Minecraft – I can’t find the resource and texture pack on minecraft

The default texture resolution is 16x16.

Until Minecraft version 1.5, a client mod was required for higher resolutions.

It is unadvised to have your login and password in the link. As far as I know and am concerned, The link is sent to the client and then downloaded from there. Through that, someone may look in the logs/console of the client and figure out the source of the download. Most may not notice but those that monitor traffic through a personal firewall may have that flagged out as suspicious and thus revealing that link.

It is advised to upload the texturepack elsewhere such is on dropbox or some other public hosting site where the user can download without compromising your server security.