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@xirkus
xirkus / yubikey+gpupgp+ssh_howto.md
Last active August 13, 2025 00:22
Security Adventures 1. How to get yubikey+gpg+ssh+gitbhub working on MacOS

I've spent the day trying to get this setup working with GitHub and given the number of gotcha's I encountered, it seemed like a good idea to document how I finally got this working with as few hacks as possible. There's a lot of documentation out there (some of it old and misleading) and committing here for posterity will help me remember this when I inevitably need to do this again.

Rationale

Passwords are simply not enough these days. Regardless of the company, breaches (and the associated Personally Identifiable Information harvested) are a matter of not if, but when. There are a number of things you can do to protect yourself, but being on the tin-foil-hat side of paranoia, means there are a few Commandents that I adhere to (and recommend for other folks)[Insert link to Fight Club Rules for the Secure Internet].

That being said, if you use 2-factor authentication and have committed to using a hardware token such as the Yubikey, then you're already ahead of the curve. The problem is that wh

@widdowquinn
widdowquinn / kali_osx_persistence_wifi.md
Last active October 26, 2025 20:14
Kali Linux Live USB with persistence and wireless on Macbook Pro

Kali Linux Bootable USB with Persistence and Wireless on OSX

Download the appropriate Kali Linux .iso

I used a 64 bit .iso image, downloaded via HTTP. I downloaded the amd64 weekly version, as the pool linux headers (needed below for installation of wireless drivers) were ahead of the stable release kernel.

Download the SHA256SUMS and SHA256SUMS.gpg files from the same location.

@gboudreau
gboudreau / AuthyToOtherAuthenticator.md
Last active December 8, 2025 04:45 — forked from Ingramz/AuthyToOtherAuthenticator.md
Export TOTP tokens from Authy

Exporting your 2FA tokens from Authy to transfer them into another 2FA application

IMPORTANT - Update regarding deprecation of Authy desktop apps

Past August 2024, Authy stopped supported the desktop version of their apps:
See Authy is shutting down its desktop app | The 2FA app Authy will only be available on Android and iOS starting in August for details.

And indeed, after a while, Authy changed something in their backend which now prevents the old desktop app from logging in. If you are already logged in, then you are in luck, and you can follow the instructions below to export your tokens.

If you are not logged in anymore, but can find a backup of the necessary files, then restore those files, and re-install Authy 2.2.3 following the instructions below, and it should work as expected.

@vkroz
vkroz / Kafka commands.md
Last active January 21, 2024 12:12
Kafka frequent commands

Kafka frequent commands

Assuming that the following environment variables are set:

  • KAFKA_HOME where Kafka is installed on local machine (e.g. /opt/kafka)
  • ZK_HOSTS identifies running zookeeper ensemble, e.g. ZK_HOSTS=192.168.0.99:2181
  • KAFKA_BROKERS identifies running Kafka brokers, e.g. KAFKA_BROKERS=192.168.0.99:9092

Server

Start Zookepper and Kafka servers

@pkirkovsky
pkirkovsky / yubikey-reset.sh
Last active February 28, 2025 10:02
Utility for resetting a Yubikey to factory defaults using gpg-connect-agent. This will wipe out any stored keys and reset PINs to default values.
# Adapted from https://developers.yubico.com/ykneo-openpgp/ResetApplet.html
gpg-connect-agent <<EOF
/hex
scd serialno
scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40
scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40
scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40
scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40
scd apdu 00 20 00 83 08 40 40 40 40 40 40 40 40
scd apdu 00 20 00 83 08 40 40 40 40 40 40 40 40