Documentation, demos and examples from Jonathan Cross.

Diceware Entropy Improvement - Add entropy to offline passphrase generation -- don't trust your dice!
Homebrew and OpenPGP signatures - Information about how the MacOs brew command verifies packages.
Using an ssh tunnel to connect to a full node - Connect to a remote Monero or Bitcoin node through a secure tunnel.
Bitcoin mobile privacy - Improve your mobile client privacy & security via Tor and a Bitcoin full node.
Java strong crypto test - Test if you have strong crypto support for Java enabled.
Git Cheat Sheet - Notes on how to configure and use Git / GitHub.
Mac OSX Notes - General notes on useful configuration options for Mac OSX.
Software Hashes - A collection of SHA-256 software hashes.

BIP39_Seed_Phrase_Checksum.py - Calculate the final word (checksum) of a 24 word BIP39 seed phrase. Useful in combination with diceware.
upgrade-monero.sh - Script used to upgrade installed version of the Monero daemon.
apple-mail.pl - Send email from command line via Mail.app.

Secure PGP keys and Yubikey NEO - Notes on GPG and YubiKey NEO setup.
gpg.conf - Example "hardened" configuration file for GnuPG with secure defaults.
gnupg.md - Everything you ever wanted to know about gpg. Source for https://gpg.wtf
gpg-keys-signed-by.pl - Search for PGP keys in your local keychain signed by a given key.
send-pgp-keys.sh - Upload your GPG public key to multiple services after a change. Supports keybase, public keyservers and / or your own web server.
search-pgp-wot - Check all signatures on a given PGP key looking for any in the Web Of Trust.
email-key-uids.sh - Split a signed OpenPGP key into component UIDs and email them to the owner via Apple's Mail.app.
OpenBSD release key PGP signature - How to verify the OpenBSD 6.4 release signing key using OpenPGP web of trust.
OpenBSD verification - Verify OpenBSD install files from Linux or Mac.