakesPassword security best practices for hashing, storage, length, and policy, plus the common mistakes that let attackers crack credentials and hijack accounts.
- SAML vs OAuth vs OpenID ConnectCompare SAML, OAuth 2.0, and OpenID Connect to understand how each handles authentication, authorization, tokens, and federated single sign-on securely.
- Session Management Security Best PracticesSession management security best practices for session IDs, secure cookies, expiration, and fixation defense to keep authenticated sessions from being hijacked.
- Single Sign-On (SSO) ExplainedSingle sign-on lets users authenticate once with an identity provider and access many applications through federated trust, tokens, and centralized login.
- TOTP and HOTP: How Authenticator Apps WorkLearn how TOTP and HOTP one-time password algorithms work, from the shared secret and HMAC to the six-digit codes that power authenticator apps.
☣ Malware & Threats 10
How attacks work and how defenders detect them.
- Advanced Persistent Threats (APTs) ExplainedAn advanced persistent threat is a stealthy long-term intrusion by a skilled adversary. Learn how APTs work and how to detect and defend against them.
- Botnets and Command-and-Control (C2) ExplainedA botnet is a network of compromised devices run through command-and-control infrastructure. Learn how botnets and C2 work and how to detect and disrupt them.
- Fileless Malware and Living-off-the-Land TechniquesFileless malware runs in memory and abuses built-in tools to evade detection. Learn how fileless and living-off-the-land attacks work and how to defend.
- The MITRE ATT&CK Framework ExplainedThe MITRE ATT&CK framework is a knowledge base of adversary tactics and techniques. Learn how ATT&CK works and how defenders use it to improve detection.
- Phishing Attacks: Techniques and DefensesPhishing attacks trick people into revealing credentials or running malware. Learn how phishing works and how to detect, prevent, and defend against it.
- Ransomware Explained: How It Works and How to DefendRansomware is malware that encrypts files and demands payment. Learn how ransomware works, how it spreads, and how to detect and defend against attacks.
- Rootkits Explained: How They Hide and How to Find ThemA rootkit is stealth malware that hides its presence deep in a system. Learn how rootkits work at different levels and how to detect and remove them.
- Social Engineering: The Human Side of HackingSocial engineering manipulates people into breaking security. Learn how social engineering attacks work and how to recognize, prevent, and defend against them.
- Supply Chain Attacks ExplainedA supply chain attack compromises a trusted vendor to reach its customers. Learn how supply chain attacks work and how to detect and defend against them.
- Types of Malware: Viruses, Worms, Trojans, and MoreA clear guide to the main types of malware including viruses, worms, trojans, ransomware, spyware, and rootkits, with detection and defense tips for each.
⚔ Offensive Security 10
Ethical hacking, pentesting and red-team methodology.
- Buffer Overflow Attacks ExplainedA buffer overflow is a memory-corruption bug where data exceeds a buffer and overwrites adjacent memory. Learn how buffer overflow attacks and defenses work.
- Bug Bounty Programs: A Getting-Started GuideBug bounty programs reward researchers for responsibly reporting vulnerabilities. Learn how bug bounties work how to start and how to write strong reports.
- Capture the Flag (CTF): Learning Security by HackingCapture the flag or CTF competitions teach security skills by solving hands-on hacking challenges. Learn the CTF formats categories and how to start competing.
- The Cyber Kill Chain ExplainedThe cyber kill chain is a model describing the stages of a cyberattack from reconnaissance to actions on objectives. Learn each phase and its defenses.
- OSINT: Open-Source Intelligence Gathering ExplainedOSINT or open-source intelligence is gathering data from publicly available sources for security research. Learn the techniques tools and ethics of OSINT.
- Password Cracking: Techniques and DefensesPassword cracking recovers passwords from stored hashes to test credential strength. Learn the techniques tools and defenses used in authorized testing.
- Penetration Testing Explained: Methodology and PhasesPenetration testing is authorized simulated hacking that finds real vulnerabilities before attackers do. Learn the phases methodology and ethics involved.
- Privilege Escalation ExplainedPrivilege escalation is how attackers gain higher access rights on a system after an initial foothold. Learn vertical and horizontal techniques and defenses.
- Red Team vs Blue Team vs Purple TeamRed team blue team and purple team describe offensive defensive and collaborative security roles. Learn how each team works and strengthens defenses together.
- Reverse Engineering Basics for SecurityReverse engineering is analyzing compiled software to understand how it works without source code. Learn the tools concepts and workflow for security research.
⚙ Application Security 10
Building software that resists attack by design.
- API Security Best PracticesAPI security best practices protect REST and web APIs from attacks. Learn authentication authorization rate limiting input validation and the OWASP API risks.
- ASLR, DEP, and Modern Exploit MitigationsASLR and DEP are exploit mitigations that make memory corruption bugs harder to weaponize. Learn how ASLR DEP stack canaries and CFI defend against attacks.
- Code Signing ExplainedCode signing uses digital signatures to prove software authenticity and integrity. Learn how signing certificates hashing timestamping and verification work.
- Dependency Confusion and Package SecurityDependency confusion tricks package managers into installing malicious public packages instead of private ones. Learn how the attack works and how to stop it.
- Fuzzing Explained: Finding Bugs AutomaticallyFuzzing automatically feeds random and malformed inputs to software to find crashes and security bugs. Learn how coverage-guided fuzzing and sanitizers work.
- Memory Safety and Why It MattersMemory safety prevents bugs like buffer overflows and use-after-free that cause most severe security vulnerabilities. Learn how it works and how to achieve it.
- Reproducible Builds ExplainedReproducible builds let anyone rebuild source code into a bit-for-bit identical binary to verify no tampering. Learn how determinism and verification work.
- SAST vs DAST vs IAST: Application Security TestingCompare SAST vs DAST vs IAST application security testing methods. Learn how static dynamic and interactive analysis find vulnerabilities and when to use each.
- The Secure Software Development Lifecycle (SSDLC)The secure software development lifecycle (SSDLC) builds security into every phase of development. Learn threat modeling secure coding testing and deployment.
- Software Supply Chain Security and SBOMsSoftware supply chain security protects the code dependencies and build systems behind your apps. Learn about SBOMs provenance and attacks like typosquatting.
⛓ Blockchain & Applied Crypto 10
The cryptography and security behind distributed ledgers.
- The 51% Attack ExplainedA 51% attack lets an entity with majority mining power reorganize blocks and double spend. Learn how the attack works and how networks defend against it.
- Public and Private Keys in Crypto Wallets ExplainedPublic and private keys in crypto wallets control your funds. Learn how key pairs are generated derive addresses sign transactions and stay secure.
- Cryptographic Hash Functions in BlockchainCryptographic hash functions are the backbone of blockchain security. Learn how SHA-256 Keccak and hashing properties protect blocks proofs and addresses.
- How Bitcoin Uses CryptographyDiscover how Bitcoin uses cryptography including SHA-256 hashing ECDSA signatures on secp256k1 addresses and proof of work to secure the network.
- How Blockchain Works: A Technical ExplanationLearn how blockchain works at a technical level from hash-linked blocks to consensus and see how cryptography makes a distributed ledger tamper evident.
- Merkle Trees ExplainedMerkle trees let blockchains commit to many transactions in one hash and prove inclusion efficiently. Learn how Merkle trees and Merkle proofs work.
- Proof of Work vs Proof of StakeCompare proof of work vs proof of stake and learn how each consensus mechanism achieves Sybil resistance security and finality in a blockchain network.
- secp256k1: The Elliptic Curve Behind Bitcoinsecp256k1 is the elliptic curve behind Bitcoin and Ethereum keys and signatures. Learn its parameters point math and why the ECDLP keeps it secure.
- Smart Contract Security ExplainedSmart contract security protects on-chain code from costly exploits. Learn common vulnerabilities like reentrancy and the patterns that defend against them.
- Zero-Knowledge Rollups and zk-SNARKs ExplainedZero-knowledge rollups scale blockchains using zk-SNARK validity proofs. Learn how zk-rollups and zk-SNARKs work and the security tradeoffs involved.
⦿ Privacy & Anonymity 9
Encryption, anonymity networks and metadata defense.
- Data Anonymization vs PseudonymizationData anonymization irreversibly removes identity while pseudonymization only masks it. Learn how they differ and when re-identification of records is possible.
- Differential Privacy ExplainedDifferential privacy adds calibrated mathematical noise so aggregate data can be analyzed without exposing whether any single individual is in the dataset.
- Encryption at Rest vs Encryption in TransitEncryption at rest protects stored data while encryption in transit protects data on the network. Learn how the two differ and why a secure system needs both.
- End-to-End Encryption ExplainedEnd-to-end encryption ensures only the sender and recipient can read messages while servers and attackers in between see only unreadable ciphertext.
- How Tor Works: Onion Routing ExplainedTor works by wrapping traffic in layers of encryption and routing it through volunteer relays so no single relay learns both who you are and where you go.
- Metadata: The Privacy Risk You OverlookMetadata reveals who you talk to when and where even when content is encrypted. Learn why this overlooked privacy risk matters and how to reduce your exposure.
- Perfect Forward Secrecy ExplainedPerfect forward secrecy uses ephemeral keys so stealing a long-term private key cannot decrypt past sessions. Learn how forward secrecy protects your data.
- Secure Messaging: What Makes an App PrivateSecure messaging depends on end-to-end encryption forward secrecy key verification and metadata protection. Learn what makes a messaging app truly private.
- The Signal Protocol and Double Ratchet ExplainedThe Signal Protocol pairs X3DH key agreement with the Double Ratchet to give secure messaging forward secrecy and post-compromise security per message.
☁ Cloud, Hardware & Emerging 12
Securing cloud, hardware roots of trust and new tech.
- AI and Machine Learning Security: Adversarial AttacksAI and machine learning security examines adversarial attacks including evasion poisoning and model extraction that manipulate models through crafted inputs.
- Cloud Security and the Shared Responsibility ModelThe shared responsibility model splits cloud security duties between provider and customer across IaaS PaaS and SaaS. Learn where the line falls and why.
- Container Security and Docker HardeningContainer security and Docker hardening reduce attack surface with minimal images non-root users and namespace isolation. Learn how containers are secured.
- Digital Forensics and Incident Response (DFIR)Digital forensics and incident response DFIR combines evidence preservation and threat containment through a structured lifecycle to investigate incidents.
- Hardware Security Modules (HSMs) ExplainedHardware security modules protect cryptographic keys in tamper-resistant hardware performing signing and encryption so keys never leave the secure boundary.
- IoT Security: Challenges and Best PracticesIoT security addresses weak default credentials unpatched firmware and insecure network exposure across billions of connected devices with layered defenses.
- Kubernetes Security Best PracticesKubernetes security best practices span RBAC network policies pod security admission and secrets to protect clusters from compromise and lateral movement.
- Prompt Injection and LLM Security ExplainedPrompt injection is the top LLM security risk where untrusted text hijacks a model instructions enabling data exfiltration and tool misuse in AI applications.
- Secrets Management ExplainedSecrets management explained covering how to store rotate and audit API keys passwords and certificates with vaults dynamic secrets and least privilege.
- Side-Channel Attacks: Timing, Power, Spectre and MeltdownSide-channel attacks leak secrets through timing power consumption and CPU speculation. Learn how timing power analysis Spectre and Meltdown work and defenses.
- TPMs and Secure Boot ExplainedTPMs and Secure Boot explained showing how measured boot platform configuration registers and signature checks establish a hardware root of trust for a device.
- Trusted Execution Environments and Secure EnclavesTrusted execution environments and secure enclaves isolate code and data in encrypted memory so even a compromised operating system cannot read their contents.