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1. (WO1997018654) APPARATUS AND METHOD FOR ENCRYPTING MPEG PACKETS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/018654 International Application No.: PCT/US1996/018230
Publication Date: 22.05.1997 International Filing Date: 14.11.1996
Chapter 2 Demand Filed: 13.06.1997
IPC:
G09C 1/00 (2006.01) ,H04L 9/06 (2006.01) ,H04L 9/14 (2006.01) ,H04N 7/167 (2011.01)
G PHYSICS
09
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
C
CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
1
Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9
Arrangements for secret or secure communication
06
the encryption apparatus using shift registers or memories for blockwise coding, e.g. D.E.S. systems
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9
Arrangements for secret or secure communication
14
using a plurality of keys or algorithms
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
7
Television systems
16
Analogue secrecy systems; Analogue subscription systems
167
Systems rendering the television signal unintelligible and subsequently intelligible
Applicants:
SCIENTIFIC-ATLANTA, INC. [US/US]; One Technology Parkway South Norcross, GA 30092, US
Inventors:
PINDER, Howard, George; US
PALGON, Michael, Steven; US
Agent:
POTENZA, Joseph, M. ; Banner & Witcoff, Ltd. 11th floor 1001 G Street, N.W. Washington, DC 20001-4597, US
Priority Data:
08/710,84223.09.1996US
60/006,79115.11.1995US
Title (EN) APPARATUS AND METHOD FOR ENCRYPTING MPEG PACKETS
(FR) APPAREIL ET PROCEDE DE CRYPTAGE DE PAQUETS MPEG
Abstract:
(EN) A method of encrypting clear payload data to form encrypted payload data uses a block cipher, the block cipher being characterized by a predetermined block length. The method includes a step of parsing (7) and first and second steps of encrypting (8). The step of parsing parses (7) the clear payload data into at least one full clear block. Each full clear block is characterized by the predetermined block length. The residual block is characterized by a residual block length, the residual block length being less than the predetermined block length. The step of parsing further parses (7) the last full clear block into a first part and a second part, the second part being characterized by a length equaling a difference between the predetermined block length and the residual block length.
(FR) La présente invention concerne un procédé de cryptage de données de charge utile en clair, visant à former des données cryptées de charge utile. Ce procédé utilise un chiffre de bloc qui est caractérisé par une longueur de bloc prédéterminée. Le procédé comprend une étape d'analyse (7) et une première et une deuxième étapes de cryptage (8). L'étape d'analyse donne (7), à partir des données de charge utile en clair, au moins un bloc complet en clair. Chaque bloc complet en clair est caractérisé par la longueur de bloc prédéterminée. Le bloc résiduel est caractérisé par une longueur de bloc résiduelle qui est inférieure à la longueur de bloc prédéterminée. L'étape d'analyse décompose en outre (7) le dernier bloc en clair complet en une première et une deuxième parties, la deuxième étant caractérisée par une longueur égalant la différence entre la longueur de bloc déterminée et la longueur de bloc résiduelle.
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, HU, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TM, TR, TT, UA, UG, UZ, VN
African Regional Intellectual Property Organization (ARIPO) (KE, LS, MW, SD, SZ, UG)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0861540JP2000502219 CA2234982KR1019990067590AU1997011194