Weinong Wang weinong

## distributed-systems-readings.md

      
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                khenidak
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              November 22, 2020 16:55
            
          
    Foundation

Understanding ACID transactions
https://www.essentialsql.com/sql-acid-database-properties-explained/
Understanding CAP theorem
https://towardsdatascience.com/cap-theorem-and-distributed-database-management-systems-5c2be977950e

  
## yubikey4-ssh-macos.md

      
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                ixdy
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              September 25, 2025 06:45
            
              
                Setting up ssh public key authentication on macOS using a YubiKey 4
              
          
    Setting up ssh public key authentication on macOS using a YubiKey 4

I largely followed Florin's blog post, but have a few notes to add regarding issues I encountered:
Basic setup notes


I used a YubiKey 4, while the blog describes using a YubiKey NEO. I'm sure a YubiKey 5 would also work. I'm also running macOS 10.13.6.
I installed GPGTools as recommended. However, as I'll note later, it seems that gpg-agent only automatically starts when gpg is used; for ssh, you'll need to ensure it's running.
Before generating your keys, decide what key size you want to use. If you run the list command inside gpg --edit-card, look for the Key attributes line to see what is currently selected. On my YubiKey 4, it defaulted to 2048 bits for all keys:

Key attributes ...: rsa2048 rsa2048 rsa2048