Why is it that security mechanisms are still needed at layer


1: No one has formally "proven" that 3-DES or RSA are "secure". Given this, what evidence do we have that they are indeed secure? 500 words

2. If IPSec provides security at the network layer, why is it that security mechanisms are still needed at layers above IP? 500 words

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Basic Computer Science: Why is it that security mechanisms are still needed at layer
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