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To: Kenneth E. Phillipps who wrote (6788)	4/6/2000 4:48:00 PM
From: DenverTechie	Respond to of 12823

Encryption is currently provided on AT&T's cable telephony service. Since cable modem service has traditionally been perceived as a way to surf the Web primarily by residential users, there was no need for internal encryption on the bearer path. Any secure transactions taking place would use the site's security software such as SSL. This assumption is changing, prompting the need for encryption on the channels themselves. But AT&T cable telephone service has had encryption on their voice channels now for over a year, so implementation to cable modems should not be difficult, since it is a known implementation procedure from the voice side of the house.

To: Kenneth E. Phillipps who wrote (6788)	4/6/2000 10:12:00 PM
From: ftth	Respond to of 12823

Hi Ken, to DT's reply I would only add that the author of that article may be a bit confused. The encryption utilized on the link between the CM and the CMTS isn't related to the encryption in an implementation of a VPN between a user and some remote site. The cable plant encryption only exists within the cable plant, to secure local valued content. An encrypted link you establish as a cable modem user with an outside site is encrypted at higher layers. Anyone that's used a SecureID, remote access software, and a generic dialup modem knows that the secure link doesn't rely on the modem itself providing encryption. I gave more details on the DOCSIS encryption back in this post: Message 9540288 Things have changed a bit since then, but the basic flavor is still the same.