Brute force mistyped GPG passwords. script.js creates a list of possible passwords by scrambling a string by switching the positions of two neighboring characters, script.sh tries them.

script.js

// http://stackoverflow.com/a/1431113/782920
String.prototype.replaceAt=function(index, character) {
	return this.substr(0, index) + character + this.substr(index + character.length);
}
function scramble(text) {
	var result = text + '\n';
	for (var i = 0; i < text.length -1; i++) {
		var temp = text;
		temp = temp.replaceAt(i, text.charAt(i + 1));
		temp = temp.replaceAt(i + 1, text.charAt(i));
		result += temp + '\n';
	}
	console.log(result);
}
scramble('test');

script.sh

#!/bin/bash
#

for word in $(cat passwords.txt); do

	echo "${word}" | gpg --passphrase-fd 0 -q --batch --allow-multiple-messages --no-tty --output output.txt -d msg.asc;

	if [ $? -eq 0 ]; then

		echo "GPGP passphrase is: ${word}";
		exit 0;

	fi

done;

exit 1;