Cybersecurity - Emerging Security Topics
Consider a blockchain where each block contains a hash of the previous block. If an attacker changes data in an earlier block, what will happen?
Consider a blockchain where each block contains a hash of the previous block. If an attacker changes data in an earlier block, what will happen?
medium📝 Analysis Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand hash linkage in blockchain
Each block's hash depends on its data and the previous block's hash.Step 2: Effect of changing earlier block data
Changing data alters that block's hash, which no longer matches the next block's reference, breaking the chain.Final Answer:
The hash of that block changes, breaking the chain -> Option DQuick Check:
Data change breaks hash chain [OK]
Quick Trick: Changing data breaks hash links in blockchain [OK]
Common Mistakes:
MISTAKES- Assuming chain stays valid after data change
- Thinking only last block hash changes
- Believing blockchain auto-corrects data
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