List of helpful shortcuts for faster coding
If you have any other helpful shortcuts, feel free to add in the comments of this gist :)
Roberto Alvarez SU27Flanker
JamesOBenson
/ Generating a secure SSH Key and commands
Last active
August 6, 2025 13:37
SSH Generation and commands.
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| ssh-keygen | |
| -t ed25519 - for greatest security (bits are a fixed size and -b flag will be ignored) | |
| -t rsa - for greatest portability (key needs to be greater than 4096 bits) | |
| -t ecdsa - faster than RSA or DSA (bits can only be 256, 284, or 521) | |
| -t dsa - DEEMED INSECURE - DSA limted to 1024 bit key as specified by FIPS 186-2, No longer allowed by default in OpenSSH 7.0+ | |
| -t rsa1 - DEEMED INSECURE - has weaknesses and shouldn't be used (used in protocol 1) | |
| -b 4096 bit size | |
| -a 500 rounds (should be no smaller than 64, result in slower passphrase verification and increased resistance to brute-force password cracking) | |
| -C "[email protected]" comment.. |
lokhman
/ ubuntu-hardening.md
Last active
October 24, 2025 16:14
List of things for hardening Ubuntu
The list of actions listed below was taken mostly from Book Of Zeus with minor modifications and did the job well for Ubuntu version, which was available at that moment (May 2016). This gist was created for internal use and was never meant to be discovered by the web, although Google managed to find and index this page, which was a great surprise for me. Please check the original source for the updated information (links are provided in most of the sections), and read the comments below: they provide more details about the usage experience.
http://bookofzeus.com/harden-ubuntu/initial-setup/system-updates/
Keeping the system updated is vital before starting anything on your system. This will prevent people to use known vulnerabilities to enter in your system.
