What is encryption? Explain symmetric vs. asymmetric encryption.
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Encryption is the process of converting readable data (plaintext) into an unreadable format (ciphertext) to protect it from unauthorized access. Only someone with the correct key can decrypt the data back to its original form.
🔐 Types of Encryption:
1. Symmetric Encryption:
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Same key is used for both encryption and decryption.
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The sender and receiver must both have access to the shared secret key.
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Faster and more efficient for encrypting large amounts of data.
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Main challenge: Securely sharing the key between parties.
Example Algorithms: AES, DES, Blowfish
Use Case: Encrypting files or databases where both sender and receiver already trust each other.
2. Asymmetric Encryption (Public-Key Encryption):
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Uses a pair of keys: a public key (shared with everyone) and a private key (kept secret).
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Data encrypted with the public key can only be decrypted with the private key, and vice versa.
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More secure for communication between untrusted parties, but slower than symmetric encryption.
Example Algorithms: RSA, ECC
Use Case: Secure email, SSL/TLS (HTTPS), digital signatures.
In practice, both are often used together—asymmetric encryption to securely share a symmetric key, which is then used to encrypt data.
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