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Lesson 5: Hashing Present

Teaching and Learning

Created on March 17, 2026

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Transcript

Hashing Present

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Practical Networking. (2024, July 15). Hashing and Hashing Algorithms - md5 sha1 sha256 sha2 sha3 - Cryptography Essentials [Video]. YouTube. http://www.youtube.com/watch?v=QZY3IjFBtFY

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The Importance of Hashing

  • Data Integrity:
    • Hashing is crucial for verifying data integrity. By generating a hash value for data, users can detect any alterations.
    • Common applications include checksums for file downloads and data backups.
  • Password Storage:
    • Hashing is used to securely store passwords. Instead of saving plaintext passwords, systems store their hash values.
    • Even if the database is compromised, attackers cannot easily retrieve original passwords.

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Current Hashing Algorithms SHA2

SHA-2 (Secure Hash Algorithm 2):

  • Introduced: 2001; consists of multiple hash functions (e.g., SHA-224, SHA-256, SHA-384, SHA-512).
Characteristics:
  • Offers improved security over SHA-1.
  • Produces longer hash values, making collision attacks more difficult.
  • Usage: Widely adopted in SSL/TLS certificates, code signing, and data integrity checks.

The Code Bit. (2025, December 23). Securing data one block at a time – SHA 256 algorithm explained [Video]. YouTube. https://www.youtube.com/watch?v=T3cceblN1mE

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Current Hashing Algorithms SHA3

SHA-3 (Secure Hash Algorithm 3):

  • Introduced: 2015; based on the Keccak family of algorithms.
Characteristics:
  • Provides a different construction compared to SHA-2, enhancing security and performance.
  • Supports variable-length outputs, making it flexible for various applications.
  • Usage: Suitable for applications requiring high security and resilience against future attacks.

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Current Hashing Algorithms

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Applications of Hashing

Data Structures
Blockchain Technology
File Integrity Checking

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Hashing in Security

Digital Signatures
Message Authentication Codes (MAC)
Data Deduplication
File Encryption

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Modern Hashing – Knowledge Check

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Message Authentication Codes (MAC)

Combines a hash function with a secret key to verify both the message's integrity and its authenticity. Commonly used in secure communications protocols like TLS.

The 3xplainer. (2025, November 10). Message authentication codes (MACs) explained — HMAC, CBC-MAC & GMAC simplified [Video]. YouTube. https://www.youtube.com/watch?v=BsT_mFjxpuw

Digital Signatures

Hashing is used to create a unique fingerprint of the data being signed. Ensures both authenticity (who signed it) and integrity (data hasn't changed).

ByteQuest. (2024, June 3). Digital signatures visually explained #cryptography #cybersecurity [Video]. YouTube. https://www.youtube.com/watch?v=cisWTAA_Y0w