312-49 · Question #187
When searching through file headers for picture file formats, what should be searched to find a JPEG file in hexadecimal format?
The correct answer is A. FF D8 FF E0 00 10. Every file format has a unique magic number (file signature) in its header that identifies the file type, regardless of its extension. The JPEG file format begins with the hex bytes FF D8 FF, which is its universally recognized magic number. The full signature FF D8 FF E0 00 10…
Question
When searching through file headers for picture file formats, what should be searched to find a JPEG file in hexadecimal format?
Options
- AFF D8 FF E0 00 10
- BFF FF FF FF FF FF
- CFF 00 FF 00 FF 00
- DEF 00 EF 00 EF 00
How the community answered
(43 responses)- A91% (39)
- B5% (2)
- C2% (1)
- D2% (1)
Explanation
Every file format has a unique magic number (file signature) in its header that identifies the file type, regardless of its extension. The JPEG file format begins with the hex bytes FF D8 FF, which is its universally recognized magic number. The full signature FF D8 FF E0 00 10 corresponds specifically to the JFIF variant of JPEG. Digital forensics tools and hex editors use these signatures to identify file types even when extensions have been changed or removed. The other hex sequences listed do not correspond to any standard image file format signature.
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