[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10,"_11":12,"_13":14},"actionData","errors","root",{"_164":165,"_166":159},"routes/_root/_root",{"_161":-7,"_40":162,"_131":-7,"_163":-7},"routes/_root.challenges",{"_36":157,"_158":159,"_160":16},"routes/_root.challenges.$challengeCanonical+/_root",{"_62":63,"_64":65,"_66":67},"routes/_root.challenges.$challengeCanonical+/writeups",{"_15":16,"_17":16,"_18":19,"_20":21,"_22":23},"solved",false,"hasWriteup","writeups",[24,25,26],"name","flag.txt","canonicalName","flag-txt",{"_27":54,"_29":55,"_31":56,"_33":16,"_34":16,"_35":16,"_36":57,"_38":58,"_40":41,"_42":16,"_43":59},{"_27":47,"_29":48,"_31":49,"_33":16,"_34":16,"_35":16,"_36":50,"_38":51,"_40":41,"_42":16,"_43":52},{"_27":28,"_29":30,"_31":32,"_33":16,"_34":16,"_35":16,"_36":37,"_38":39,"_40":41,"_42":16,"_43":44},"author",{"_20":45,"_46":-5},"writeupElementId","fe71564d","writeupId","fe71564d-0d21-4988-9303-de741e375b05","canEdit","canLike","likedByViewer","title","Writeup for Daily AlpacaHack 3/9-3/15","url","https://pan-pudding.com/contents/1773749772437.html","language","ja","isOfficial","createdAt",["D",1773750208415],"labpump","gravatarHash",{"_20":53,"_46":-5},"da0b03ae","da0b03ae-da17-4d29-9ef7-5ab25949d50c","Writeup for flag.txt","https://github.com/baumroll0928-spec/myRepository/tree/main/DailyAlpacaHack/p20260315_flag.txt",["D",1773588983122],"baumroll1234",{"_20":60,"_46":61},"292878a1","292878a1-e71b-47e2-84c7-befa2d74d844","Writeup for Daily AlpacaHack 3/15-3/21","https://www.notion.so/kakur41-wrteup/Daily-AlpacaHack-3-15-3-21-32bda8520c0280008c6fdf4ada33eb29?source=copy_link",["D",1774151299097],"kakur41","b38a5e77015b23df77d112279a16aaba1c929e984106792bf5505dff367d67fa","challenge",{"_20":21,"_22":23,"_71":72,"_73":74,"_75":76,"_77":78,"_79":80,"_81":82,"_83":84,"_85":86,"_87":16,"_88":-7,"_89":90,"_91":-7,"_92":-7,"_35":16,"_93":94,"_95":96,"_97":16,"_98":-7,"_99":16,"_100":-7,"_101":-7,"_102":103,"_104":-7,"_105":-7,"_106":-7,"_107":108,"_109":16,"_110":108,"_34":108,"_111":-7,"_112":113,"_114":115,"_116":117,"_118":119},"availablePages",[68,69,70],"canonicalUrl","https://alpacahack.com/challenges/flag-txt","Description","Solves","Writeups","solves",117,"difficulty",45,"flagFormat","Alpaca{...}","categories",[154],"attachments",[148,149],"remote",{"_145":146,"_147":108},"description","🦙 < flag is in flag.txt\n\n

Beginner Hint 1 (AI-translated)

\n\n- From the problem statement, you can see that the flag is in flag.txt. However, if you try to download flag.txt, the download never finishes.\n- This is because the size of flag.txt is extremely large: 8192 PB. In fact, Chrome shows the remaining time as 2,147,483,647 days, so downloading the entire file is practically impossible.\n- If you extract source.tar.gz and check the distributed files, you will see that server.py creates a pseudo-large flag.txt.\n\n

\n\n

Beginner Hint 2 (AI-translated)

\n\n- Reading the comments in server.py, it says the contents of flag.txt are simply like `Flag is ....................Alpaca{REDACTED}!!!!!!!!!!!!!!!!!!!!`.\n- If you read the `read` function, you can confirm this behavior and see that the `.` and `!` parts are extremely long.\n- So how can you obtain the flag portion?\n\n

\n\n

Beginner Hint 3 (AI-translated)

\n\n- There is a mechanism to download only a part of a file. Try using it.\n- _This challenge is explained in Japanese on the YouTube channel \"Full Weak Engineer\"! _\n\n

\n","descriptionJa","🦙 < フラグは flag.txt にあるパカ\n\n

初心者向けヒント1

\n\n- **_YouTubeチャンネル『脆弱エンジニアの日常』でも、この問題の解説をしています！ _**\n- 問題文から flag.txt にフラグがあるとわかります。しかし、flag.txt のダウンロードを試みても全く終わりません。\n- これは flag.txt のサイズが 8192 PB と非常に大きいためです。実際、Chrome ではダウンロードまでの残り日数が 2147483647 日と表示され、ダウンロードすることは現実的に不可能です。\n- source.tar.gz を展開して配布ファイルを確認すると、 server.py において擬似的に巨大な flag.txt を作成していることがわかります。\n\n

\n\n

初心者向けヒント2

\n\n- server.py のコメントを読むと、flag.txt の中身は単に `Flag is ....................Alpaca{REDACTED}!!!!!!!!!!!!!!!!!!!!` のようになっていると書かれています。\n- 実際に `read` 関数を読むとその挙動を確認でき、 `.` と `!` の部分が非常に長く連なっていることがわかります。\n- では、どうすればフラグ部分を取得できるでしょうか？\n\n

\n\n

初心者向けヒント3

\n\n- ファイルの一部分だけダウンロードする仕組みがあります。それを活用してみましょう。\n\n

\n","descriptionRequiresSignIn","changeLog","authors",[142],"solvedAt","solvedAtInContext","ctfChallenges",[],"tags",[133,134,135],"submitAsCtfChallenge","ctfCanonical","ctfEnded","point","solvesCtfChallenge","classification","hard","isMirror","ctfParticipants","ctfMode","isDailyChallenge",true,"canCheckFlagWithoutSubmission","canCreateInstance","dailyProgramCanonicalForAction","previewProgramCanonicalForAction","daily-alpacahack","dailyChallengeSlot",{"_120":121,"_102":103,"_122":123,"_124":125,"_126":127,"_128":129},"nextDailyCanonical","the-future-path","httpsProxyHostname","flag-txt.chal.alp4ca.com","program",{"_22":113,"_20":130,"_131":132},"scheduledDate",["D",1773500400000],"releaseAt",["D",1773500400000],"status","PUBLISHED","plannedTopic","General","Daily AlpacaHack","timeZone","Asia/Tokyo",{"_20":140,"_22":141},{"_20":138,"_22":139},{"_20":136,"_22":137},"HTTP","http","Binary Search","binary-search","FUSE","fuse",{"_20":143,"_46":144},"minaminao","8923101afaa06c6be81216763685dbd0cac8ff24fbd6646250f67608d4924b02","instances",[],"canSpawn",{"_150":21,"_38":153},{"_150":151,"_38":152},"fileName","source.tar.gz","https://alpacahack-prod.s3.ap-northeast-1.amazonaws.com/76bf3bb9-0471-471b-b59d-5726f6785ee3/source.tar.gz","https://${HOSTNAME_HTTPS}/flag.txt",{"_20":155,"_22":156},"Misc","misc","Challenges","query","","isLoggedIn","user","en","timeZoneAbbr","clientConfig",{"_167":168,"_169":108,"_170":171,"_172":171,"_173":174,"_175":176,"_177":16,"_178":159},"cspNonce","firebaseOptions",{"_179":180,"_181":182,"_183":184,"_185":186,"_187":188,"_189":174},"isVercel","env","production","envName","gaTrackingId","G-FJX5L5Y9FE","turnstileSiteKey","0x4AAAAAAAfYTP7SUci3nVKW","isSpawnerUnderMaintenance","spawnerMaintenanceNotice","apiKey","AIzaSyDGInmUCFubPOqJWQCw3LBB-XZGj9LX4l4","appId","1:691353492123:web:4ae258ec8c620e63f0443e","projectId","alpacahack","authDomain","alpacahack.firebaseapp.com","messagingSenderId","691353492123","measurementId"]