Methods, systems, and computer readable media can be operable to facilitate the encryption of a device identifier using an identification property of a SoC. A unique identifier of a cable modem may be encrypted using a unique key or other unique property of a SoC associated with the cable modem. When an authentication process is initiated at the cable modem, the encrypted unique identifier of the cable modem may be decrypted using the unique key or other unique property of the SoC, thereby producing the unique identifier of the cable modem. The decrypted unique identifier of the cable modem may be output from the cable modem to an upstream controller during the authentication process. In embodiments, an obfuscation key may be used to encrypt and decrypt the unique identifier of the cable modem, and the obfuscation key may be generated using a unique identifier of the SoC.