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30. Introduction to Cryptographic Hashing

Hashing converts input data into a fixed-size fingerprint, ideal for integrity checks.

Example​

import hashlib

data = "secure message".encode("utf-8")
digest = hashlib.sha256(data).hexdigest()
print("SHA-256 hash:", digest)

✅ Lesson: Use secure hash algorithms like SHA-256 or SHA-512 for data integrity.