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Data Integrity - How Hashing is used to ensure data isn't modified - HMAC - Cryptography
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Data Integrity - How Hashing is used to ensure data isn't modified - HMAC - Cryptography

Data Integrity and Hashing Algorithms

In this section, the concept of data integrity and how hashing algorithms contribute to ensuring data integrity are discussed.

Understanding Data Integrity and Hashing

  • Hashing algorithms like MD5 or SHA-1 are used to calculate digests from messages for data integrity.
  • Sending both the message and its digest ensures that the message was not altered in transit.
  • The vulnerability of this method lies in potential interception and modification of the message by an attacker.
  • Establishing a mutual secret key between sender and receiver is crucial for enhancing data integrity.

Message Authentication Code (MAC) for Data Integrity

  • Mutual secret keys are combined with messages to calculate digests, ensuring message authenticity.
  • MAC proves that messages were not tampered with during transmission and authenticates the sender's identity.
  • HMAC (Hash-based Message Authentication Code) specifies how keys are combined with messages for integrity verification.

Key Takeaways

  • Hashing algorithms produce message digests, while MAC involves combining messages with secret keys for authentication.

Lesson Conclusion

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Video description

Data Integrity seeks to assure that data has not been modified in transit between a sender and receiver. This assurance is provided using a Hashing Algorithm... but not simply by itself, that leaves you open to an attacker modifying your message and re-calculating the digest. Instead, something else must be done in addition to Hashing. In this video, we discuss that "something else". This will have us introduce the concept of a Message Authentication Code (MAC), and the most common implementation of a MAC known as the HMAC (Hash Based Message Authentication Code). This lesson is a free sample lesson from the the most effective TLS and SSL training course ever created. No instructor rambling on about pointless stories. No slides with massive walls of text. No time wasting. Only simple, effective, and precise explanations. Complimented with practical illustrations and visuals. 🔐 More details about the course: https://classes.pracnet.net/courses/practical-tls 🏢 Do you configure or troubleshoot TLS/SSL for work? If so, I'm willing to bet your employer would happily pay for this SSL training. Reach out if you'd like to coordinate an introduction for a bulk license purchase with your company. I'm happy to provide a generous referral bonus =) 💬 Join Practical Networking Discord https://discord.com/invite/yrexngJ 🖧 Want to learn how how data moves through a network? https://www.youtube.com/playlist?list=PLIFyRwBY_4bRLmKfP1KnZA6rZbRHtxmXi Since you've made it to the bottom of the Description, here's a $100 off coupon code you can use on the full course =) YT100