Cryptography – Communication system using cryptography – Data stream/substitution enciphering
Reexamination Certificate
2007-02-27
2007-02-27
Moise, Emmanuel L. (Department: 2137)
Cryptography
Communication system using cryptography
Data stream/substitution enciphering
C726S026000, C380S277000
Reexamination Certificate
active
10222093
ABSTRACT:
Secure communication from one encryption domain to another using a trusted module. In one embodiment, the invention includes receiving encrypted streamed content encrypted with a first key, generating a substitution key stream based on the first key and a second key, generating a transposition key stream based on the first and second keys, and simultaneously decrypting and re-encrypting the encrypted streamed content using a combination of the substitution and transposition streams to produce re-encrypted streamed content encrypted with the second key.
REFERENCES:
patent: 6286103 (2001-09-01), Maillard et al.
patent: 6687822 (2004-02-01), Jakobsson
C. E. Shannon, “Communication Theory of Secrecy Systems”, 1949, pp. 665-669 and 713.
IEEE, “The Authoritative Dictionary of IEEE Standards Terms”, Dec. 2000, pp. 403.
Schneier, Bruce, “Applied Cryptography”, 1996, Second Edition, pp. 397-398.
Net on the go, “What is a Set Top Box?”, Feb. 2, 2001, pp. 1, obtained from http://web.archive.org/web/20010202030600/http:/
etonthego.org/.
Moise Emmanuel L.
Popham Jeffrey D.
Skabrat Steven P.
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