| Protection of digital content using block cipher crytography -> Monitor Keywords |
|
|
  Protection of digital content using block cipher crytographyUSPTO Application #: 20060159266Title: Protection of digital content using block cipher crytography Abstract: Protection of digital content using a specific application of block cipher cryptography is described. The digital content is encrypted using an encryption key and a calculated initialization vector. The digital content includes a plurality of strides of data and each stride includes a string of data to be encrypted and a block of data to be encrypted. The calculated initialization vector to be used to encrypt the block of data is derived from the string of data in the stride to be encrypted. Furthermore, the initialization vector is calculated by performing an exclusive disjunction function on a seed value and the string of data for each stride. (end of abstract) Agent: Blakely Sokoloff Taylor & Zafman - Los Angeles, CA, US Inventors: Pierre Chavanne, John Hwa, Lakshmana Pamarthy, Carl Quinn, Ralph Hill, Eric Swenson, Motomasa Futagami, Atsushi Mituszawa USPTO Applicaton #: 20060159266 - Class: 380262000 (USPTO) Related Patent Categories: Cryptography, Communication System Using Cryptography, Symmetric Key Cryptography, Symmetric Key Synchronization, Transmitting A Seed, Sequence, Or Initial Value The Patent Description & Claims data below is from USPTO Patent Application 20060159266. Brief Patent Description - Full Patent Description - Patent Application Claims
RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 60/462,987, filed Apr. 14, 2003. TECHNICAL FIELD [0002] This invention relates generally to the protection of digital content using cryptology, and more particularly to the protection of digital content using cipher block chaining. COPYWRIGHT NOTICE/PERMISSION [0003] A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever. The following notice applies to the software and data as described below and in the drawings hereto: Copyright .COPYRGT. 2003, Sony Electronics, Inc., All Rights Reserved. BACKGROUND [0004] Digital Rights Management is a term used to describe the concept of protecting copyrighted material via encryption and governing its access via rules, typically distributed independently of the content. The protected content is usually inaccessible without a legitimately acquired license (embodying the rules governing the access) and software that securely interprets and releases the content if the appropriate license is available. This technology is promoted widely to music labels and other music/content distribution companies to use as a core technology for protecting their content. [0005] Certain content encryption problems arise especially in the context of streamable media (e.g. media such as music or video that may be streamed across a network and rendered (e.g., played) while being streamed rather than after the entire content is received or when read from a local file). In these cases, encryption may need to be done in real time, and lossy transport protocols may cause situations where not all the content sent is ever received at the client. For example, lost blocks of encrypted data may cause the entire file to be unreadable. Furthermore, certain encryption techniques may increase the size of the digital content file. SUMMARY OF THE INVENTION [0006] Protection of digital content using a specific application of block cipher cryptography is described. The digital content is encrypted using an encryption key and a calculated initialization vector. The digital content includes a plurality of strides of data and each stride includes a string of data to be encrypted and a block of data to be encrypted. The calculated initialization vector to be used to encrypt the block of data is derived from the string of data in the stride to be encrypted. Furthermore, the initialization vector is calculated by performing an exclusive disjunction function on a seed value and the string of data for each stride. BRIEF DESCRIPTION OF THE DRAWINGS [0007] FIG. 1 is a diagram illustrating a system-level overview of an embodiment of the invention. [0008] FIG. 2 illustrates one embodiment of a process flow for exchanging digital content within the network environment of FIG. 1. [0009] FIG. 3A illustrates one embodiment of a digital content having multiple access units. [0010] FIG. 3B illustrates one embodiment of the access unit of digital content having multiple strides. [0011] FIG. 3C illustrates one embodiment of a calculated IV value being derived from the access unit. [0012] FIG. 3D illustrates one embodiment of a process flow for deriving the calculated IV value in conjunction with FIG. 3C. [0013] FIG. 3E illustrates one embodiment of a conceptual view for encrypting the access unit. [0014] FIG. 3F illustrates one embodiment of a process flow for encrypting the access unit in FIG. 3E. [0015] FIG. 4 illustrates one embodiment of a process flow of the digital rights management software to encrypt the copyrighted raw digital content. [0016] FIG. 5 illustrates one embodiment of a process flow for encrypting a partial stride. [0017] FIG. 6 illustrates one embodiment of a process flow of the client decryption software to decrypt the encrypted digital content on a client device. [0018] FIG. 7 illustrates one embodiment of a process flow for decrypting a partial stride. Continue reading... Full patent description for Protection of digital content using block cipher crytography Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Protection of digital content using block cipher crytography patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Protection of digital content using block cipher crytography or other areas of interest. ### Previous Patent Application: Communications system and method for transmitting voice and/or data Next Patent Application: Device, method, and program for random number generation, encryption, and decryption recording medium Industry Class: Cryptography ### FreshPatents.com Support Thank you for viewing the Protection of digital content using block cipher crytography patent info. IP-related news and info Results in 1.73847 seconds Other interesting Feshpatents.com categories: Medical: Surgery , Surgery(2) , Surgery(3) , Drug , Drug(2) , Prosthesis , Dentistry |
||
