Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2004-06-14
2009-10-13
Vu, Kimyen (Department: 2435)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S176000, C380S274000
Reexamination Certificate
active
07603554
ABSTRACT:
An encryption transmission apparatus and an encryption reception apparatus avoid attack that takes advantage of a re-transmission request. A server apparatus encrypts a content key five times, thereby generating five encrypted content keys, calculates a hash value of the content key, and transmits the five encrypted content keys and the hash value. An image playback apparatus receives the five encrypted content keys and the hash value, decrypts the five encrypted content keys thereby generating five content keys, calculates hash values, each corresponding to the generated content keys, and compares the calculated hash values with the received hash value, respectively. If at least one of the five calculated hash values matches the received hash value, the corresponding content key is considered correct. Conversely, if none of the five calculated hash values matches the received hash value, it is considered a decryption error.
REFERENCES:
patent: 4305152 (1981-12-01), Asakawa et al.
patent: 5365589 (1994-11-01), Gutowitz
patent: 6081597 (2000-06-01), Hoffstein et al.
patent: 2002/0116612 (2002-08-01), Yamamichi et al.
patent: 2003/0226007 (2003-12-01), Olson et al.
patent: 2002-252611 (2002-09-01), None
Jeffrey Hoffstein et al., “NTRU: A Ring-Based Public Key Cryptosystem”, Lecture Notes in Computer Science, 1423, pp. 267-288, Springer-Verlag, 1998.
John A. Proos, “Imperfect Decryption and an Attack on the NTRU Encryption Scheme”, Jan. 7, 2003, pp. 1-28.
Menezes, Vanstone, Oorschot: “Handbook of Applied Cryptography”, 1997, CRC Press LLC, USA, pp. 330, 364-365, 397-398, 506-507.
Futa Yuichi
Ohmori Motoji
Tatebayashi Makoto
Yamamichi Masato
Yamamichi, legal representative Keiko
King John B
Panasonic Corporation
Vu Kimyen
Wenderoth , Lind & Ponack, L.L.P.
LandOfFree
Encryption communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Encryption communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Encryption communication system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4072557