How the password was found: Stratemeyer is the founder of the Nancy Drew series. 576 is from the syllables of the incorrect haiku on Tachyon's note.
There's a folder called: igel tsetop non tse mucearG
Backwards: Graecum est non potest legi
Latin for: It is Greek; it cannot be read
Inside the folder are three files:
4c4947415455524553
Hex for: LIGATURES
http://en.wikipedia.org/wiki/Ligature_%28typography%29
add .jpg and open it to get:
Top left: Omicron and Tau combined
Top right: Lambda or Phoenician Gimel [as pointed out by Tigerlilylynn] next to Sigma
Bottom Left: Theta on top of Mu [Watcher Symbol]
Bottom right: Theta on top of Pi
414d414c47414d4154494f4e
Hex for: AMALGAMATION
Dictionary.com definitions for amalgamate:
1. to mix or merge so as to make a combination; blend; unite; combine: to amalgamate two companies.
2. Metallurgy. to mix or alloy (a metal) with mercury.
add .jpg and open it to get:
Top Left: Theta
Bottom Left: Though the watcher symbol on the right would imply that it should be Mu, the flat top makes it appear more like Epsilon spun 90 degress [as pointed out by klgglk]
Bottom Left: Theta on top of Mu [Watcher Symbol]
53454d414e54494b4f53
Hex for: SEMANTIKOS
Note: Semantikos is semantics, not semiotics.
add .txt and open it to get:
Base64 -> textVGhlIFRoZXRhIGlzIHNpbWlsYXIgdG8gYW4gRWd5cHRpYW4gc3ltYm
9sIHRoYXQgcmVwcmVzZW50cyB0aGUgU3VuLCBhbmQgdGhlIE11IH
dhcyBkZXJpdmVkIGZyb20gdGhlIEVneXB0aWFuIGhpZXJvZ2x5cGhpY
yBzeW1ib2wgZm9yIHdhdGVyLiBTbyB0aGUgU3VuIGVxdWFscyBSYS4
uLmFuZCB0aGUgd2F0ZXIgZXF1YWxzIE5hdW5ldD8gT3IgbWF5YmUg
UG9zZWlkb24/IFdoZW4gY29tYmluZWQgdGhpcyAid2F0Y2hlciIgc3ltY
m9sIGVzdGFibGlzaGVzIHRoYXQgdGhlIE9yZGVyIHJ1bGVzIGFuZCB3Y
XRjaGVzIG92ZXIgYWxsIHRoYXQgZXhpc3RzIGluIGJldHdlZW4uDQoN
ClRoZXRhIGlzIHRoZSA4dGggbGV0dGVyLCBNdSBpcyB0aGUgMTJ0aC
4gU28gdGhhdCdzIG9uZSBtb3JlIDEyLCBidXQgdGhlIDggPSA/Lg0KDQ
pUaGV0YSB3YXMgYWxzbyB1c2VkIGFzIGFuIGFiYnJldmlhdGlvbiBmb3I
gIlRoYW5hdG9zLCIgYW5kIGNvbnNpZGVyZWQgYSB3YXJuaW5nIG9m
IGRlYXRoLg0K
Theta: http://en.wikipedia.org/wiki/ThetaThe Theta is similar to an Egyptian symbol that represents the Sun, and the Mu was derived from the Egyptian hieroglyphic symbol for water. So the Sun equals Ra...and the water equals Naunet? Or maybe Poseidon? When combined this "watcher" symbol establishes that the Order rules and watches over all that exists in between.
Theta is the 8th letter, Mu is the 12th. So that's one more 12, but the 8 = ?.
Theta was also used as an abbreviation for "Thanatos," and considered a warning of death.
Mu: http://en.wikipedia.org/wiki/Mu_%28letter%29
Ra: http://en.wikipedia.org/wiki/Ra
Naunet: http://en.wikipedia.org/wiki/Naunet
Poseidon: http://en.wikipedia.org/wiki/Poseidon
Thanatos: http://en.wikipedia.org/wiki/Thanatos
Greek Alphabet: http://en.wikipedia.org/wiki/Greek_alphabet