{"id":1111,"date":"2025-05-12T03:13:02","date_gmt":"2025-05-12T08:13:02","guid":{"rendered":"https:\/\/stagefoursecurity.com\/blog\/?p=1111"},"modified":"2025-05-12T03:13:02","modified_gmt":"2025-05-12T08:13:02","slug":"cryptography-101","status":"publish","type":"post","link":"https:\/\/stagefoursecurity.com\/blog\/2025\/05\/12\/cryptography-101\/","title":{"rendered":"Cryptography 101"},"content":{"rendered":"<article>\n<header>\n<h1>\ud83d\udcd8 Cryptography 101: What Every Security Professional Should Know<\/h1>\n<p><em>By James K. Bishop, vCISO | Founder, <a href=\"https:\/\/stagefoursecurity.com\" target=\"_blank\" rel=\"noopener\">Stage Four Security<\/a><\/em><\/p>\n<\/header>\n<section>\n<h2>\ud83d\udd0d Why Crypto Still Matters<\/h2>\n<p><a href=\"https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Crypto-Post-1.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignright wp-image-1135\" src=\"https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Crypto-Post-1-300x200.png\" alt=\"\" width=\"400\" height=\"267\" srcset=\"https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Crypto-Post-1-300x200.png 300w, https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Crypto-Post-1-1024x683.png 1024w, https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Crypto-Post-1-768x512.png 768w, https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Crypto-Post-1.png 1536w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a>Cryptography isn\u2019t just for privacy\u2014it\u2019s the engine behind modern trust. It powers authentication, secure communication, software integrity, and identity verification. But too often, crypto is treated as a black box: \u201cjust use AES and TLS and move on.\u201d<\/p>\n<p>This post breaks down the foundational cryptographic concepts that every security professional\u2014not just cryptographers\u2014needs to understand. We\u2019ll keep the math light and focus on how encryption, hashing, and digital signatures work in the real world.<\/p>\n<\/section>\n<section>\n<h2>\ud83d\udd10 Encryption Basics: Symmetric vs. Asymmetric<\/h2>\n<h3>Symmetric Encryption (Shared Secret)<\/h3>\n<ul>\n<li>Same key for both encryption and decryption<\/li>\n<li>Fast, efficient\u2014ideal for bulk data (e.g., AES)<\/li>\n<li>Used in disk encryption, VPNs, TLS session encryption<\/li>\n<\/ul>\n<h3>Asymmetric Encryption (Public\/Private Key Pairs)<\/h3>\n<ul>\n<li>One key encrypts (public), the other decrypts (private)<\/li>\n<li>Used for secure key exchange, email encryption, digital signatures<\/li>\n<li>Slower, but enables trust between untrusted parties (e.g., RSA, ECC)<\/li>\n<\/ul>\n<p>In TLS, for example, asymmetric encryption is used during the handshake to securely exchange a symmetric key, which is then used for the session.<\/p>\n<\/section>\n<section>\n<h2>\ud83d\udd01 Hashing: One-Way Functions for Data Integrity<\/h2>\n<p>Cryptographic hash functions (like SHA-256 or BLAKE2) take an input and produce a fixed-size output. Good hash functions are:<\/p>\n<ul>\n<li><strong>Deterministic:<\/strong> Same input = same output<\/li>\n<li><strong>Irreversible:<\/strong> Can\u2019t derive the input from the hash<\/li>\n<li><strong>Collision-resistant:<\/strong> No two inputs produce the same hash<\/li>\n<\/ul>\n<p>Hashes are used for integrity checks, password storage (with salts), signing, and in blockchain structures like Merkle trees.<\/p>\n<\/section>\n<section>\n<h2>\u270d\ufe0f Digital Signatures: Proving Authenticity<\/h2>\n<p>Digital signatures combine hashing and asymmetric encryption to ensure that data is:<\/p>\n<ul>\n<li><strong>Authentic:<\/strong> Signed by the claimed sender<\/li>\n<li><strong>Untampered:<\/strong> Altered messages fail verification<\/li>\n<\/ul>\n<p>Example: In email (PGP), the sender signs a hash of the message using their private key. Recipients verify the signature using the sender\u2019s public key.<\/p>\n<p>In software security, digital signatures validate code, containers, firmware, and documents (think DocuSign or app store downloads).<\/p>\n<\/section>\n<section>\n<h2>\ud83e\udde0 Real-World Applications<\/h2>\n<ul>\n<li><strong>TLS:<\/strong> Uses asymmetric crypto to exchange keys and symmetric crypto to protect sessions<\/li>\n<li><strong>Disk encryption:<\/strong> Uses symmetric AES with OS-level key management<\/li>\n<li><strong>JWT tokens:<\/strong> Signed using HMAC (symmetric) or RSA (asymmetric) for API authentication<\/li>\n<li><strong>Blockchain:<\/strong> Uses hashes for block integrity and digital signatures for transaction trust<\/li>\n<\/ul>\n<p>Cryptography isn&#8217;t just about hiding data\u2014it&#8217;s about verifying who you&#8217;re talking to and trusting that your data wasn&#8217;t tampered with in transit or at rest.<\/p>\n<\/section>\n<section>\n<h2>\ud83d\uded1 Crypto Misuse Destroys Security<\/h2>\n<p>Most real-world crypto failures don\u2019t come from broken algorithms\u2014they come from misuse:<\/p>\n<ul>\n<li>Hardcoded keys in code or firmware<\/li>\n<li>Using ECB mode instead of CBC or GCM (for AES)<\/li>\n<li>Failing to validate certificates or expiration dates<\/li>\n<li>Misconfigured TLS (e.g., outdated ciphers, self-signed certs)<\/li>\n<\/ul>\n<p>Knowing what to look for\u2014and what to avoid\u2014is as important as knowing how crypto works.<\/p>\n<\/section>\n<section>\n<h2>\ud83d\udcda Terms You Should Know<\/h2>\n<ul>\n<li><strong>PKI:<\/strong> Public Key Infrastructure\u2014how certificates and trust chains work<\/li>\n<li><strong>HMAC:<\/strong> Hash-based Message Authentication Code\u2014used in APIs, JWTs<\/li>\n<li><strong>Salt:<\/strong> Random data added to passwords before hashing to prevent rainbow table attacks<\/li>\n<li><strong>Nonce\/IV:<\/strong> Unique random values added to encryptions to ensure uniqueness<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2>\ud83d\udce3 Final Thought<\/h2>\n<p>Cryptography isn\u2019t magic\u2014and it isn\u2019t optional. You don\u2019t need to invent your own algorithms, but you do need to understand how they\u2019re applied, validated, and sometimes dangerously misused.<\/p>\n<p><strong>Need help reviewing crypto architecture, PKI deployments, or secure key handling?<\/strong> <a href=\"https:\/\/stagefoursecurity.com\/blog\/partner-with-stage-four-security\/\" target=\"_blank\" rel=\"noopener\">Let\u2019s talk<\/a>.<\/p>\n<\/section>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udcd8 Cryptography 101: What Every Security Professional Should Know By James K. Bishop, vCISO | Founder, Stage Four Security \ud83d\udd0d [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[14],"tags":[],"class_list":["post-1111","post","type-post","status-publish","format-standard","hentry","category-cryptography"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.0 - 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