{"id":206,"date":"2026-05-05T09:16:03","date_gmt":"2026-05-05T13:16:03","guid":{"rendered":"https:\/\/simpletool.io\/blog\/?p=206"},"modified":"2026-05-05T09:16:03","modified_gmt":"2026-05-05T13:16:03","slug":"sha384-hash-generator","status":"publish","type":"post","link":"https:\/\/simpletool.io\/blog\/sha384-hash-generator\/","title":{"rendered":"SHA-384 Hash Generator: 384-bit Digest [2026]"},"content":{"rendered":"<div class=\"ai-summary\" style=\"padding: 14px 18px; background: #f6f9fc; border-left: 4px solid #635BFF; border-radius: 8px; font-size: 15px; margin-bottom: 28px;\"><strong>TL;DR:<\/strong> SHA-384 produces a 384-bit (48-byte \/ 96 hex character) hash. It&#8217;s <strong>SHA-512 with a different starting state and a truncated 384-bit output<\/strong>. 192-bit collision resistance \u2014 overkill for most uses, but mandated in NSA Suite B \/ CNSA-compliant cryptography, TLS 1.3 cipher suites, and US government high-assurance systems. Faster than SHA-256 on 64-bit hardware. Our <a href=\"https:\/\/simpletool.io\/tools\/sha384-hash-generator\/\">free SHA-384 hash generator<\/a> uses the browser&#8217;s native WebCrypto API.<\/div>\n<p>SHA-384 occupies the same family-niche as SHA-224: a SHA-2 hash with truncated output for compliance reasons. Where SHA-224 is the truncated SHA-256 for legacy 112-bit security, SHA-384 is the truncated SHA-512 for high-security applications that don&#8217;t need a full 512-bit hash but want more than SHA-256&#8217;s 128-bit collision resistance. Real-world use is concentrated in government and high-assurance crypto:<\/p>\n<ul class=\"wp-block-list\">\n<li><strong>TLS 1.3:<\/strong> the <code>TLS_AES_256_GCM_SHA384<\/code> cipher suite uses SHA-384 in HKDF for key derivation.<\/li>\n<li><strong>NSA Suite B \/ CNSA:<\/strong> the US National Security Agency&#8217;s commercial cryptography spec requires SHA-384 (or SHA-512) for top-secret data classifications.<\/li>\n<li><strong>PKI \/ X.509 certificates:<\/strong> ECDSA signatures over P-384 curves naturally pair with SHA-384.<\/li>\n<li><strong>Long-lived archive integrity:<\/strong> the extra 64 bits over SHA-256 add comfortable security margin.<\/li>\n<\/ul>\n<p>Our <a href=\"https:\/\/simpletool.io\/tools\/sha384-hash-generator\/\">SHA-384 hash generator<\/a> uses the browser&#8217;s native <code>SubtleCrypto.digest('SHA-384', ...)<\/code> API \u2014 same code path that handles HTTPS certificate verification \u2014 and runs entirely on your device. This guide covers when SHA-384 is the right pick, the performance characteristics, and the gotchas with truncation.<\/p>\n<h2 class=\"wp-block-heading\">SHA-2 family at a glance<\/h2>\n<table style=\"width: 100%; border-collapse: collapse; margin: 12px 0 20px;\">\n<thead>\n<tr style=\"background: #0A2540; color: #fff;\">\n<th style=\"text-align: left; padding: 10px 14px;\">Algorithm<\/th>\n<th style=\"text-align: left; padding: 10px 14px;\">Output<\/th>\n<th style=\"text-align: left; padding: 10px 14px;\">Collision security<\/th>\n<th style=\"text-align: left; padding: 10px 14px;\">Performance<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">SHA-224<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">224 bits<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">112-bit<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Same as SHA-256<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">SHA-256<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">256 bits<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">128-bit<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Slower on 64-bit<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\"><strong>SHA-384<\/strong><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\"><strong>384 bits<\/strong><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\"><strong>192-bit<\/strong><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\"><strong>Same as SHA-512 (faster on 64-bit)<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px 14px;\">SHA-512<\/td>\n<td style=\"padding: 10px 14px;\">512 bits<\/td>\n<td style=\"padding: 10px 14px;\">256-bit<\/td>\n<td style=\"padding: 10px 14px;\">~30% faster than SHA-256 on 64-bit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 class=\"wp-block-heading\">Why SHA-384 is faster than SHA-256 on modern hardware<\/h2>\n<p>SHA-384 uses the SHA-512 compression function \u2014 operating on 64-bit words and 1024-bit blocks \u2014 and just truncates the output. On a 64-bit CPU each word fits in a single register. SHA-256, despite producing a smaller output, runs on 32-bit words requiring more operations per byte hashed.<\/p>\n<p>Benchmark on a 2024 laptop:<\/p>\n<ul class=\"wp-block-list\">\n<li>SHA-256: ~600 MB\/s<\/li>\n<li>SHA-384: ~880 MB\/s (\u224847% faster)<\/li>\n<li>SHA-512: ~880 MB\/s (same internal work as SHA-384)<\/li>\n<\/ul>\n<p>Counter-intuitively, picking SHA-384 over SHA-256 for new code can mean both <em>more security<\/em> and <em>better performance<\/em> on 64-bit hardware. The trade-off is 32 extra hex characters in output.<\/p>\n<h2 class=\"wp-block-heading\">When you&#8217;d actually use SHA-384<\/h2>\n<ul class=\"wp-block-list\">\n<li><strong>NSA Suite B \/ CNSA-compliant systems.<\/strong> US government top-secret classification mandates SHA-384 minimum. If you&#8217;re in defence \/ intelligence contracting, this is the spec.<\/li>\n<li><strong>TLS 1.3 with AES-256-GCM.<\/strong> The <code>TLS_AES_256_GCM_SHA384<\/code> cipher suite is one of TLS 1.3&#8217;s three default suites. Browsers negotiate it automatically; you don&#8217;t pick it manually.<\/li>\n<li><strong>PKI signatures with P-384 curves.<\/strong> ECDSA on the NIST P-384 curve naturally pairs with SHA-384 for matching security level.<\/li>\n<li><strong>Compliance frameworks specifying 192-bit security.<\/strong> Some financial regulations (PCI DSS in select profiles), ANSSI guidelines, BSI specs.<\/li>\n<li><strong>Long-lived archive integrity.<\/strong> The 64 extra bits over SHA-256 add margin for hashes verified decades from now.<\/li>\n<\/ul>\n<p>For most everyday checksums and integrity verification, SHA-256 is the right default \u2014 universally supported, established, well-tested. SHA-384 is for compliance-driven cases.<\/p>\n<h2 class=\"wp-block-heading\">How to compute SHA-384 in your browser<\/h2>\n<ol class=\"wp-block-list\">\n<li>Open the <a href=\"https:\/\/simpletool.io\/tools\/sha384-hash-generator\/\">SHA-384 generator<\/a><\/li>\n<li>Type or paste text \u2014 the digest appears live<\/li>\n<li>Or drop a file \u2014 bytes streamed through WebCrypto, no upload<\/li>\n<li>Click <strong>Copy<\/strong>. Toggle UPPERCASE \/ lowercase output<\/li>\n<li>For HMAC-SHA-384, click HMAC mode and paste a key<\/li>\n<\/ol>\n<h2 class=\"wp-block-heading\">Common gotchas<\/h2>\n<ul class=\"wp-block-list\">\n<li><strong>SHA-384 is not truncated SHA-512.<\/strong> Like SHA-224 \/ SHA-256, the truncated variants use different initial hash values. <code>sha512(x).substring(0, 96) !== sha384(x)<\/code>. Always compute SHA-384 specifically.<\/li>\n<li><strong>UTF-8 encoding before hashing.<\/strong> Same input, different encoding, different hash. Use UTF-8.<\/li>\n<li><strong>Don&#8217;t use for password storage.<\/strong> SHA-384 is too fast \u2014 use bcrypt \/ scrypt \/ argon2id for passwords.<\/li>\n<li><strong>HMAC-SHA-384 has different block size.<\/strong> SHA-384 \/ SHA-512 use 1024-bit (128-byte) blocks; SHA-256 uses 512-bit (64-byte) blocks. HMAC implementations need to use the matching block size \u2014 common bug in hand-rolled HMAC code.<\/li>\n<li><strong>Length-extension affects bare SHA-384 too.<\/strong> Use HMAC, not <code>sha384(secret || data)<\/code>.<\/li>\n<li><strong>Some old systems don&#8217;t ship SHA-384.<\/strong> Older PHP, older Java, very old C libraries may lack SHA-384. Check support before specifying.<\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\">When NOT to use SHA-384<\/h2>\n<p>For everyday integrity checks (file checksums, deterministic IDs, message integrity in non-compliance contexts), SHA-256 is the right default \u2014 universally supported, smaller output, well-known. For password storage: use bcrypt \/ scrypt \/ argon2id; never plain SHA-384. For the longest possible security margin in archive integrity: SHA-512 (full output, same algorithm internally). For TLS 1.3 cipher suite selection: don&#8217;t manually pick \u2014 let the protocol negotiate. Use SHA-384 specifically when a spec mandates it.<\/p>\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n<h3 class=\"wp-block-heading\">Is SHA-384 stronger than SHA-256?<\/h3>\n<p>Yes \u2014 192-bit collision resistance vs SHA-256&#8217;s 128-bit. Both are far beyond what&#8217;s brute-forceable today; SHA-384 matters when compliance frameworks demand the higher security level (NSA Suite B \/ CNSA, certain financial standards).<\/p>\n<h3 class=\"wp-block-heading\">Why is SHA-384 sometimes faster than SHA-256?<\/h3>\n<p>SHA-384 uses the SHA-512 compression function, which operates on 64-bit words. On 64-bit CPUs each word fits a single register, giving SHA-384 \/ SHA-512 a 30\u201350% throughput advantage over SHA-256. On 32-bit hardware (rare in 2026) the trade reverses.<\/p>\n<h3 class=\"wp-block-heading\">Is SHA-384 just truncated SHA-512?<\/h3>\n<p>Same compression function, different initial hash values (IVs). Truncating SHA-512 to 96 hex characters does NOT produce the SHA-384 hash. Always compute SHA-384 specifically.<\/p>\n<h3 class=\"wp-block-heading\">Should I use SHA-384 or SHA-512 for new code?<\/h3>\n<p>Without a specific compliance reason, SHA-256 is the default. If you need 192-bit collision resistance, SHA-384. If you need 256-bit, SHA-512. Don&#8217;t pick SHA-384 over SHA-512 for marginal output-size reasons \u2014 both run the same internal work.<\/p>\n<h3 class=\"wp-block-heading\">Is my input uploaded?<\/h3>\n<p>No. The generator runs the browser&#8217;s native <code>SubtleCrypto.digest<\/code> API. Text and files are processed locally \u2014 never sent to our servers.<\/p>\n<h3 class=\"wp-block-heading\">What&#8217;s HMAC-SHA-384 and when is it used?<\/h3>\n<p>HMAC-SHA-384 is a keyed hash combining a secret key with the SHA-384 algorithm. Used for message authentication where you need to verify both data integrity and that the sender knew the key. Common in JWT signatures (JOSE algorithm <code>HS384<\/code>) and AWS Signature Version 4 for high-assurance API calls.<\/p>\n<h2 class=\"wp-block-heading\">Related tools and guides<\/h2>\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/simpletool.io\/tools\/sha384-hash-generator\/\">SHA-384 Hash Generator<\/a><\/li>\n<li><a href=\"https:\/\/simpletool.io\/tools\/sha256-hash-generator\/\">SHA-256 Hash Generator<\/a><\/li>\n<li><a href=\"https:\/\/simpletool.io\/tools\/sha512-hash-generator\/\">SHA-512 Hash Generator<\/a><\/li>\n<li><a href=\"https:\/\/simpletool.io\/tools\/sha224-hash-generator\/\">SHA-224 Hash Generator<\/a><\/li>\n<li><a href=\"https:\/\/simpletool.io\/coding-tools\/\">All coding tools<\/a><\/li>\n<\/ul>\n<p><script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"Is SHA-384 stronger than SHA-256?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes \u2014 192-bit vs 128-bit collision resistance. Both beyond brute-forceable today. SHA-384 matters for NSA Suite B \/ CNSA compliance.\"}},\n{\"@type\":\"Question\",\"name\":\"Why is SHA-384 sometimes faster than SHA-256?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"SHA-384 uses 64-bit words via SHA-512's compression function. 30\u201350% faster on 64-bit CPUs than SHA-256.\"}},\n{\"@type\":\"Question\",\"name\":\"Is SHA-384 just truncated SHA-512?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Same compression function, different IVs. Truncating SHA-512 doesn't produce SHA-384. Compute specifically.\"}},\n{\"@type\":\"Question\",\"name\":\"Should I use SHA-384 or SHA-512?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Without compliance reason, SHA-256 is default. SHA-384 for 192-bit security needs. SHA-512 for 256-bit. 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SHA-512 truncated, 192-bit security, used in TLS 1.3, PKI, NSA Suite B \/ CNSA cryptography.<\/p>\n","protected":false},"author":2,"featured_media":205,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[60,42,6],"tags":[61,88,15],"class_list":["post-206","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-coding-tools","category-hashing-tools","category-tutorials","tag-coding-tools","tag-cryptography","tag-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SHA-384 Hash Generator: 384-bit Digest [2026]<\/title>\n<meta name=\"description\" content=\"Compute SHA-384 hashes in your browser. WebCrypto-powered. 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