CpawCTF Q10.[Forensics] River
問題から.jpgをダウンロードし、Ubuntuで解析していきます。
まず、exiftoolコマンドで解析していきましょう。
exiftool.ub
>exiftool river.jpg
ExifTool Version Number : 12.40
File Name : river.jpg
Directory : .
File Size : 414 KiB
File Modification Date/Time : 2024:02:12 19:46:07+09:00
File Access Date/Time : 2024:02:12 19:46:59+09:00
File Inode Change Date/Time : 2024:02:12 19:46:59+09:00
File Permissions : -rw-r--r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.01
Exif Byte Order : Big-endian (Motorola, MM)
Make : Sony
Camera Model Name : SO-01G
Orientation : Horizontal (normal)
X Resolution : 72
Y Resolution : 72
Resolution Unit : inches
Software : 23.1.B.1.160_6_f1000010
Modify Date : 2015:09:14 12:50:38
Exposure Time : 1/2000
F Number : 2.0
ISO : 50
Exif Version : 0220
Date/Time Original : 2015:09:14 12:50:38
Create Date : 2015:09:14 12:50:38
Components Configuration : Y, Cb, Cr, -
Shutter Speed Value : 1/1992
Exposure Compensation : 0
Metering Mode : Multi-segment
Light Source : Unknown
Flash : Off, Did not fire
Focal Length : 4.6 mm
Sub Sec Time : 190234
Sub Sec Time Original : 190234
Sub Sec Time Digitized : 190234
Flashpix Version : 0100
Color Space : sRGB
Exif Image Width : 3840
Exif Image Height : 2160
Custom Rendered : Normal
Exposure Mode : Auto
White Balance : Auto
Digital Zoom Ratio : 1
Scene Capture Type : Landscape
Subject Distance Range : Unknown
GPS Version ID : 2.3.0.0
GPS Latitude Ref : North
GPS Longitude Ref : East
XMP Toolkit : XMP Core 5.4.0
Creator Tool : 23.1.B.1.160_6_f1000010
Current IPTC Digest : d5bc65b4a8aa881aa3cbcb4c82d92707
Coded Character Set : UTF8
Application Record Version : 2
Digital Creation Time : 12:50:38
Digital Creation Date : 2015:09:14
Date Created : 2015:09:14
Time Created : 12:50:38
IPTC Digest : d5bc65b4a8aa881aa3cbcb4c82d92707
Profile CMM Type : Linotronic
Profile Version : 2.1.0
Profile Class : Display Device Profile
Color Space Data : RGB
Profile Connection Space : XYZ
Profile Date Time : 1998:02:09 06:49:00
Profile File Signature : acsp
Primary Platform : Microsoft Corporation
CMM Flags : Not Embedded, Independent
Device Manufacturer : Hewlett-Packard
Device Model : sRGB
Device Attributes : Reflective, Glossy, Positive, Color
Rendering Intent : Perceptual
Connection Space Illuminant : 0.9642 1 0.82491
Profile Creator : Hewlett-Packard
Profile ID : 0
Profile Copyright : Copyright (c) 1998 Hewlett-Packard Company
Profile Description : sRGB IEC61966-2.1
Media White Point : 0.95045 1 1.08905
Media Black Point : 0 0 0
Red Matrix Column : 0.43607 0.22249 0.01392
Green Matrix Column : 0.38515 0.71687 0.09708
Blue Matrix Column : 0.14307 0.06061 0.7141
Device Mfg Desc : IEC http://www.iec.ch
Device Model Desc : IEC 61966-2.1 Default RGB colour space - sRGB
Viewing Cond Desc : Reference Viewing Condition in IEC61966-2.1
Viewing Cond Illuminant : 19.6445 20.3718 16.8089
Viewing Cond Surround : 3.92889 4.07439 3.36179
Viewing Cond Illuminant Type : D50
Luminance : 76.03647 80 87.12462
Measurement Observer : CIE 1931
Measurement Backing : 0 0 0
Measurement Geometry : Unknown
Measurement Flare : 0.999%
Measurement Illuminant : D65
Technology : Cathode Ray Tube Display
Red Tone Reproduction Curve : (Binary data 2060 bytes, use -b option to extract)
Green Tone Reproduction Curve : (Binary data 2060 bytes, use -b option to extract)
Blue Tone Reproduction Curve : (Binary data 2060 bytes, use -b option to extract)
Image Width : 3840
Image Height : 2160
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Aperture : 2.0
Image Size : 3840x2160
Megapixels : 8.3
Shutter Speed : 1/2000
Create Date : 2015:09:14 12:50:38.190234
Date/Time Original : 2015:09:14 12:50:38.190234
Modify Date : 2015:09:14 12:50:38.190234
GPS Latitude : 31 deg 35' 2.76" N
GPS Longitude : 130 deg 32' 51.73" E
Date/Time Created : 2015:09:14 12:50:38
Digital Creation Date/Time : 2015:09:14 12:50:38
Focal Length : 4.6 mm
GPS Position : 31 deg 35' 2.76" N, 130 deg 32' 51.73" E
Light Value : 14.0
GPS Latitude : 31 deg 35' 2.76" N #緯度
GPS Longitude : 130 deg 32' 51.73" E #経度
これからGooglemapでこの地点を調べてみる。
これから、川の名前がわかる。
答えは、cpaw{koutsukigawa}
参考資料
exiftool ->https://qiita.com/Uma_adn/items/7ec3d4e3d5319004932f