1) " Comcast" -- As it applies to Comcast Descrambler Comcast Corporation, ( NASDAQ : CMCSA ( http: quotes.nasdaq.com/asp/SummaryQuote.asp?symbol=CMCSA&selected=CMCSA ) ) based in Philadelphia, Pennsylvania is the largest cable company in the United States. They develop broadband cable networks and are involved inelectronic retailing and television programming content. Comcast was founded in 1963 by Ralph J. Roberts, Daniel Aaron, and Julian A. Brodsky. The companywas incorporated in Pennsylvania in 1969, under the name Comcast Corporation from American Cable Systems. Moving into the area of programming content, Comcast became majority owner of Comcast-Spectacor, Comcast SportsNet (in Chicago,Philadelphia, and Washington / Baltimore metro), E! Entertainment Television and Style Network, G4, The Golf Channel and the Outdoor Life Network over a period of years. The UK division was sold to NTL in 1998. After thesale of their cellular division to SBC Communications of SanAntonio and the acquisition of Greater Philadelphia Cablevision in 1999, Comcast andMediaOne announced a $60 billion merger which did not occur until three years later. In 2001, Comcast announced they would acquire the assets of AT&T Broadband (AT&T's cable TV service). In 2002 Comcastacquired all assets of AT&T Broadband thus making Comcast the largest cable television company in the United States. The company employs 68,000 people. In 2002, Comcast paid the University of Maryland anundisclosed amount for naming rights to the new basketball arena built on the campus, named Comcast Center. Contents 1 Stock 2 Management 3 Acquisitions 4 External links Stock The company has traded on the NASDAQ since 1972 and are currently offered under the ticker symbols CMCSA ( http: quotes.nasdaq.com/asp/SummaryQuote.asp?symbol=CMCSA&selected=CMCSA ) and CMCSK ( http: quotes.nasda...
2) " Descrambler" -- As it applies to Comcast Descrambler In telecommunications, a scrambler is a device thattransposes or inverts signals or otherwise encodes a message at the transmitter tomake the message unintelligible at a receiver not equipped with an appropriately set descrambling device. The first voice scramblers were invented at Bell Labs in theperiod just before WWII. One of those, used for (among many others) phone conversations between Winston Churchill and FranklinRoosevelt was intercepted and 'unscrambled' by the Germans. At least one German engineer had worked at Bell Labs before theWar. Later versions were sufficiently different that the German team was unable to unscramble them.One notion, actually put into (secret) production use, was to add noise at the sending end, and subtract the same noise at thereceiving end. The 'noise' was provided on large shellac phonograph records which made in pairs, shipped around as needed, anddestroyed after use. This worked, but was enormously awkward. Synchronization alone was a trial. This suggested to James Ellis the idea for non-secret encryption which ultimately led to the invention of both the RSA encryption algorithm and Diffie-Hellman key exchange well before either was reinvented publicly by Rivest, Shamir, and Adleman or by Diffie and Hellman. Note: The first scramblers, and many commercial ones as late as the end of the 20th century, used a simple algorithm (or scrambling mechanism). These do not provide much security against adetermined knowledgeable attacker, and provide communications privacy that is inadequate for classified traffic. More recent designs are much better, and some are approved by the US Government for secure traffic. Mostof these digitize the analog signals (ie, the voice at either end) and encrypt the digital data stream, reversing the process atthe destination. These can be as secure as the underlying cryptography andthe security of the distribution mechanism for the keys neede...
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