CryptoWithAhmar

Cryptography is a method of protecting information so only the right person can read it.

The easiest analogy:

It is like locking your message in a box with a unique key. Only the person who has the exact key can open it. In digital world, the key is math.

How Does Cryptography Work?

It uses mathematical formulas to turn readable information into something that looks like nonsense.

Think of 3 steps:

1. Encryption

Turning your message into secret code.
Example:
“Hello” → 5f9a12c0e2…

2. Transmission

You send the coded message over internet, WiFi, Bluetooth, doesn’t matter. Even if someone steals it, they only see nonsense.

3. Decryption

The receiver uses a key to unlock the code and read the real message. If you don’t have the key, even supercomputers can’t break it.

Why It is Important?

Because the internet is basically an open world. Anyone can intercept a message, but cryptography ensures your data safety.

What Problems Does It Solve?

1. Privacy (Keeping data secret)

Your messages remain private.

2. Integrity (No tampering)

Ensures data hasn’t been changed.

3. Authentication (Who are you?)

Verifies identity.

4. Non-repudiation

Non-repudiation ensures that a signed message or transaction can be verified as coming from the claimed sender.

5. Secure communication in hostile environments

Even during war or government communication.

• Who Invented Cryptography?

It has existed for thousands of years.

Earliest users:

Ancient Egyptians used secret symbols

Greeks used the "Scytale cipher"

Romans used Caesar Cipher (simple shifting letters)

But modern cryptography (strong math-based) was invented by:

Claude Shannon (1940s) — father of modern cryptography

Developed encryption theory during WW2.

Whitfield Diffie & Martin Hellman (1976)

Invented public-key cryptography, which is the foundation of Bitcoin, WhatsApp, HTTPS, everything.

Rivest–Shamir–Adleman (RSA, 1977)

Created the RSA encryption algorithm.

• Who Used Cryptography First in Modern History?

Military (WW1 & WW2)
For hiding battle plans.

Governments & Intelligence Agencies for secure communication.

Banks

Where Is It Used Today?

It is everywhere in modern life.
You use it every single day, even if you don’t notice.

1. BTC & Blockchain

Wallets

Private keys

Signatures

Mining

Hashing

Without cryptography: BTC doesn’t exist.

2. WhatsApp

End-to-end encryption.

3. Internet Browsing (HTTPS)

Every website uses TLS/SSL cryptography.

4. Banking Apps

Login security, Payment authorization, Fraud prevention

5. Mobile Networks

Encrypted signals.

6. Cloud Services

Files are encrypted.

7. Password Managers

8. Digital Signatures

Used in:

Government documents

Corporate agreements

Smart contracts

9. Cybersecurity Tools

Firewalls, VPNs, encrypted disks.

10. AI & Data Security

Encrypting models, datasets, and user information.

Conclusion:

Cryptography is the backbone of trust on the internet.
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