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AES GCM (Advanced Encryption Standard in Galois Counter Mode) - Computerphile

AES GCM (Advanced Encryption Standard in Galois Counter Mode) - Computerphile

Source: YouTube · Computerphile · published Apr 2, 2024 · 18:04

Cybersecurity
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Description

This video explains GCM (Galois Counter Mode), a crucial encryption mode used widely in online security 0:15. GCM combines encryption with authentication to protect data transmitted over the internet.

Key Takeaways:
• GCM is currently the most prevalent form of authentication used online 0:15
• When you watch online videos, they're likely encrypted using AES-GCM 0:28
• GCM builds upon counter mode, which uses AES to encrypt streams of data 0:40
• The video explains what's wrong with basic counter mode and how GCM improves upon it 0:45

Understanding GCM is essential as it forms the backbone of modern secure internet communications.

Sources:

  • 0:00 Introduction to modes of operation for block ciphers
  • 0:15 GCM as the most prevalent authentication online
  • 0:28 GCM likely encrypting the current video
  • 0:37 What GCM is and why it's useful
  • 0:40 Counter mode explanation
  • 0:45 Problems with counter mode and GCM improvements

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Estimated credit: 0.5 CPE hours

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Topic: Cybersecurity. Commonly maps to: Security and Risk Management, Security Operations. Exact CISSP domains are assigned during generation.

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First 800 characters of the transcript

we looked quite a while ago now a younger version of myself looked at modes of operation which is how we combine a block Cipher like AES into a workable encryption scheme that we can use let's say for internet traffic and actually the most prevalent form of authentication online now is as GCM which is as in galwa counter mode now we mentioned galwa counter mode very briefly in passing but I thought given how important it is and how much we use it like you know if you're looking at a video now a likelihood is it's encrypted using asgc maybe it's worth asking you know what is that right and why is it useful let's look very briefly back at counter mode which is how we use AES to encrypt a stream and then we can show what's wrong with it and what galar counter mode adds to that you've got a bl…