--- title: Zero Knowledge (About) Encryption: A Comparative... description: A cryptographic security research paper analyzing three major cloud-based password managers — Bitwarden, LastPass, and Dashlane — that collectively serve 60+... canonical: https://daily.dev/posts/zero-knowledge-about-encryption-a-comparative-security-analysis-of-three-cloud-based-password-man-45rslxkyl twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Zero Knowledge (About) Encryption: A Comparative Security Analysis of Three Cloud-based Password Managers | daily.dev og:description: A cryptographic security research paper analyzing three major cloud-based password managers — Bitwarden, LastPass, and Dashlane — that collectively serve 60+... og:url: https://daily.dev/posts/zero-knowledge-about-encryption-a-comparative-security-analysis-of-three-cloud-based-password-man-45rslxkyl og:image: https://api.daily.dev/og/posts/45rslxkyL.png og:image:alt: Zero Knowledge (About) Encryption: A Comparative Security Analysis of Three Cloud-based Password Managers og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Zero Knowledge (About) Encryption: A Comparative Security Analysis of Three Cloud-based Password Managers **[Tech Lead Digest](https://daily.dev/sources/techleaddigest)** · 3 min read · 2 upvotes · 0 comments ## Summary A cryptographic security research paper analyzing three major cloud-based password managers — Bitwarden, LastPass, and Dashlane — that collectively serve 60+ million users. The researchers examine whether these vendors' 'Zero Knowledge Encryption' claims hold up against a fully malicious server threat model. They uncover 12 attacks against Bitwarden, 7 against LastPass, and 6 against Dashlane, ranging from vault integrity violations to complete organizational vault compromise, with most attacks enabling password recovery. The paper identifies common design anti-patterns and cryptographic misconceptions, discusses mitigations, and offers broader lessons for developers of end-to-end encrypted systems. Findings have been disclosed to vendors and remediation is underway. Published at USENIX Security '26. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Schneier on Security](https://daily.dev/posts/schneier-on-security-y2yzqqslm) · Schneier on Security · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#cryptography](https://daily.dev/tags/cryptography) [View this post on daily.dev](https://daily.dev/posts/zero-knowledge-about-encryption-a-comparative-security-analysis-of-three-cloud-based-password-man-45rslxkyl) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Zero Knowledge (About) Encryption: A Comparative Security Analysis of Three Cloud-based Password Managers","url":"https://daily.dev/posts/zero-knowledge-about-encryption-a-comparative-security-analysis-of-three-cloud-based-password-man-45rslxkyl","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/zero-knowledge-about-encryption-a-comparative-security-analysis-of-three-cloud-based-password-man-45rslxkyl"},"datePublished":"2026-03-09T04:34:27.993Z","dateModified":"2026-03-09T04:34:52.222Z","description":"A cryptographic security research paper analyzing three major cloud-based password managers — Bitwarden, LastPass, and Dashlane — that collectively serve 60+...","image":"https://media.daily.dev/image/upload/s--foaA6JGU--/f_auto/v1722860399/public/Placeholder%2004","thumbnailUrl":"https://media.daily.dev/image/upload/s--foaA6JGU--/f_auto/v1722860399/public/Placeholder%2004","isAccessibleForFree":true,"articleSection":"Tech Lead Digest","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Tech Lead Digest","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/6ed1ee1a2e5c49f698265a6b2912b80d","url":"https://daily.dev/sources/techleaddigest"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/zero-knowledge-about-encryption-a-comparative-security-analysis-of-three-cloud-based-password-man-45rslxkyl","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"security,cryptography","timeRequired":"PT3M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Tech Lead Digest","item":"https://daily.dev/sources/techleaddigest"},{"@type":"ListItem","position":3,"name":"Zero Knowledge (About) Encryption: A Comparative Security Analysis of Three Cloud-based Password Managers"}]} ```