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taub-IPsec - IP Security Lawrence Taub [email protected] IPSEC...

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IP Security Lawrence Taub [email protected]
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IPSEC IP security — security built into the IP layer Provides host-to-host (or router-to-router) encryption and authentication Required for IPv6, optional for IPv4 Comprised of two parts: IPSEC proper (authentication and encryption) IPSEC key management
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IPSEC Authentication header (AH) — integrity protection of header only Inserted into IP datagram Integrity check value (ICV) is 96-bit HMAC
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IPSEC Proper The AH authenticates entire datagram Mutable fields (time-to-live, IP checksums) are zeroed before AH is added Sequence numbers provide replay protection Receiver tracks packets within a 64-entry sliding window
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IPSEC Proper Encapsulating security protocol (ESP) — authentication (optional) and confidentiality Inserted into IP datagram Contains sequence numbers and optional ICV as for AH
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IPSEC Proper ESP secures data payload in datagram Encryption protects payload Authentication protects header and encryption Security Association bundling is possible ESP without authentication inside AH Authentication covers more fields this way than just ESP with authentication
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IPSEC Key Management Key management establishes a security association (SA) for a session SA used to provide authentication/confidentiality for that session SA is referenced via a security parameter index (SPI) in each IP datagram header
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