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+% java keytool, certificate, encryption
+
+## Creating
+# Generate a Java keystore and key pair
+keytool -genkey -alias <ALIAS> -keyalg RSA -keystore <OUTPUT_JKS> -keysize <RSA_LENGTH>
+
+# Generate a certificate signing request (CSR) for an existing Java keystore
+keytool -certreq -alias <ALIAS> -keystore <INPUT_JKS> -file <OUTPUT_CSR>
+
+# Import a root or intermediate CA certificate to an existing Java keystore
+keytool -import -trustcacerts -alias root -file <INPUT_CRT> -keystore <INPUT_JKS>
+
+# Import a signed primary certificate to an existing Java keystore
+keytool -import -trustcacerts -alias <ALIAS> -file <INPUT_CRT> -keystore <INPUT_JKS>
+
+# Generate a keystore and self-signed certificate
+keytool -genkey -keyalg RSA -alias <ALIAS> -keystore <OUTPUT_JKS> -storepass <PASSWORD> -validity <VALIDITY> -keysize <RSA_LENGTH>
+
+
+
+## Verifying
+# Check a stand-alone certificate
+keytool -printcert -v -file <INPUT_CRT>
+
+# Check which certificates are in a Java keystore
+keytool -list -v -keystore <INPUT_JKS>
+
+# Check a particular keystore entry using an alias
+keytool -list -v -keystore <INPUT_JKS> -alias <ALIAS>
+
+
+
+## Other
+# Remove a certificate from a keystore
+keytool -delete -alias <ALIAS> -keystore <INPUT_JKS>
+
+# Change the password of a keystore
+keytool -storepasswd -keystore <INPUT_JKS> -new <NEW_PASSWORD>
+
+# Export a certificate from a keystore
+keytool -export -alias <ALIAS> -file <OUTPUT_CRT> -keystore <INPUT_JKS>
+
+# List the trusted CA Certs from the default Java Trusted Certs Keystore
+keytool -list -v -keystore $JAVA_HOME/jre/lib/security/cacerts
+
+# Import New Certificate Authority into the default Java Trusted Certs Keystore
+keytool -import -trustcacerts -file <INPUT_PEM> -alias <ALIAS> -keystore $JAVA_HOME/jre/lib/security/cacerts
+
+
+
+# Sensible/common default alternatives
+$ VALIDITY: printf "DAYS\tCOMMENT\n1\ta day\n30\ta month\n365\ta year\n730\ttwo years" --- --column 1 --headers 1
+$ RSA_LENGTH: printf "KEY LENGTH\tCOMMENT\n2048\t\tDefault\n4096\t\tBetter\n8192\t\tSlow?" --- --column 1 --headers 1
+
+# Attempt to find files with the appropriate endings, default to everything.
+$ INPUT_CRT:    ls -a | grep -e "\(.crt\|.cer\|.der\)" || ls -a
+$ INPUT_PEM:    ls -a | grep -e "\(.pem\)"             || ls -a
+$ INPUT_JKS:    ls -a | grep -e "\(.jks\)"             || ls -a