Protocol for protecting content protection data
US8792636B2 · kind B2 · utility
1Cited by
3References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2010 |
| Grant date | Jul 29, 2014 |
| Priority date | — |
| Expiry date | Jul 4, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/80
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.