国城杯-misc-Tr4ffIc_w1th

打开流量包，发现主要是UDP流量，然后还有H264的视频数据

右击，UDP追踪流

然后更换为原始数据

另存为.ts的文件，打开就看到密码

!t15tH3^pAs5W#RD*f0RFL@9

打开压缩包是一个文件和一个图片

import numpy as np
import cv2
import sys
import random

def encode(input_image, output_image, seed):
    np.random.seed(seed)  
    to_hide = cv2.imread(input_image)
    
    if to_hide is None:
        print(f"Error: Unable to load image {input_image}")
        exit(1)
    
    to_hide_array = np.asarray(to_hide)

    row_indices = list(range(to_hide_array.shape[0]))
    col_indices = list(range(to_hide_array.shape[1]))

    np.random.shuffle(row_indices)
    np.random.shuffle(col_indices)

    to_hide_array = to_hide_array[row_indices, :]

    to_hide_array = to_hide_array[:, col_indices]

    gray = cv2.cvtColor(to_hide_array, cv2.COLOR_BGR2GRAY)
    cv2.imwrite(output_image, gray)
    print(f"Encoded image saved as {output_image}")

def main():
    if len(sys.argv) != 4:
        print('error! Please provide input image path, output image path, and seed as command-line arguments.')
        exit(1)
    
    input_image = sys.argv[1]
    output_image = sys.argv[2]
    seed = int(sys.argv[3])
    encode(input_image, output_image, seed)

if __name__ == '__main__':
    main()
#just 50 - 70

最下面的提示 50-70之间

编写一个解密脚本

import numpy as np
import cv2
import sys
import os

def decode(input_image, output_dir, seed_range):
    to_recover = cv2.imread(input_image, cv2.IMREAD_GRAYSCALE)
    
    if to_recover is None:
        print(f"Error: Unable to load image {input_image}")
        exit(1)

    to_recover_array = np.asarray(to_recover)
    
    for seed in seed_range:
        np.random.seed(seed)
        
        row_indices = list(range(to_recover_array.shape[0]))
        col_indices = list(range(to_recover_array.shape[1]))

        np.random.shuffle(row_indices)
        np.random.shuffle(col_indices)
        
        row_reverse = np.argsort(row_indices)
        col_reverse = np.argsort(col_indices)
        
        recovered_image = to_recover_array[row_reverse, :]
        recovered_image = recovered_image[:, col_reverse]

        output_image = os.path.join(output_dir, f"recovered_seed_{seed}.png")
        cv2.imwrite(output_image, recovered_image)
        print(f"Decoded image saved as {output_image}")

def main():
    if len(sys.argv) != 4:
        print('error! Please provide input image path, output directory, and seed range as command-line arguments.')
        exit(1)
    
    input_image = sys.argv[1]
    output_dir = sys.argv[2]
    seed_start = int(sys.argv[3].split('-')[0])  # start of seed range
    seed_end = int(sys.argv[3].split('-')[1])    # end of seed range
    
    if not os.path.exists(output_dir):
        os.makedirs(output_dir)

    seed_range = range(seed_start, seed_end + 1)
    decode(input_image, output_dir, seed_range)

if __name__ == '__main__':
    main()

运行上面的代码

python decode.py encoded.png ./recovered_images 50-70

找到了一个不一样的码，DataMatrix数据矩阵图

在网上在线解码

I randomly found a word list to encrypt the flag. I only remember that Wikipedia said this word list is similar to the NATO phonetic alphabet.

crumpled chairlift freedom chisel island dashboard crucial kickoff crucial chairlift drifter classroom highchair cranky clamshell edict drainage fallout clamshell chatter chairlift goldfish chopper eyetooth endow chairlift edict eyetooth deadbolt fallout egghead chisel eyetooth cranky crucial deadbolt chatter chisel egghead chisel crumpled eyetooth clamshell deadbolt chatter chopper eyetooth classroom chairlift fallout drainage klaxon

网上找了一下，是这个编码

一些杂乱的密码 - Gryffinbit的思维殿堂

aaa = [['00', 'aardvark', 'adroitness'], ['01', 'absurd', 'adviser'], ['02', 'accrue', 'aftermath'], ['03', 'acme', 'aggregate'], ['04', 'adrift', 'alkali'], ['05', 'adult', 'almighty'], ['06', 'afflict', 'amulet'], ['07', 'ahead', 'amusement'], ['08', 'aimless', 'antenna'], ['09', 'Algol', 'applicant'], ['0A', 'allow', 'Apollo'], ['0B', 'alone', 'armistice'], ['0C', 'ammo', 'article'], ['0D', 'ancient', 'asteroid'], ['0E', 'apple', 'Atlantic'], ['0F', 'artist', 'atmosphere'], ['10', 'assume', 'autopsy'], ['11', 'Athens', 'Babylon'], ['12', 'atlas', 'backwater'], ['13', 'Aztec', 'barbecue'], ['14', 'baboon', 'belowground'], ['15', 'backfield', 'bifocals'], ['16', 'backward', 'bodyguard'], ['17', 'banjo', 'bookseller'], ['18', 'beaming', 'borderline'], ['19', 'bedlamp', 'bottomless'], ['1A', 'beehive', 'Bradbury'], ['1B', 'beeswax', 'bravado'], ['1C', 'befriend', 'Brazilian'], ['1D', 'Belfast', 'breakaway'], ['1E', 'berserk', 'Burlington'], ['1F', 'billiard', 'businessman'], ['20', 'bison', 'butterfat'], ['21', 'blackjack', 'Camelot'], ['22', 'blockade', 'candidate'], ['23', 'blowtorch', 'cannonball'], ['24', 'bluebird', 'Capricorn'], ['25', 'bombast', 'caravan'], ['26', 'bookshelf', 'caretaker'], ['27', 'brackish', 'celebrate'], ['28', 'breadline', 'cellulose'], ['29', 'breakup', 'certify'], ['2A', 'brickyard', 'chambermaid'], ['2B', 'briefcase', 'Cherokee'], ['2C', 'Burbank', 'Chicago'], ['2D', 'button', 'clergyman'], ['2E', 'buzzard', 'coherence'], ['2F', 'cement', 'combustion'], ['30', 'chairlift', 'commando'], ['31', 'chatter', 'company'], ['32', 'checkup', 'component'], ['33', 'chisel', 'concurrent'], ['34', 'choking', 'confidence'], ['35', 'chopper', 'conformist'], ['36', 'Christmas', 'congregate'], ['37', 'clamshell', 'consensus'], ['38', 'classic', 'consulting'], ['39', 'classroom', 'corporate'], ['3A', 'cleanup', 'corrosion'], ['3B', 'clockwork', 'councilman'], ['3C', 'cobra', 'crossover'], ['3D', 'commence', 'crucifix'], ['3E', 'concert', 'cumbersome'], ['3F', 'cowbell', 'customer'], ['40', 'crackdown', 'Dakota'], ['41', 'cranky', 'decadence'], ['42', 'crowfoot', 'December'], ['43', 'crucial', 'decimal'], ['44', 'crumpled', 'designing'], ['45', 'crusade', 'detector'], ['46', 'cubic', 'detergent'], ['47', 'dashboard', 'determine'], ['48', 'deadbolt', 'dictator'], ['49', 'deckhand', 'dinosaur'], ['4A', 'dogsled', 'direction'], ['4B', 'dragnet', 'disable'], ['4C', 'drainage', 'disbelief'], ['4D', 'dreadful', 'disruptive'], ['4E', 'drifter', 'distortion'], ['4F', 'dropper', 'document'], ['50', 'drumbeat', 'embezzle'], ['51', 'drunken', 'enchanting'], ['52', 'Dupont', 'enrollment'], ['53', 'dwelling', 'enterprise'], ['54', 'eating', 'equation'], ['55', 'edict', 'equipment'], ['56', 'egghead', 'escapade'], ['57', 'eightball', 'Eskimo'], ['58', 'endorse', 'everyday'], ['59', 'endow', 'examine'], ['5A', 'enlist', 'existence'], ['5B', 'erase', 'exodus'], ['5C', 'escape', 'fascinate'], ['5D', 'exceed', 'filament'], ['5E', 'eyeglass', 'finicky'], ['5F', 'eyetooth', 'forever'], ['60', 'facial', 'fortitude'], ['61', 'fallout', 'frequency'], ['62', 'flagpole', 'gadgetry'], ['63', 'flatfoot', 'Galveston'], ['64', 'flytrap', 'getaway'], ['65', 'fracture', 'glossary'], ['66', 'framework', 'gossamer'], ['67', 'freedom', 'graduate'], ['68', 'frighten', 'gravity'], ['69', 'gazelle', 'guitarist'], ['6A', 'Geiger', 'hamburger'], ['6B', 'glitter', 'Hamilton'], ['6C', 'glucose', 'handiwork'], ['6D', 'goggles', 'hazardous'], ['6E', 'goldfish', 'headwaters'], ['6F', 'gremlin', 'hemisphere'], ['70', 'guidance', 'hesitate'], ['71', 'hamlet', 'hideaway'], ['72', 'highchair', 'holiness'], ['73', 'hockey', 'hurricane'], ['74', 'indoors', 'hydraulic'], ['75', 'indulge', 'impartial'], ['76', 'inverse', 'impetus'], ['77', 'involve', 'inception'], ['78', 'island', 'indigo'], ['79', 'jawbone', 'inertia'], ['7A', 'keyboard', 'infancy'], ['7B', 'kickoff', 'inferno'], ['7C', 'kiwi', 'informant'], ['7D', 'klaxon', 'insincere'], ['7E', 'locale', 'insurgent'], ['7F', 'lockup', 'integrate'], ['80', 'merit', 'intention'], ['81', 'minnow', 'inventive'], ['82', 'miser', 'Istanbul'], ['83', 'Mohawk', 'Jamaica'], ['84', 'mural', 'Jupiter'], ['85', 'music', 'leprosy'], ['86', 'necklace', 'letterhead'], ['87', 'Neptune', 'liberty'], ['88', 'newborn', 'maritime'], ['89', 'nightbird', 'matchmaker'], ['8A', 'Oakland', 'maverick'], ['8B', 'obtuse', 'Medusa'], ['8C', 'offload', 'megaton'], ['8D', 'optic', 'microscope'], ['8E', 'orca', 'microwave'], ['8F', 'payday', 'midsummer'], ['90', 'peachy', 'millionaire'], ['91', 'pheasant', 'miracle'], ['92', 'physique', 'misnomer'], ['93', 'playhouse', 'molasses'], ['94', 'Pluto', 'molecule'], ['95', 'preclude', 'Montana'], ['96', 'prefer', 'monument'], ['97', 'preshrunk', 'mosquito'], ['98', 'printer', 'narrative'], ['99', 'prowler', 'nebula'], ['9A', 'pupil', 'newsletter'], ['9B', 'puppy', 'Norwegian'], ['9C', 'python', 'October'], ['9D', 'quadrant', 'Ohio'], ['9E', 'quiver', 'onlooker'], ['9F', 'quota', 'opulent'], ['A0', 'ragtime', 'Orlando'], ['A1', 'ratchet', 'outfielder'], ['A2', 'rebirth', 'Pacific'], ['A3', 'reform', 'pandemic'], ['A4', 'regain', 'Pandora'], ['A5', 'reindeer', 'paperweight'], ['A6', 'rematch', 'paragon'], ['A7', 'repay', 'paragraph'], ['A8', 'retouch', 'paramount'], ['A9', 'revenge', 'passenger'], ['AA', 'reward', 'pedigree'], ['AB', 'rhythm', 'Pegasus'], ['AC', 'ribcage', 'penetrate'], ['AD', 'ringbolt', 'perceptive'], ['AE', 'robust', 'performance'], ['AF', 'rocker', 'pharmacy'], ['B0', 'ruffled', 'phonetic'], ['B1', 'sailboat', 'photograph'], ['B2', 'sawdust', 'pioneer'], ['B3', 'scallion', 'pocketful'], ['B4', 'scenic', 'politeness'], ['B5', 'scorecard', 'positive'], ['B6', 'Scotland', 'potato'], ['B7', 'seabird', 'processor'], ['B8', 'select', 'provincial'], ['B9', 'sentence', 'proximate'], ['BA', 'shadow', 'puberty'], ['BB', 'shamrock', 'publisher'], ['BC', 'showgirl', 'pyramid'], ['BD', 'skullcap', 'quantity'], ['BE', 'skydive', 'racketeer'], ['BF', 'slingshot', 'rebellion'], ['C0', 'slowdown', 'recipe'], ['C1', 'snapline', 'recover'], ['C2', 'snapshot', 'repellent'], ['C3', 'snowcap', 'replica'], ['C4', 'snowslide', 'reproduce'], ['C5', 'solo', 'resistor'], ['C6', 'southward', 'responsive'], ['C7', 'soybean', 'retraction'], ['C8', 'spaniel', 'retrieval'], ['C9', 'spearhead', 'retrospect'], ['CA', 'spellbind', 'revenue'], ['CB', 'spheroid', 'revival'], ['CC', 'spigot', 'revolver'], ['CD', 'spindle', 'sandalwood'], ['CE', 'spyglass', 'sardonic'], ['CF', 'stagehand', 'Saturday'], ['D0', 'stagnate', 'savagery'], ['D1', 'stairway', 'scavenger'], ['D2', 'standard', 'sensation'], ['D3', 'stapler', 'sociable'], ['D4', 'steamship', 'souvenir'], ['D5', 'sterling', 'specialist'], ['D6', 'stockman', 'speculate'], ['D7', 'stopwatch', 'stethoscope'], ['D8', 'stormy', 'stupendous'], ['D9', 'sugar', 'supportive'], ['DA', 'surmount', 'surrender'], ['DB', 'suspense', 'suspicious'], ['DC', 'sweatband', 'sympathy'], ['DD', 'swelter', 'tambourine'], ['DE', 'tactics', 'telephone'], ['DF', 'talon', 'therapist'], ['E0', 'tapeworm', 'tobacco'], ['E1', 'tempest', 'tolerance'], ['E2', 'tiger', 'tomorrow'], ['E3', 'tissue', 'torpedo'], ['E4', 'tonic', 'tradition'], ['E5', 'topmost', 'travesty'], ['E6', 'tracker', 'trombonist'], ['E7', 'transit', 'truncated'], ['E8', 'trauma', 'typewriter'], ['E9', 'treadmill', 'ultimate'], ['EA', 'Trojan', 'undaunted'], ['EB', 'trouble', 'underfoot'], ['EC', 'tumor', 'unicorn'], ['ED', 'tunnel', 'unify'], ['EE', 'tycoon', 'universe'], ['EF', 'uncut', 'unravel'], ['F0', 'unearth', 'upcoming'], ['F1', 'unwind', 'vacancy'], ['F2', 'uproot', 'vagabond'], ['F3', 'upset', 'vertigo'], ['F4', 'upshot', 'Virginia'], ['F5', 'vapor', 'visitor'], ['F6', 'village', 'vocalist'], ['F7', 'virus', 'voyager'], ['F8', 'Vulcan', 'warranty'], ['F9', 'waffle', 'Waterloo'], ['FA', 'wallet', 'whimsical'], ['FB', 'watchword', 'Wichita'], ['FC', 'wayside', 'Wilmington'], ['FD', 'willow', 'Wyoming'], ['FE', 'woodlark', 'yesteryear'], ['FF', 'Zulu', 'Yucatan']]

_string = "crumpled chairlift freedom chisel island dashboard crucial kickoff crucial chairlift drifter classroom highchair cranky clamshell edict drainage fallout clamshell chatter chairlift goldfish chopper eyetooth endow chairlift edict eyetooth deadbolt fallout egghead chisel eyetooth cranky crucial deadbolt chatter chisel egghead chisel crumpled eyetooth clamshell deadbolt chatter chopper eyetooth classroom chairlift fallout drainage klaxon"

def tihuan(s):
    for i in aaa:
        s = s.replace(i[1],i[0])
        s = s.replace(i[2],i[0])
    return s

bbb = tihuan(_string)
print(bbb)
ccc = bbb.split(" ")
ddd = ""
for i in ccc:
    ddd+=chr(int(i,16))

print(ddd)

解出flag