Solution by Ruben Westerberg

ch-1.pl and ch-1.p6
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Run the script to generate the first 10 strong and 10 weak prime numbers

ch-2.pl and ch-2.p6
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Encode and decode with Vigenère cipher. Ascii leters (upper and lower case), space, and sample pucctuation characters are supported.
Operation  is performed on a line by line basis from standard input and printed to standard output

To encode:
	ch-2.pl KEY
		where KEY is the key to encode with. Input data is read from stdin
To decode:
	ch-2.pl -d KEY
		where KEY is the key used for encoding. Input data is read from stdin

Loopback test:
	./ch-2.pl "my key" | ./ch-2.pl -d "my key"