A new patent (number 20100138654) has appeared at the US Patent & Trademark Office for a system of digital rights management (DRM) that would identify the authenticity of a device based on the unique physical emission properties of a "particle gun." The invention invention relates to DRM and more specifically to authentication or hashing functions.
Here's Apple's background and summary of the invention: "The field of DRM involves code protection, code obfuscation and various other software security mechanisms. Cryptography is one such way to protect information. Cryptography is the practice of hiding information; encryption is the process of converting intelligible information (plaintext) into unintelligible information (ciphertext); and decryption is the process of converting ciphertext back into plaintext. Authentication is a software security mechanism that establishes or confirms an entity as authentic, or true.
"Hashing is also often utilized in...| Read more »