HP jetdirect 175x Administrator's Manual page 260

Certificates
Digital certificates are used to validate the identity of network
clients and servers and allow encrypted communications. A digital
certificate is an electronic message typically containing, among
other things, a key (a short string used for encryption and
decryption) and a digital signature. Certificates may be issued and
signed by a trusted third party (commonly called a Certificate
Authority, or CA), which may exist internal or external to the
organization. Or certificates may be "self-signed", which is similar
to validating your own identity.
To support EAP/PSK and selected EAP/802.1x authentication
methods, an HP Jetdirect print server may need to contain one or
both of the following certificates:
G CA Certificate. A certificate from a trusted Certificate
Authority (CA) is used to validate certificate information
received from an authentication server. The CA must be the
same as that used for the authentication server.
G
Jetdirect Certificate. A certificate that validates the Jetdirect
device to the authentication server must be installed. The
Jetdirect certificate may be issued by a trusted Certificate
Authority, or may be self-signed, depending on the
requirements established by the administrator of the
authentication server.
Encryption
HP Jetdirect 802.11b wireless print servers support both static and
dynamic encryption protocols.
Static WEP. The IEEE 802.11b standard includes a WEP (Wired
Equivalent Privacy) protocol for security. Using a secret key, a WEP
algorithm provides data encryption immediately before wireless
transmissions, and data decryption when received. While absolute
security cannot be guaranteed, WEP security is considered the first
significant line of defense against casual eavesdroppers.
For WEP security, the WEP protocols must be implemented on each
wireless device on your network. HP Jetdirect wireless print servers
support WEP protocols.
WEP security uses a secret key for authentication or data
encryption on both the sending and receiving device. If a secret WEP
key (analogous to a password value) is used for authentication, it
ENWW
HP Jetdirect 802.11b Wireless Print Servers 260