Secure Transmission Medias

In today's current technological industry, what tends to be the most secure transmission medias?  What are the least secure?  List all that apply for each.
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Well, that's a very vague question.

It all depends on the encryption technology and protocols being used.  Key size affects its sucess, but also the algorithm, 3DES, SHA-2, etc.  

The most secure transmissions are one's that have been encrypted. ie: SSH.  Least secure would be those not encrypted.  Ie: telnet

anne4mooreAuthor Commented:
Well I am just looking for your input and opinion based on your use, and expertise.  For example, would you continue to use dial-up, T-line tranmissions, DSL, telnet, wireless,  etc.   Why would you use one over the other?  Give specifics (i.e. dial-up security specs vs DSL security specs, etc)...
If your really concerned use good encryption between the two sides.

Wireless = no, unless your connecting to the gateway with encryption, with a method to valid the gateway.

The rest depend on the security, most DSL companies lock down traffic, so no traffic is seen by another client.  Cable companies not so much.

Dial up is pretty good.

Without taking other steps, if someone wants to get you, they still can.


Most secure is direct fiber. Fiber is very difficult to tap into or intercept any traffic. No emanations from the lines can be intercepted.

Least secure is wireless, for obvious reasons. 1's and 0's flowing through the air are very difficult to keep from being intercepted.

Other media includes:

T1 - T3 - depends on if it is direct connect to Internet, or if it is a point-to-point leased line. Leased line is pretty secure by itself becuase it really is a virtual direct copper connection from one end to the other, although some of it may be carried through fiber

ATM OC-x falls into the same category, although more fiber is typically used as connections/endpoints, making it a tad bit more secure than Tx copper lines.

Frame-relay uses statistical multiplexing to service multiple customers on a single access node, or single T1. Individual DLCI's are assigned to virtual circuits, but they are still 'virtual' and not physcical, but they are point-to-point between 2 sites. This makes them relatively secure, but not totally.

Latest round of MPLS "ip vpn" depends in varying degrees on the implementation. MPLS circuits, like frame-relay, use virtual connections but is more akin to VLAN tagging, and all traffic for the same customer (vlan) can be encrypted. This is more secure than frame-relay

Dial-up lines are pretty secure. You don't think twice about giving up personal information or credit card information over the phone, sending data is no less secure. Wiretaps are easy enough to put in, but very stringent laws have kept that at bay.

DSL is typically a direct Internet connection. As with Cable or any other direct internet connection, the Internet Service Provider has virtually no responsibility to protect you from anything on the Internet. You'd better protect yourself.

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