System Design Fundamentals

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Uses of Checksum

Here are the top uses of checksum:

  1. Data Integrity Checks: Imagine sending a super-secret spy message - you wanna make sure it doesn’t get altered during transmission, right? Checksums ensure data hasn’t been tampered with during transmission by checking - you guessed it - the Checksum! If it doesn’t match, something’s fishy.

  2. Error Detection: Ever download a file and it just won’t open? Checksums can help detect if a bit of data got scrambled during a download, helping systems know when they need to try downloading it again.

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Chris Fitzpatrick

Chris Fitzpatrick

· 10 months ago

You would store the cryptographic hash and a salt of the password, not the "checksum". There have been quite a few blatantly incorrect assertions and misleading claims in the course material so far but this one is a bit egregious as it's a fundamental aspect of security. You're teaching system design to paying students - this isn't a topic you can afford to fudge the details on. Come on

陳彥志

陳彥志

· 2 years ago

Checksums alone cannot prevent intentional tampering because a malicious actor can intercept the data, modify it, and recalculate the checksum using the same algorithm, making the tampered data appear valid.

Please correct me if I was wrong

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S

Suraj Gupta Gudla

· 4 months ago

This section seems to be contradicting, What if the data is modified, checksum is re-calculated and even the checksum is updated along with the data, It would indicate no data corruption/alteration.