hashing

🚀 Crypto Basics Series #43: What Is Hashing?

🔢 What Is a Hash?

A hash is a fixed-length string of characters generated from input data using a mathematical function called a hash function.

Even a tiny change in the original data can produce a completely different hash.

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⚙️ How Does Hashing Work?

Data → Hash Function → Hash

For example:

"HELLO" → "A1B2C3..."

Change the data:

"HELLO!" → "F8D9E1..."

The resulting hash can be completely different.

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🔗 Why Is Hashing Important in Blockchain?

Hashing helps with:

- 📦 Linking blocks together
- 🔐 Protecting data integrity
- 🧾 Identifying blockchain data
- 🔍 Detecting changes
- 🛡️ Supporting blockchain security

Each blockchain can use different hashing algorithms and designs.

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💡 Simple Example

Think of a hash as a digital fingerprint for data.

If the original data changes, the fingerprint changes too.

That's why unexpected changes can be detected.

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⚠️ Important

A hash is not encryption.

Encryption is designed so authorized users can recover the original information.

Hashing is generally designed as a one-way transformation where recovering the original input from the hash should be computationally difficult for a secure hash function.

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💬 Question

What happens when the input data changes?

🅰️ The hash can change completely
🅱️ The hash always stays identical

👇 Comment your answer!

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📰 المصدر: blog.trailofbits.com