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OpenSSL Encryption Cheatsheet

N. P. O'Donnell, 2020

Encrypting a file with AES 256 CBC

openssl enc -aes-256-cbc -in <plaintext input file> -out <ciphertext output file>

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SSH Cheatsheet

N. P. O'Donnell, 2020

Specify a Key

To have SSH use a specific key:

ssh -i <path/to/key> <remote host>

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Jenkins Cheatsheet

N. P. O'Donnell, 2020-21

Run in Docker

Get the Jenkins docker image:

docker pull jenkins/jenkins

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-- Number Theory stuff
-- N. P. O'Donnell, 2020

module NumberTheory (congruent, factors, prime, extendedEuclideanAlgorithm, greatestCommonDivisor, lowestCommonMultiple, coPrime) where

-- Euclidean division of two integers
euclideanDivision :: Integer -> Integer -> Integer
euclideanDivision a b = toInteger (floor ((fromIntegral a) / (fromIntegral b)))

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#!/usr/bin/env python3
#
# Crypto & Number Theory
# N. P. O'Donnell, 2020


def odd(a):
    """
    Is a odd?
    """

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Git Cheatsheet

N. P. O'Donnell, 2020

Remotes

List all commits on all remotes:

for c in $(git rev-list --remotes); do git show $c | head -n8; done | less

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#!/usr/bin/env python3
# Elliptic Curve functions
# For educational purposes only.
#
# N. P. O'Donnell, 2020-2021

from math import inf
import random

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#!/usr/bin/env python3
# Simple worker which can run a function in a different thread, and
# catch exceptions so they can be handled in the calling thread.
#
# N. P. O'Donnell, 2020

from threading import Thread
from typing import Callable
import random
import time

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Groovy Crash Course

N. P. O'Donnell, 2021

Groovy and Java

Groovy runs in the JVM. All valid Java is valid Groovy.

Hello World

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GPG Cheatsheet

N. P. O'Donnell, 2021

Key Management

List Secret Keys:

gpg --list-secret-keys