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AAA Registration Keys

AAA Registration Keys. Charles E. Perkins/Nokia Research Pat R. Calhoun/Sun Microsystems. Motivation and context. Using new AAA security model, mobile node has security only with AAAH Mobile IP needs security ass’n between mobile node and home agent

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AAA Registration Keys

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  1. AAA Registration Keys Charles E. Perkins/Nokia Research Pat R. Calhoun/Sun Microsystems

  2. Motivation and context • Using new AAA security model, mobile node has security only with AAAH • Mobile IP needs security ass’n between mobile node and home agent • 3G requirements document specify need for keys also with foreign agent • both with mobile node and with home agent

  3. More AAA details • Mobile node MAY use MN-NAI to identify itself • AAA is separate protocol from Mobile IP • Mobile IP extensions for AAA • AAA extensions for Mobile IP • Single Internet Traversal for initial registration

  4. Use of Generalized Key Distribution extensions • New Unsolicited MN-HA Key Reply subtype • New Unsolicited MN-FA Key Reply subtype • HA-FA could be handled within AAA without involvement from Mobile IP

  5. Well-known algorithms 3 & 4 • Mobile IP has a defined range (1-255) for SPIs that indicate well-known algorithms • e.g., RADIUS computation from Challenge draft • It is convenient and accepted today to use MD5 for encoding keys • AAA keys draft specifies two new MD5 well-known SPIs for simplicity • avoids SPI negotiation • SPI 3 for MD5 in prefix+suffix mode • SPI 4 for HMAC MD5 (RFC 2104)

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