Nos bajamos el archivo b4.jpg y esta vez vemos los metadatos con algún programa para ello, como exiftool que nos muestra lo siguiente
ExifTool Version Number : 9.46 File Name : b4.jpg Directory : . File Size : 90 kB File Modification Date/Time : 2016:12:09 17:12:35+01:00 File Access Date/Time : 2016:12:04 19:21:41+01:00 File Inode Change Date/Time : 2016:12:09 17:12:35+01:00 File Permissions : rw-rw-r-- File Type : JPEG MIME Type : image/jpeg JFIF Version : 1.01 Exif Byte Order : Big-endian (Motorola, MM) Orientation : Horizontal (normal) X Resolution : 96 Y Resolution : 96 Resolution Unit : inches Software : Microsoft Windows Photo Viewer 6.1.7600.16385 Modify Date : 2010:04:28 13:28:38 Artist : james Y Cb Cr Positioning : Co-sited Exposure Time : 1/750 F Number : 8.4 Exposure Program : Program AE ISO : 100 Exif Version : 0220 Date/Time Original : 2010:04:28 19:28:59 Create Date : 2010:04:28 19:28:59 Components Configuration : Y, Cb, Cr, - Compressed Bits Per Pixel : 1.979816021 Shutter Speed Value : 1/792 Aperture Value : 8.4 Exposure Compensation : 0 Max Aperture Value : 3.2 Metering Mode : Multi-segment Light Source : Unknown Flash : Auto, Did not fire Focal Length : 6.3 mm Maker Note Version : STMN100 Preview Image Start : 1063457536 Preview Image Length : 3778281728 Warning : [minor] Bad format (1792) for MakerNotes entry 0 User Comment : I like chocolate Flashpix Version : 0100 Color Space : sRGB Exif Image Width : 1944 Exif Image Height : 2592 Related Sound File : RelatedSound Interoperability Index : R98 - DCF basic file (sRGB) Interoperability Version : 0100 Exposure Index : 1 Sensing Method : One-chip color area File Source : Digital Camera Scene Type : Directly photographed Exposure Mode : Auto White Balance : Auto Digital Zoom Ratio : 0 Focal Length In 35mm Format : 35 mm Scene Capture Type : Standard Contrast : Normal Saturation : Normal Sharpness : Normal Offset Schema : 4194 Padding : (Binary data 2060 bytes, use -b option to extract) Compression : JPEG (old-style) Thumbnail Offset : 23352 Thumbnail Length : 3392 XMP Toolkit : XMP Core 4.1.1-Exiv2 Creator Tool : Microsoft Windows Photo Viewer 6.1.7600.16385 Instance ID : uuid:faf5bdd5-ba3d-11da-ad31-d33d75182f1b Image Width : 364 Image Height : 486 Encoding Process : Baseline DCT, Huffman coding Bits Per Sample : 8 Color Components : 3 Y Cb Cr Sub Sampling : YCbCr4:4:0 (1 2) Aperture : 8.4 Image Size : 364x486 Preview Image : (Binary data 3778281728 bytes, use -b option to extract) Scale Factor To 35 mm Equivalent: 5.6 Shutter Speed : 1/750 Thumbnail Image : (Binary data 3392 bytes, use -b option to extract) Circle Of Confusion : 0.005 mm Field Of View : 54.4 deg Focal Length : 6.3 mm (35 mm equivalent: 35.0 mm) Hyperfocal Distance : 0.87 m Light Value : 15.7
Ahí tiene el user (artista) y el pass (comentario), pero en el pass no es tal cual ;).