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| A1: | True. Both the sender and receiver needed to know the same secret (the position of internal rotors) in order to communicate successfully and in secret. |
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| A2: | False. The trusted third party maintains our public keys. |
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| A3: | True. Diffie-Hellman is simply a means whereby individuals can agree on a shared, secret key over an insecure medium. |
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| A4: | False. IPSec SAs are uni-directional, and utilities such as telnet and ftp will have at least two SAs: one inbound and one outbound. |
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| A5: | False. By default, IPFilter has no rules defined, and hence all network services are enabled. |