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    DownUnderCTF

    6 editions·235 challenges·2020–2025

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    202520242023202220212020
    Average—/5Vote and rate each challenge below.

    2025

    51 challengesCTFtime

    ai1

    ductfbank_1

    beginner10

    As_per_my_last_email...
    corporate_cliche
    Down_To_Modulate_Frequenciesi
    hungry_hungry_caterpillar
    kick_the_bucket
    Network_Disk_Forensics
    philtered
    secure_email_attachments
    stonks
    zeus

    crypto7

    certvalidated
    cheap_logs
    good_game_spawn_point
    good_game_well_played
    SH_RSA
    Speak_Friend_and_Enter
    yet_another_login

    misc7

    BeepBeep
    dualzip
    Fishy_Website
    Forensics_Golf
    Mary_had_a_little_lambda
    scrapbooking
    YoDawg

    osint4

    Look_at_all_those_chickensi
    Love_GranniE
    yippee
    Zer0C00l

    pwn8

    backdoor
    BLAST
    entangled
    entangled_revenge
    fakeobj.py
    Mysterious_Vault
    Rolling_Around
    rw.py

    rev6

    bilingual
    godot
    rocky
    skippy
    SwiftPasswordManager_ClickMe
    SwiftPasswordManager_LoadMe

    web8

    gomail
    legendary
    mini_me
    More_Request_Handling
    off_dah_rails_m8
    Request_Handling
    sodium
    Sweet_Treat

    2024

    56 challengesCTFtime

    crypto9

    AES
    decrypt_then_eval
    kyber_decryption_oracle
    my_array_generator
    Poly1305_OTM
    shufflebox
    super_party_computation
    three_line
    V_for_Vieta

    forensic5

    Babys_First_Forensics
    Bad_Policies
    emuc2
    Macro_Magic
    SAM_I_AM

    hw6

    Crash_Landing
    DUCTF
    I_See
    sirkit
    Sounds_Nice
    The_Door

    misc8

    DNAdecay
    Intercepted_Transmissions
    pkijs_eq
    pkijs_lt
    the_other_minimal_php
    tldr_please_summarise
    Wacky_Recipe
    WebSocket_VPN

    osint4

    Bridget_Lives
    cityviews
    offtheramp
    Theyre_Making_Decoys

    pwn7

    ESPecially_secure_boot
    Faulty_Kernel
    pac_shell
    sheep_farm_simulator
    sign_in
    vector_overflow
    yawa

    rev8

    adorable_encrypted_animal
    average_assembly_assignment
    dungeon
    number_mashing
    pressing_buttons
    rusty_vault
    sssshhhh
    Ternary_Brained

    web9

    co2
    co2v2
    hah_got_em
    i_am_confusion
    parrot_the_emu
    Prisoner_Processor
    sniffy
    waifu
    zoo_feedback_form

    2023

    54 challengesCTFtime

    blockchain4

    Another_Please
    Eight_Five_Four_Five
    Immutable
    Monkeing_Around

    crypto11

    apbq_rsa_i
    apbq_rsa_ii
    complementary
    dilithium
    encrypted_mail
    flag_art
    fnv
    handshake
    hhhhh
    lcg_card_gimmicks
    randomly_chosen

    misc10

    baby_ruby
    blinkybill
    daas
    impossible
    mini_dns_server
    My_First_C_Program
    Needle_In_IAM
    real_baby_ruby
    Smart_Calculator
    Welcome_to_DUCTF

    pwn10

    baby_crm
    binary_mail
    confusing
    downunderflow
    one_byte
    roppenheimer
    safe_calculator
    shifty_mem
    the_great_escape
    vroom_vroom

    rev8

    advanced_vector_expositions
    All_Fathers_Wisdom
    masked_squares_flag_checker
    number_theoretic_flag_checker
    pyny
    sideways
    SPACEGAME
    wrong_signal

    web11

    0day_blog
    actually_proxed
    cgi_fridays
    crossed_monkes
    grades_grades_grades
    proxed
    secure_blog
    smooth_jazz
    static_file_server
    strapi_in
    xxd_server

    2022

    38 challengesCTFtime

    blockchain4

    CryptoCasino
    PrivateLog
    SecretAndEphemeral
    SolveMe

    crypto11

    1337crypt-v3
    baby-arx
    cheap-ring-theory
    faulty-arx
    kyber
    oracle-for-block-cipher-enthusiasts
    rsa-interval-oracle-i
    rsa-interval-oracle-ii
    rsa-interval-oracle-iii
    rsa-interval-oracle-iv
    time-locked

    pwn10

    babypywn
    ezpz-pwn
    family-tree
    just-in-kernel
    kv_db
    login
    low-level-web
    optimal-vee-ate
    p0ison3d
    pac

    rev8

    artisan
    click_the_flag
    Clicky
    ezpz-rev
    js_lock
    LegitAppNotRansomware
    source_provided
    xva

    web5

    dyslexxec
    minimal-php
    no-symlink
    noteworthy
    sqli2022

    2021

    29 challengesCTFtime

    cloud1

    Lost_n_Found

    crypto9

    1337crypt_v2
    Break_Me
    power_sign
    Secuchat
    Substitution_Cipher_I
    Substitution_Cipher_II
    Substitution_Cipher_III
    treasure
    yadlp

    pwn9

    babygame
    deadcode
    DUCTFnote
    encrypted_note
    Leaking_like_a_sieve
    outBackdoor
    Oversight
    ready_bounce_pwn
    write_what_where

    rev7

    bullet_hell
    connect_the_dots
    flag_checker
    flag_loader
    flag_printer
    Juniperus
    no_strings

    web3

    Jasons_Proxy
    Notepad
    Zap

    2020

    7 challengesCTFtime

    misc7

    my-first-echo-server
    pwn-or-web
    return-to-what
    return-to-whats-revenge
    shellthis
    vecc
    zombie
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