Cryptography – Key management – Having particular key generator
Reexamination Certificate
2003-12-02
2008-12-30
Moazzami, Nasser G (Department: 2136)
Cryptography
Key management
Having particular key generator
C380S028000, C380S030000, C380S286000
Reexamination Certificate
active
07471792
ABSTRACT:
Provided is a content distribution system that prevents different keys to be derived between an encryption apparatus and a decryption apparatus. A random-number generating unit112d, in an encryption apparatus110d, generates a random number s, and a first function unit113dgenerates a functional value G(s) of the random number s, and generates a verification value a and a shared key K from the functional value G(s). An encryption unit114dgenerates a first cipher text c1of the verification value a using a public-key polynomial h, and a second function unit115dgenerates a functional value H(a,c1) of the verification value a and the first cipher text c1, and a random-number mask unit116dgenerates a second cipher text c2=s xor H(a,c1). A decryption unit123d, in a decryption apparatus120d, decrypts the first cipher text c1using a secret-key polynomial f, to generate a decryption verification value a′. A third function unit 124dgenerates a functional value H(a′,c1) of the decryption verification value a′ and the first cipher text c1, and a random-number mask removal unit125dgenerates a decryption random number s′=c2xor H(a′,c1). A fourth function unit126dgenerates a hash functional value G(s′) of the decryption random number s′, and generates a verification value a″ and a shared key K′ from the functional value G(s′) A comparison unit127doutputs the shared key K′ if the decryption verification value a′ is equal to the verification value a″.
REFERENCES:
patent: 5907618 (1999-05-01), Gennaro et al.
patent: 5937066 (1999-08-01), Gennaro et al.
patent: 5953420 (1999-09-01), Matyas et al.
patent: 2002/0116612 (2002-08-01), Yamamichi et al.
patent: 2003/0120929 (2003-06-01), Hoffstein et al.
patent: 2000-516733 (2000-12-01), None
patent: 2001-222218 (2001-08-01), None
patent: 2002-252611 (2002-09-01), None
patent: 98/08323 (1998-02-01), None
patent: WO 9808323 (1998-02-01), None
Victor Shoup, “A Proposal for an ISO standard for public key encryption (version 2.1)”, Dec. 20, 2001.
Howgrave-Graham, N. et al., “The Impact of Decryption Failures on the Security of NTRU Encryption,”International Association for Cryptologic Research, (2003), vol. 2729, pp. 226-246.
Whyte, W. ed., “Efficient Embedded Security Standards,”Consortium for Efficient Embedded Security, (2003), Draft Ver. 2, p. 1-78.
Lieman, D., et al., eds., “Standard Specification for Public-Key Cryptographic Techniques Based on Hard Problems Over Lattices,”Institute of Electrical and Electronics Engineers, Inc., (2001) Draft Ver. 2, p. 1-38.
Menezes, A., et al.,Handbook of Applied Cryptology, (1997), ch. 12, p. 506-508, ch. 13, p. 551-552, and ch. 9, p. 359-362.
Futa Yuichi
Ohmori Motoji
Tatebayashi Makoto
Yamamichi, legal representative Keiko
Yamamichi, legal representative Masami
Louie Oscar A
Moazzami Nasser G
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
LandOfFree
Key agreement system, shared-key generation apparatus, and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Key agreement system, shared-key generation apparatus, and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Key agreement system, shared-key generation apparatus, and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4048624