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Manual Key
With manual keys,
administrators at both ends of a tunnel configure all the security
parameters. This is a viable technique for small, static networks
where the distribution, maintenance, and tracking of keys are not
difficult. However, safely distributing manual-key configurations
across great distances poses security issues. Aside from passing the
keys face-to-face, you cannot be completely sure that the keys have
not been compromised while in transit. Also, whenever you want to
change the key, you are faced with the same security issues as when
you initially distributed it.
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