My guess is this is "non-formula" in that there is a lookup instead of evaluating a function that uses the plaintext contents. Excessively simple example of Caesar cipher:

$plaintext = 'Attack at dawn!';
# formula - very simple encoding function
foreach $chr (split //,$plaintext) {
  $ciphertext .= chr(ord($chr)+1)
}
print $ciphertext,"\n";
$ciphertext = '';


# non-formula
# only need to do this next step once, then store hash somewhere to us
+e when encoding
foreach $letter ('A'..'Z','a'..'z',' ','!') {
  $shifted{$letter} = chr(ord($letter)+1)
}

foreach $chr(split //,$plaintext) {
  $ciphertext .= $shifted{$chr}
}
print $ciphertext, "\n";

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Dum Spiro Spero

In reply to Re^4: Non-Formula based Text Encoding - with Compression by GotToBTru
in thread Non-Formula based Text Encoding - with Compression by locked_user erichansen1836

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