[ctf-d] 우리는 grayD의 49개 음영을 가지고 있습니다. write-up

ubuntu 22.04 환경에서 풀이를 진행하였습니다.

 

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  -verbose             print detailed information about the image
  
$ identify -verbose ./shades.png
...
  Histogram:
    5420: (0,0,0) #000000 black
    5425: (5,5,5) #050505 grey2
    5405: (10,10,10) #0A0A0A grey4
    5438: (15,15,15) #0F0F0F grey6
    5286: (20,20,20) #141414 grey8
    5266: (25,25,25) #191919 srgb(25,25,25)
    5284: (30,30,30) #1E1E1E srgb(30,30,30)
    5316: (35,35,35) #232323 srgb(35,35,35)
    5263: (40,40,40) #282828 srgb(40,40,40)
    5318: (45,45,45) #2D2D2D srgb(45,45,45)
    5301: (50,50,50) #323232 srgb(50,50,50)
    5269: (55,55,55) #373737 srgb(55,55,55)
    5366: (60,60,60) #3C3C3C srgb(60,60,60)
    5306: (65,65,65) #414141 srgb(65,65,65)
    5362: (70,70,70) #464646 srgb(70,70,70)
    5408: (75,75,75) #4B4B4B srgb(75,75,75)
    5406: (85,85,85) #555555 srgb(85,85,85)
    5421: (90,90,90) #5A5A5A srgb(90,90,90)
    5396: (95,95,95) #5F5F5F srgb(95,95,95)
    5321: (100,100,100) #646464 srgb(100,100,100)
    5389: (105,105,105) #696969 DimGray
    5421: (110,110,110) #6E6E6E grey43
    5401: (115,115,115) #737373 grey45
    5317: (120,120,120) #787878 grey47
    5280: (125,125,125) #7D7D7D grey49
    5310: (130,130,130) #828282 grey51
    5418: (135,135,135) #878787 grey53
    5390: (140,140,140) #8C8C8C grey55
    5354: (145,145,145) #919191 grey57
    5210: (150,150,150) #969696 grey59
    5454: (155,155,155) #9B9B9B srgb(155,155,155)
    5226: (160,160,160) #A0A0A0 srgb(160,160,160)
    5342: (165,165,165) #A5A5A5 srgb(165,165,165)
    5375: (170,170,170) #AAAAAA srgb(170,170,170)
    5375: (175,175,175) #AFAFAF srgb(175,175,175)
    5374: (180,180,180) #B4B4B4 srgb(180,180,180)
    5326: (185,185,185) #B9B9B9 srgb(185,185,185)
    5472: (190,190,190) #BEBEBE grey
    5347: (195,195,195) #C3C3C3 srgb(195,195,195)
    5354: (200,200,200) #C8C8C8 srgb(200,200,200)
    5401: (205,205,205) #CDCDCD srgb(205,205,205)
    5223: (210,210,210) #D2D2D2 srgb(210,210,210)
    5346: (215,215,215) #D7D7D7 srgb(215,215,215)
    5259: (220,220,220) #DCDCDC gainsboro
    5413: (225,225,225) #E1E1E1 srgb(225,225,225)
    5320: (230,230,230) #E6E6E6 srgb(230,230,230)
    5381: (235,235,235) #EBEBEB grey92
    5368: (240,240,240) #F0F0F0 grey94
    5321: (245,245,245) #F5F5F5 grey96
  Rendering intent: Perceptual
  ...

(80,80,80) #505050이 빠져있습니다.

플래그 값은 505050입니다.