--- title: The Most Backdoor-Looking Bug I’ve Ever Seen | daily.dev description: The post discusses a bug in Telegram's self-rolled cryptographic protocol that allowed for an undetected Person-in-the-Middle attack. The bug was fixed by... canonical: https://daily.dev/posts/the-most-backdoor-looking-bug-i-ve-ever-seen-lt906puu7 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: The Most Backdoor-Looking Bug I’ve Ever Seen | daily.dev og:description: The post discusses a bug in Telegram's self-rolled cryptographic protocol that allowed for an undetected Person-in-the-Middle attack. The bug was fixed by... og:url: https://daily.dev/posts/the-most-backdoor-looking-bug-i-ve-ever-seen-lt906puu7 og:image: https://api.daily.dev/og/posts/lT906pUU7.png og:image:alt: The Most Backdoor-Looking Bug I’ve Ever Seen 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. # The Most Backdoor-Looking Bug I’ve Ever Seen **[Hacker News](https://daily.dev/sources/hn)** · 6 min read · 2 upvotes · 0 comments ## Summary The post discusses a bug in Telegram's self-rolled cryptographic protocol that allowed for an undetected Person-in-the-Middle attack. The bug was fixed by removing a useless addition in the protocol. The post also highlights the issues with trusting Telegram's encryption. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#telegram](https://daily.dev/tags/telegram) [View this post on daily.dev](https://daily.dev/posts/the-most-backdoor-looking-bug-i-ve-ever-seen-lt906puu7) ```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":"The Most Backdoor-Looking Bug I’ve Ever Seen","url":"https://daily.dev/posts/the-most-backdoor-looking-bug-i-ve-ever-seen-lt906puu7","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/the-most-backdoor-looking-bug-i-ve-ever-seen-lt906puu7"},"datePublished":"2024-05-10T06:14:38.481Z","dateModified":"2024-05-10T06:14:36.900Z","description":"The post discusses a bug in Telegram's self-rolled cryptographic protocol that allowed for an undetected Person-in-the-Middle attack. The bug was fixed by...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/f86cb4d94d4fdac88a723ac1dea9f759?_a=AQAEuiZ","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/f86cb4d94d4fdac88a723ac1dea9f759?_a=AQAEuiZ","isAccessibleForFree":true,"articleSection":"Hacker News","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":"Hacker News","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/hn","url":"https://daily.dev/sources/hn"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/the-most-backdoor-looking-bug-i-ve-ever-seen-lt906puu7","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"telegram","timeRequired":"PT6M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hacker News","item":"https://daily.dev/sources/hn"},{"@type":"ListItem","position":3,"name":"The Most Backdoor-Looking Bug I’ve Ever Seen"}]} ```