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          data-hydro-click="{&quot;event_type&quot;:&quot;authentication.click&quot;,&quot;payload&quot;:{&quot;location_in_page&quot;:&quot;site header menu&quot;,&quot;repository_id&quot;:null,&quot;auth_type&quot;:&quot;SIGN_UP&quot;,&quot;originating_url&quot;:&quot;https://github.com/not1cyyy/CTF-Writeups/wiki/PicoCTF-:-st3g0&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="5ca772726ed8d43abba693102a588bb92accf1adbdf8e0e8ed4fd4f484c81299"
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          class="HeaderMenu-link HeaderMenu-link--sign-up flex-shrink-0 d-none d-lg-inline-block no-underline border color-border-default rounded px-2 py-1"
          data-hydro-click="{&quot;event_type&quot;:&quot;authentication.click&quot;,&quot;payload&quot;:{&quot;location_in_page&quot;:&quot;site header menu&quot;,&quot;repository_id&quot;:null,&quot;auth_type&quot;:&quot;SIGN_UP&quot;,&quot;originating_url&quot;:&quot;https://github.com/not1cyyy/CTF-Writeups/wiki/PicoCTF-:-st3g0&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="5ca772726ed8d43abba693102a588bb92accf1adbdf8e0e8ed4fd4f484c81299"
          data-analytics-event="{&quot;category&quot;:&quot;Sign up&quot;,&quot;action&quot;:&quot;click to sign up for account&quot;,&quot;label&quot;:&quot;ref_page:/&lt;user-name&gt;/&lt;repo-name&gt;/wiki/show;ref_cta:Sign up;ref_loc:header logged out&quot;}"
        >
          Sign up
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</div> </header>

</div>

<div id="start-of-content" class="show-on-focus"></div>

<div id="js-flash-container" data-turbo-replace>

<template class="js-flash-template">

<div class="flash flash-full {{ className }}"> <div class="px-2" > <button autofocus class="flash-close js-flash-close" type="button" aria-label="Dismiss this message"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg> </button> <div aria-atomic="true" role="alert" class="js-flash-alert">

  <div>{{ message }}</div>

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<include-fragment class="js-notification-shelf-include-fragment" data-base-src="https://github.com/notifications/beta/shelf"></include-fragment>

<div class="application-main " data-commit-hovercards-enabled data-discussion-hovercards-enabled data-issue-and-pr-hovercards-enabled

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<div class=" d-flex flex-wrap flex-items-center wb-break-word f3 text-normal"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo color-fg-muted mr-2"> <path d="M2 2.5A2.5 2.5 0 0 1 4.5 0h8.75a.75.75 0 0 1 .75.75v12.5a.75.75 0 0 1-.75.75h-2.5a.75.75 0 0 1 0-1.5h1.75v-2h-8a1 1 0 0 0-.714 1.7.75.75 0 1 1-1.072 1.05A2.495 2.495 0 0 1 2 11.5Zm10.5-1h-8a1 1 0 0 0-1 1v6.708A2.486 2.486 0 0 1 4.5 9h8ZM5 12.25a.25.25 0 0 1 .25-.25h3.5a.25.25 0 0 1 .25.25v3.25a.25.25 0 0 1-.4.2l-1.45-1.087a.249.249 0 0 0-.3 0L5.4 15.7a.25.25 0 0 1-.4-.2Z"></path> </svg>

<span class="author flex-self-stretch" itemprop="author">
  <a class="url fn" rel="author" data-hovercard-type="user" data-hovercard-url="/users/not1cyyy/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/not1cyyy">
    not1cyyy

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<span></span><span class="Label Label--secondary v-align-middle mr-1">Public</span>

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<li> <a href="/login?return_to=%2Fnot1cyyy%2FCTF-Writeups" rel="nofollow" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"notification subscription menu watch","repository_id":null,"auth_type":"LOG_IN","originating_url":"https://github.com/not1cyyy/CTF-Writeups/wiki/PicoCTF-:-st3g0","user_id":null}}" data-hydro-click-hmac="290073a9008b68d789b0c50746e1d3d0e688fc340ad65671583a6d477f9a6710" aria-label="You must be signed in to change notification settings" data-view-component="true" class="tooltipped tooltipped-s btn-sm btn"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-bell mr-2"> <path d="M8 16a2 2 0 0 0 1.985-1.75c.017-.137-.097-.25-.235-.25h-3.5c-.138 0-.252.113-.235.25A2 2 0 0 0 8 16ZM3 5a5 5 0 0 1 10 0v2.947c0 .05.015.098.042.139l1.703 2.555A1.519 1.519 0 0 1 13.482 13H2.518a1.516 1.516 0 0 1-1.263-2.36l1.703-2.554A.255.255 0 0 0 3 7.947Zm5-3.5A3.5 3.5 0 0 0 4.5 5v2.947c0 .346-.102.683-.294.97l-1.703 2.556a.017.017 0 0 0-.003.01l.001.006c0 .002.002.004.004.006l.006.004.007.001h10.964l.007-.001.006-.004.004-.006.001-.007a.017.017 0 0 0-.003-.01l-1.703-2.554a1.745 1.745 0 0 1-.294-.97V5A3.5 3.5 0 0 0 8 1.5Z"></path> </svg>Notifications </a> </li>

<li> <a icon="repo-forked" id="fork-button" href="/login?return_to=%2Fnot1cyyy%2FCTF-Writeups" rel="nofollow" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"repo details fork button","repository_id":481769760,"auth_type":"LOG_IN","originating_url":"https://github.com/not1cyyy/CTF-Writeups/wiki/PicoCTF-:-st3g0","user_id":null}}" data-hydro-click-hmac="e96e2fbda2d1481954df570feb62a7a7123d3ad97f97817975b2187e6904f6db" data-view-component="true" class="btn-sm btn"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg>Fork <span id="repo-network-counter" data-pjax-replace="true" data-turbo-replace="true" title="0" data-view-component="true" class="Counter">0</span> </a> </li>

<li> <div data-view-component="true" class="BtnGroup d-flex"> <a href="/login?return_to=%2Fnot1cyyy%2FCTF-Writeups" rel="nofollow" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"star button","repository_id":481769760,"auth_type":"LOG_IN","originating_url":"https://github.com/not1cyyy/CTF-Writeups/wiki/PicoCTF-:-st3g0","user_id":null}}" data-hydro-click-hmac="f3dd40dd0735aefc6e829a4e3fea4b8961456216ddf463073010b0d7244a8f68" aria-label="You must be signed in to star a repository" data-view-component="true" class="tooltipped tooltipped-s btn-sm btn BtnGroup-item"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-star v-align-text-bottom d-inline-block mr-2"> <path d="M8 .25a.75.75 0 0 1 .673.418l1.882 3.815 4.21.612a.75.75 0 0 1 .416 1.279l-3.046 2.97.719 4.192a.751.751 0 0 1-1.088.791L8 12.347l-3.766 1.98a.75.75 0 0 1-1.088-.79l.72-4.194L.818 6.374a.75.75 0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg><span data-view-component="true" class="d-inline"> Star </span> <span id="repo-stars-counter-star" aria-label="7 users starred this repository" data-singular-suffix="user starred this repository" data-plural-suffix="users starred this repository" data-turbo-replace="true" title="7" data-view-component="true" class="Counter js-social-count">7</span> </a> <button disabled="disabled" aria-label="You must be signed in to add this repository to a list" type="button" data-view-component="true" class="btn-sm btn BtnGroup-item px-2"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-triangle-down"> <path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path> </svg> </button></div> </li>

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<summary> <div class="d-flex flex-items-start"> <div class="p-2 mt-n1 mb-n1 ml-n1 btn btn-octicon js-wiki-sidebar-toc-toggle-chevron-button "> <svg hidden="hidden" style="box-sizing: content-box; color: var(--color-icon-primary);" width="16" height="16" viewBox="0 0 16 16" fill="none" data-view-component="true" class="js-wiki-sidebar-toc-spinner mr-0 v-align-text-bottom anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-triangle-down js-wiki-sidebar-toc-toggle-chevron mr-0"> <path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path> </svg> </div> <span data-view-component="true" class="Truncate"> <a href="/not1cyyy/CTF-Writeups/wiki/PicoCTF-:-Sleuthkit-Apprentice" data-view-component="true" class="Truncate-text text-bold py-1">PicoCTF : Sleuthkit Apprentice</a> </span> </div> </summary>

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<summary> <div class="d-flex flex-items-start"> <div class="p-2 mt-n1 mb-n1 ml-n1 btn btn-octicon js-wiki-sidebar-toc-toggle-chevron-button "> <svg hidden="hidden" style="box-sizing: content-box; color: var(--color-icon-primary);" width="16" height="16" viewBox="0 0 16 16" fill="none" data-view-component="true" class="js-wiki-sidebar-toc-spinner mr-0 v-align-text-bottom anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-triangle-down js-wiki-sidebar-toc-toggle-chevron js-wiki-sidebar-toc-toggle-chevron-open mr-0"> <path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path> </svg> </div> <span data-view-component="true" class="Truncate"> <a href="/not1cyyy/CTF-Writeups/wiki/PicoCTF-:-st3g0" data-view-component="true" class="Truncate-text text-bold py-1">PicoCTF : st3g0</a> </span> </div> </summary>

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<summary> <div class="d-flex flex-items-start"> <div class="p-2 mt-n1 mb-n1 ml-n1 btn btn-octicon js-wiki-sidebar-toc-toggle-chevron-button "> <svg hidden="hidden" style="box-sizing: content-box; color: var(--color-icon-primary);" width="16" height="16" viewBox="0 0 16 16" fill="none" data-view-component="true" class="js-wiki-sidebar-toc-spinner mr-0 v-align-text-bottom anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-triangle-down js-wiki-sidebar-toc-toggle-chevron mr-0"> <path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path> </svg> </div> <span data-view-component="true" class="Truncate"> <a href="/not1cyyy/CTF-Writeups/wiki/PicoCTF-:-Transposition-Trial" data-view-component="true" class="Truncate-text text-bold py-1">PicoCTF : Transposition Trial</a> </span> </div> </summary>

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<summary> <div class="d-flex flex-items-start"> <div class="p-2 mt-n1 mb-n1 ml-n1 btn btn-octicon js-wiki-sidebar-toc-toggle-chevron-button "> <svg hidden="hidden" style="box-sizing: content-box; color: var(--color-icon-primary);" width="16" height="16" viewBox="0 0 16 16" fill="none" data-view-component="true" class="js-wiki-sidebar-toc-spinner mr-0 v-align-text-bottom anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-triangle-down js-wiki-sidebar-toc-toggle-chevron mr-0"> <path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path> </svg> </div> <span data-view-component="true" class="Truncate"> <a href="/not1cyyy/CTF-Writeups/wiki/Space-Heroes-CTF-:-Information-Paradox" data-view-component="true" class="Truncate-text text-bold py-1">Space Heroes CTF : Information Paradox</a> </span> </div> </summary>

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<summary> <div class="d-flex flex-items-start"> <div class="p-2 mt-n1 mb-n1 ml-n1 btn btn-octicon js-wiki-sidebar-toc-toggle-chevron-button "> <svg hidden="hidden" style="box-sizing: content-box; color: var(--color-icon-primary);" width="16" height="16" viewBox="0 0 16 16" fill="none" data-view-component="true" class="js-wiki-sidebar-toc-spinner mr-0 v-align-text-bottom anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-triangle-down js-wiki-sidebar-toc-toggle-chevron mr-0"> <path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path> </svg> </div> <span data-view-component="true" class="Truncate"> <a href="/not1cyyy/CTF-Writeups/wiki/Space-Heroes-CTF-:-Invisible-Stargate" data-view-component="true" class="Truncate-text text-bold py-1">Space Heroes CTF : Invisible Stargate</a> </span> </div> </summary>

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        <h5 class="mt-0 mb-2">Clone this wiki locally</h5>
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<path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path>

</svg> <svg style="display: none;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check color-fg-success"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </span> </div> </div> </div> <div data-view-component="true" class="Layout-main"> <div id="wiki-body" class="gollum-markdown-content"> <div class="markdown-body"> <h1><a id="user-content-description" class="anchor" aria-hidden="true" href="#description"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a>Description</h1> <p>Download this image and find the flag.</p> <p><img src="https://user-images.githubusercontent.com/101048320/163683023-dfb8bc74-8821-4909-a35b-ae1b86e3b5f1.png" alt="Screenshot from 2022-04-16 17-18-16"></p> <p>Hint : We know the end sequence of the message will be t3g0.</p>
<h2><a id="user-content-files" class="anchor" aria-hidden="true" href="#files"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a>Files</h2>
<ul>
<li>pico.flag.png</li>
</ul>
<p><img src="https://user-images.githubusercontent.com/101048320/163683081-5de71c2c-e992-4f56-a919-835d2ac46725.png" alt="pico flag"></p>
<h1><a id="user-content-solution" class="anchor" aria-hidden="true" href="#solution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a>Solution</h1>
<h2><a id="user-content-recon" class="anchor" aria-hidden="true" href="#recon"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a>Recon</h2>
<ul>
<li>
t3g0 ? isn't that LSB encoding ?</li> </ul> <h2><a id="user-content-execution" class="anchor" aria-hidden="true" href="#execution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a>Execution</h2> <p>I had this python script that was laying in one of my previous ctf challenges that can decode LSB so I ran it against the image :</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="#import libraries import sys import numpy as np from PIL import Image np.set_printoptions(threshold=sys.maxsize)

#encoding function def Encode(src, message, dest):

img = Image.open(src, 'r')
width, height = img.size
array = np.array(list(img.getdata()))

if img.mode == 'RGB':
    n = 3
elif img.mode == 'RGBA':
    n = 4

total_pixels = array.size//n

message += &quot;$t3g0&quot;
b_message = ''.join([format(ord(i), &quot;08b&quot;) for i in message])
req_pixels = len(b_message)

if req_pixels &gt; total_pixels:
    print(&quot;ERROR: Need larger file size&quot;)

else:
    index=0
    for p in range(total_pixels):
        for q in range(0, 3):
            if index &lt; req_pixels:
                array[p][q] = int(bin(array[p][q])[2:9] + b_message[index], 2)
                index += 1

    array=array.reshape(height, width, n)
    enc_img = Image.fromarray(array.astype('uint8'), img.mode)
    enc_img.save(dest)
    print(&quot;Image Encoded Successfully&quot;)

#decoding function def Decode(src):

img = Image.open(src, 'r')
array = np.array(list(img.getdata()))

if img.mode == 'RGB':
    n = 3
elif img.mode == 'RGBA':
    n = 4

total_pixels = array.size//n

hidden_bits = &quot;&quot;
for p in range(total_pixels):
    for q in range(0, 3):
        hidden_bits += (bin(array[p][q])[2:][-1])

hidden_bits = [hidden_bits[i:i+8] for i in range(0, len(hidden_bits), 8)]

message = &quot;&quot;
for i in range(len(hidden_bits)):
    if message[-5:] == &quot;$t3g0&quot;:
        break
    else:
        message += chr(int(hidden_bits[i], 2))
if &quot;$t3g0&quot; in message:
    print(&quot;Hidden Message:&quot;, message[:-5])
else:
    print(&quot;No Hidden Message Found&quot;)

#main function def Stego(): print("--Welcome to $t3g0--") print("1: Encode") print("2: Decode")

func = input()

if func == '1':
    print(&quot;Enter Source Image Path&quot;)
    src = input()
    print(&quot;Enter Message to Hide&quot;)
    message = input()
    print(&quot;Enter Destination Image Path&quot;)
    dest = input()
    print(&quot;Encoding...&quot;)
    Encode(src, message, dest)

elif func == '2':
    print(&quot;Enter Source Image Path&quot;)
    src = input()
    print(&quot;Decoding...&quot;)
    Decode(src)

else:
    print(&quot;ERROR: Invalid option chosen&quot;)

Stego()"><pre class="notranslate"><code>#import libraries import sys import numpy as np from PIL import Image np.set_printoptions(threshold=sys.maxsize)

#encoding function def Encode(src, message, dest):

img = Image.open(src, 'r')
width, height = img.size
array = np.array(list(img.getdata()))

if img.mode == 'RGB':
    n = 3
elif img.mode == 'RGBA':
    n = 4

total_pixels = array.size//n

message += "$t3g0"
b_message = ''.join([format(ord(i), "08b") for i in message])
req_pixels = len(b_message)

if req_pixels &gt; total_pixels:
    print("ERROR: Need larger file size")

else:
    index=0
    for p in range(total_pixels):
        for q in range(0, 3):
            if index &lt; req_pixels:
                array[p][q] = int(bin(array[p][q])[2:9] + b_message[index], 2)
                index += 1

    array=array.reshape(height, width, n)
    enc_img = Image.fromarray(array.astype('uint8'), img.mode)
    enc_img.save(dest)
    print("Image Encoded Successfully")

#decoding function def Decode(src):

img = Image.open(src, 'r')
array = np.array(list(img.getdata()))

if img.mode == 'RGB':
    n = 3
elif img.mode == 'RGBA':
    n = 4

total_pixels = array.size//n

hidden_bits = ""
for p in range(total_pixels):
    for q in range(0, 3):
        hidden_bits += (bin(array[p][q])[2:][-1])

hidden_bits = [hidden_bits[i:i+8] for i in range(0, len(hidden_bits), 8)]

message = ""
for i in range(len(hidden_bits)):
    if message[-5:] == "$t3g0":
        break
    else:
        message += chr(int(hidden_bits[i], 2))
if "$t3g0" in message:
    print("Hidden Message:", message[:-5])
else:
    print("No Hidden Message Found")

#main function def Stego(): print("--Welcome to $t3g0--") print("1: Encode") print("2: Decode")

func = input()

if func == '1':
    print("Enter Source Image Path")
    src = input()
    print("Enter Message to Hide")
    message = input()
    print("Enter Destination Image Path")
    dest = input()
    print("Encoding...")
    Encode(src, message, dest)

elif func == '2':
    print("Enter Source Image Path")
    src = input()
    print("Decoding...")
    Decode(src)

else:
    print("ERROR: Invalid option chosen")

Stego() </code></pre></div> <p>Or alternatively, we can run <code>Zsteg</code> against the image and we get the same output ! it's as easy as that !</p> <h1><a id="user-content-flag" class="anchor" aria-hidden="true" href="#flag"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a>Flag</h1> <p>picoCTF{7h3r3_15_n0_5p00n_87ef5b0b}</p>

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Original writeup (https://github.com/not1cyyy/CTF-Writeups/wiki/PicoCTF-:-st3g0).