G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 21/24 (2006.01) H04W 88/02 (2009.01)
Patent
CA 2713787
Through the use of a one-time-use nonce, the transfer of cryptographic data over a potentially insecure link in a two-factor content protection system is avoided. The nonce may be stored encrypted with a public key from a smart card. A random key may be used to produce a storage key, which is used to encrypt a content protection key. The random key may be stored, encrypted with a key derived from the nonce. Instead of receiving a raw content protection key over the potentially insecure link, the raw nonce is received and, once used, replaced with a new nonce.
Little Herbert Anthony
Takacs Kristof
Tu Van Quy
Research In Motion Limited
Ridout & Maybee Llp
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