HP 5120 SI Series Security Configuration Manual page 76

Figure 25 802.1X authentication procedure in EAP termination mode
In EAP termination mode, it is the network access device rather than the authentication server generates
an MD5 challenge for password encryption (see Step 4). The network access device then sends the MD5
challenge together with the username and encrypted password in a standard RADIUS packet to the
RADIUS server.
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