Abstract: The invention relates to rapid cryptography methods and devices for secure data access. A private key is temporarily created for a cryptography use on a computer for decrypting a document. A device comprising a second data matrix, which is external to the computer, is read by the computer, which processes the second data matrix using a first data matrix already present on the computer. Then, the first data matrix provides the means for stepping through the second data matrix to create a private key. Next, the private key is erased immediately after the private key is created and used in a cryptography process for accessing secure data. The first and second data matrices are hidden by the user, and the private key is not stored, but instead is temporarily re-created as needed only for rapidly accessing secure data.

Abstract: A method of determining the concentration of an analyte in a sample, said method comprising bringing said analyte in contact with an indicator zone comprising a concentration gradient of a mobile binding member; and bringing said mobile binding member gradient into operable contact with a test zone comprising a fixed binding member, wherein a detectable signal that indicates the concentration of said analyte is produced.

Abstract: A method of monitoring a therapeutic regimen in an animal, the method involving a) providing to the animal a therapeutic compound and a detectable compound that passes into the bloodstream, excretory system, or other tissue or body fluid in detectable form; b) after a period of time, following step (a), sufficient for passage of a detectable amount of the detectable compound into the body fluid or tissue, collecting a sample of the fluid or tissue from the animal; and c) measuring or detecting the detectable compound, or a detectable metabolite thereof, in the sample, wherein the detectable compound involves one member of a specific binding pair, and detection is carried out using the second member of the specific binding pair.

Abstract: In general, the invention features a method of marking a product for identification in which a marker, composed of a print molecule, print molecule analogue, or molecularly imprinted molecule, are added to the product and subsequently measured in a specific binding assay.

Abstract: Methods for determining the concentration of an analyte in a sample in which an analyte gradient is established and brought into contact with one or more zones that contain binding members that interact with the analyte and thereby produce a detectable signal. Devices that may be used to practice the disclosed methods are also provided.

Abstract: In general, the invention features a method of marking a product for identification in which a low molecular weight hapten is associated with the product as a marker, where the hapten is non-deleterious to the product, inert with respect to the product, and not already associated with the product.