VERY RARE -- OEM Dallas Semiconductor Java-powered iButton CRYPTO"The Java-powered Cryptographic iButton provides hardware cryptographic services such as a high-speed math accelerator for 1024-bit public key cryptography, and secure message digest (hashing). In FIPS 140-1 terminology, the Crypto iButton is a “multi-chip standalone cryptographic module”; however, the Java iButton actually provides all its services using a single silicon chip packaged in a16mm stainless steel case."Untested and sold as-is.