When searching file headers for JPEG formats in hex, which sequence indicates a JPEG header?

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Prepare for the Computer Hacking Forensic Investigator v11 exam. Study with flashcards and multiple choice questions. Each question includes hints and explanations. Get exam-ready efficiently!

Multiple Choice

When searching file headers for JPEG formats in hex, which sequence indicates a JPEG header?

Explanation:
JPEG files start with a Start of Image marker, followed by a marker for the application segment (usually APP0 for JFIF). The sequence begins with 0xFFD8 (SOI), then 0xFFE0 (APP0), then a two-byte length, commonly 0x0010, and the ASCII "JFIF". So the pattern FFD8 FF E0 00 10 matches this typical header, making it a reliable indicator of a JPEG header in hex data. The other sequences don’t form a valid JPEG header: a string of 0xFF bytes has no marker type; 0xFF 00 is not a marker sequence but a byte-stuffing pattern seen inside streams; 0xEF 00 EF 00 EF 00 isn’t a recognized JPEG marker pattern.

JPEG files start with a Start of Image marker, followed by a marker for the application segment (usually APP0 for JFIF). The sequence begins with 0xFFD8 (SOI), then 0xFFE0 (APP0), then a two-byte length, commonly 0x0010, and the ASCII "JFIF". So the pattern FFD8 FF E0 00 10 matches this typical header, making it a reliable indicator of a JPEG header in hex data.

The other sequences don’t form a valid JPEG header: a string of 0xFF bytes has no marker type; 0xFF 00 is not a marker sequence but a byte-stuffing pattern seen inside streams; 0xEF 00 EF 00 EF 00 isn’t a recognized JPEG marker pattern.

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