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Training Camp • Cybersecurity Glossary
A file signature, or magic number, is a byte sequence identifying a file's true format regardless of its extension, used widely in digital forensics.
File Signature Definition: A file signature, or magic number, is a byte sequence identifying a file's true format regardless of its extension, used widely in digital forensics.
A file signature, also called a magic number or magic bytes, is a fixed sequence of bytes at a known offset, usually the start of a file, that identifies its format independent of the file extension. Forensic and security tools use these signatures to detect a file's true type, identify mismatched or disguised extensions, and carve files from raw disk images. For example, PNG files begin with the bytes 89 50 4E 47, and PDF files begin with the ASCII string %PDF.
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