Amazon Interview Question


Country: United States




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Typically how antivirus searches malware or virus on the machine is by searching for its signature. These signatures are stored in the form of a pattern that antivirus searches across all files.
This use case will also fall in the same category where the required service will search for a malware pattern across photos and videos to see if they encode any malicious information.

For simplicity purposes, we will assume that photo and video will be converted from their binary stream format to base64 encoding. Base64 encoding of a photo/video will give us ASCII(text) representation of their contents.

We will keep the signature patterns of all the known malware in the map <Signature, malware name>. We can have multiple signatures for the same malware.

This problem will then translate to a substring search using a pattern. We can use Rabin-Karp or KMP algorithm to search for all the signature substrings across a stream of base64 encoded data that we scan/comes our way.

- Saurabh December 16, 2019 | Flag Reply


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