This to learn/review
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Mandatory Access Control (MAC) vs Discrtionary Access Control (DAC)
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RADIUS / Diameter / TACACS
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TPM, HSM http://blogs.getcertifiedgetahead.com/tpm-hsm-hardware-encryption-devices/
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Signing vs Encrypting?
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Packet Headers
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SSL? Relationship to CA?
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Are CAs used for encryption? Or just verification?