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Manual for BL-521 5_3.doc © Copyright Brainboxes Limited 2004 Page 13 of 41
Security Mode
The factory set security mode is 3 (Highest). This field has 3 available settings from the drop down list:
1) Selecting option “1” will immediately place your converter into security mode 1. This is the lowest security mode
that the converter can be configured to. Connections, including service discovery, can take place without the need
for “pairing” or “bonding”. In mode 1, the converter automatically accepts all access requests without initiating
authentication, encryption, or authorization procedures. Any attempt by a remote application to perform
authentication or encryption procedures will be rejected.
2) Selecting option “2” will immediately place your converter into security mode 2. This mode allows remote
Bluetooth devices to search for and retrieve the services on your converter without pairing, but will not allow them to
connect unless the 2 devices are paired.
3) Selecting option “3” will immediately place your converter into security mode 3 (default). This is the highest
security mode available. Connections of any kind (other than a device discovery) from a remote Bluetooth device
are only allowed after a successful “pairing” has been performed. No services will be shown to other Bluetooth
devices unless the 2 devices are successfully paired.
The tables below show some more information with regards to the application of the security settings…
Security modes for converter as Client (initiates Connections):
Security:
Who can Pair? Who can it connect to? Possible use:
High
(Mode 3)
BL-521 will only pair with
device entered in the ‘Set
Partner’ menu. Other
device must have identical
PIN number
Only device entered in
the ‘Set Partner’ Menu,
after pairing.
Secure connection between the BL-521
and a preset device (Link level enforced
security – can see device but not services
unless paired)
Medium
(Mode 2)
BL-521 will only pair with
device entered in the ‘Set
Partner’ menu. Other
device must have correct
link key
Only device entered in
the ‘Set Partner’ Menu,
after pairing.
Secure connection between the BL-521
and a preset device (Service level security
– can see services but not connect unless
paired)
Low
(Mode 1)
N/A Only device entered in
the ‘Set Partner’ Menu.
When users who do not want to spend time
pairing and do not require a secure
connection
Security mode for converter as Server (receives connections):
Security:
Who can Pair? Who can Connect? Possible Use:
High
(Mode 3)
Any Device with
correct PIN.
Any device Secure connection between the BL-521 and a preset
device (Link level enforced security – can see device
but not services unless paired)
Medium
(Mode 2)
Any Device with
correct PIN.
Any device Secure connection between the BL-521 and a preset
device (Service level security – can see services but
not connect unless paired)
Low
(Mode 1)
N/A Any device When users who do not want to spend time pairing and
do not require a secure connection
Encryption
Encryption is a method of ensuring that the communications between 2 devices cannot be “bugged” or “listened” to
by any unauthorised source. This encryption is performed in lower layers of the protocol stack as defined by the
Bluetooth Specification.
The factory set Encryption mode is “Disabled”. This field has a drop down list from which the configuration can be
changed to enable “Point to Point” or “Point to Point & Broadcast”.