Signature-Based Detection
TL;DR
Signature-based detection matches known patterns but fails against novel threats. Polymorphic malware changes signatures every 10-30 minutes; Netflix was the polymorphic competitor Blockbuster's playbook couldn't match.
Speed Read
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300 WPM
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Scanning files for known virus code patterns and blocking matches. Works well against simple viruses but rendered obsolete by polymorphic malware that changes code with each infection.
Business Application of Signature-Based Detection
Kaspersky's early defense strategy that worked against simple viruses spreading via floppy disks. The limitation - requiring known patterns - mirrors how businesses relying on recognizing past competitive moves fail against novel strategies.