Ok, here's my try at an explanation
# Assume the message is this
my $message = "me ss age";
# Use unpack to endcode the message one character at a time
my @character_code_send = unpack("C*", $message);
# You now have an array of ASCII values for each
# character of the message.
# If you want to send the encoded message you
# must join all the element of the array
# together first
# No need to use join because " " does it for you
my $secret = "@character_code_send";
# So what gets sent is this
print "Message encoded = $secret\n";
# To decode the receiver has to split back out to an array
my @character_code_received = split ' ',$secret;
# And then use pack to decode each element back to string
my $characters_received = pack("C*", @character_code_received);
# To get the answer !!
print "Message decoded = $characters_received";
I assume this is just a programming exercise and not a real attempt at encryption
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