Science Knowings: JavaScript Course For Social Media

Data Encryption

HTTPS and SSL/TLS - A Recap

In our previous session, we covered HTTPS and SSL/TLS protocols that play a crucial role in securing online communication. These protocols ensure that data transmitted between a web server and a browser remains encrypted and protected from eavesdropping.

Data Encryption - The Need

Startling Fact: In 2023, there were over 4 billion data breaches worldwide, exposing sensitive information.

Data encryption is a powerful tool to protect sensitive data from unauthorized access, ensuring confidentiality and integrity.

What is Data Encryption?

Data encryption involves converting plaintext (readable data) into ciphertext (unreadable data) using mathematical algorithms. This process makes it extremely difficult for unauthorized individuals to access and understand the encrypted data.

Types of Data Encryption

Symmetric Key Encryption

Uses the same key for both encryption and decryption. It's faster and more efficient but requires secure key exchange.

Asymmetric Key Encryption

Employs two different keys - a public key for encryption and a private key for decryption. It's slower but more secure for key exchange.

Symmetric Key Encryption Algorithms

  • AES (Advanced Encryption Standard): Widely used, strong encryption, block cipher with 128-bit key.
  • 3DES (Triple DES): Older but still secure, block cipher with three 56-bit keys.

Asymmetric Key Encryption Algorithms

  • RSA (Rivest-Shamir-Adleman): Widely used, public-key encryption with large key sizes (1024-4096 bits).
  • ECC (Elliptic Curve Cryptography): Newer, faster, and more secure than RSA for same key size.

How to Implement Data Encryption

Encryption Libraries

Numerous libraries available for various programming languages, such as:

  • Java: Java Cryptography Extension (JCE)
  • Python: PyCrypto, Cryptodome
  • JavaScript: Web Crypto API

Best Practices for Data Encryption

  • Use strong encryption algorithms: Choose algorithms like AES-256 or RSA-2048.
  • Manage keys securely: Protect encryption keys with strong key management practices.
  • Encrypt data at rest and in transit: Ensure data is protected in databases and during network transmission.
  • Regularly review and update encryption protocols: Stay up-to-date with evolving security threats.

Secure Password Storage (Hashing)

Why it Matters:

Storing passwords in plaintext is a major security risk. Hashing is a one-way encryption technique that securely stores passwords.

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