$switch = @ARGV[0];
if ($switch eq "-d")
{
$plaintext = <STDIN>;
@text = split(/ /, $plaintext);
$length = @text;
$i = 0;
$w = 0;
while ($w <= $length) {
if ($i == 0) {
@text[$w] =~ tr/seklbvrfzijdqypcnowmtxuagh/a-z/;
$i++;
$w++;
next;
}
if ($i == 1) {
@text[$w] =~ tr/elbtjpwdvzqaorfiyxnukmghsc/a-z/;
$i++;
$w++;
next;
}
if ($i == 2) {
@text[$w] =~ tr/velukbiyxnordctjgpwhzqafms/a-z/;
$i++;
$w++;
next;
}
if ($i == 3) {
@text[$w] =~ tr/orsdvejwmcbiyhfzlukxntqgpa/a-z/;
$i++;
$w++;
next;
}
if ($i == 4) {
@text[$w] =~ tr/yxsdicvejqfbhmpluaorgkztwn/a-z/;
$i++;
$w++;
next;
}
if ($i == 5) {
@text[$w] =~ tr/ejqyxsdkziurgtwcaovfbhmpln/a-z/;
$i++;
$w++;
next;
}
if ($i == 6) {
@text[$w] =~ tr/jqyhcaxsdlkziuevfrgtwobmpn/a-z/;
$i++;
$w++;
next;
}
if ($i == 7) {
@text[$w] =~ tr/atdvnsirekmfqhwobjclgypxuz/a-z/;
$w++;
$i = 0;
next;
}
}
reverse @text;
$ciphertext = join (" ", @text);
print $ciphertext;
} else {
$plaintext = <STDIN>;
$plaintext =~ tr/A-Z/a-z/;
@text = split(/ /, $plaintext);
$length = @text;
$i = 0;
$w = 0;
while ($w <= $length) {
if ($i == 0) {
@text[$w] =~ tr/a-z/seklbvrfzijdqypcnowmtxuagh/;
$i++;
$w++;
next;
}
if ($i == 1) {
@text[$w] =~ tr/a-z/elbtjpwdvzqaorfiyxnukmghsc/;
$i++;
$w++;
next;
}
if ($i == 2) {
@text[$w] =~ tr/a-z/velukbiyxnordctjgpwhzqafms/;
$i++;
$w++;
next;
}
if ($i == 3) {
@text[$w] =~ tr/a-z/orsdvejwmcbiyhfzlukxntqgpa/;
$i++;
$w++;
next;
}
if ($i == 4) {
@text[$w] =~ tr/a-z/yxsdicvejqfbhmpluaorgkztwn/;
$i++;
$w++;
next;
}
if ($i == 5) {
@text[$w] =~ tr/a-z/ejqyxsdkziurgtwcaovfbhmpln/;
$i++;
$w++;
next;
}
if ($i == 6) {
@text[$w] =~ tr/a-z/jqyhcaxsdlkziuevfrgtwobmpn/;
$i++;
$w++;
next;
}
if ($i == 7) {
@text[$w] =~ tr/a-z/atdvnsirekmfqhwobjclgypxuz/;
$w++;
$i = 0;
next;
}
}
reverse @text;
$ciphertext = join (" ", @text);
print $ciphertext;
}
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