Which type of encryption, in general, would be considered the more secured encryption method across a single link?
A.
End-to-end encryption
B.
Tunnel encryption
C.
Transport encryption
D.
Link encryption
Explanation:
A link encryption will encrypt all data along a physical path between
two endpoints. The key point here is that it is a single link, and within a single
line, link encryption would provide higher security and performance for the
encryption services. All data transferred including headers, trailers, and address
and routing data would be encrypted.
Would not end-to-end encryption still be more secure than link encryption no matter how many links there are because it covers all levels of OSI? Also, the question does not ask about performance so why is performance a factor in the explanation?
0
0
end-to-end is actually NOT more secure. Per Harris:
Link encryption encrypts all the data along a specific communication path, as in a satellite link, T3 line, or telephone circuit. Not only is the user information encrypted, but the header, trailers, addresses, and routing data that are part of the packets are also encrypted. The only traffic not encrypted in this technology is the data link control messaging information, which includes instructions and parameters that the different link devices use to synchronize communication methods. Link encryption provides protection against packet sniffers and eavesdroppers.
In end-to-end encryption, the headers, addresses, routing, and trailer information are not encrypted, enabling attackers to learn more about a captured packet and where it is headed.
0
0
Ref: http://en.wikipedia.org/wiki/Link_encryption
1. Link encryption encrypts and decrypts all traffic at each end of a communications line (e.g. a teleprinter circuit).
2. End-to-End encryption where messages are encrypted by the sender at the point of origin and only decrypted by the intended receiver.
Now, who uses and when link encryption vs End-to-End encryption?
http://luizfirmino.blogspot.com/2011/05/end-to-end-encryption-vs-link.html
1. Link encryption is used by service providers and it provides encryption to header, trailers, addresses and routing data.
2. End-to-end encryption is used by users but only the data payload is encrypted.
Any comments?
0
0