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End-to-end encryption and link

State the difference between end-to-end encryption and link?

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Link Encryption:

a) Applied by the sending host.
b) Transparent to the user.
c) Encryption facility is maintained by the host.
d) One facility for all the users.
e) Can be done in the hardware.
f) All or no messages are encrypted.
 
 End-to-end Encryption:

a) Applied by the sending process
b) Encryption applied by the user.
c) User must determine algorithm.
d) User selects the encryption scheme.
e) Software implementation.
f) User wishes to encrypt, or not, for each message

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