Method and system encodes a signal according to a code rate that includes a ratio of uncoded bits to coded bits. This slurry is used in a method of making water-resistant gypsum articles that includes making an emulsion of siloxane and water, then combining the slurry with a dry mixture of stucco, magnesium oxide and Class C fly ash. Then, when a specific thread locks an object, the identifier of the thread is stored in the lock field. The albedo function can serve as random key data in a variety of cryptographic applications.