Bluetooth® is a wireless technology used for exchanging voice and
data over short distances between Bluetooth enabled devices. Ericsson
introduced Bluetooth to the market in 1994 to overcome the challenges of
connecting devices with different types of technology and communication
protocols.

Since its introduction, the Bluetooth® Special Interest Group has collected
more than 20,000 member companies and the Bluetooth standard has
become a widespread and popular method of connecting devices.
More than 2 billion units are able to use Bluetooth technology, which
has consequentially raised concerns about security issues.

Before getting into details about Bluetooth security, it should be mentioned
that overall, the risk of unauthorized access to communication via
Bluetooth is limited. In general, Bluetooth offers a very high level of security,
which Sennheiser has chosen to enhance further through the intelligent
use of innovative solutions.

High Level of Security

As mentioned earlier, Bluetooth technology offers a high level of security
for the user. It is extremely difficult to eavesdrop or to interfere with Bluetooth
communication for many reasons, including the short range and the
authentication that must take place in order to use the devices.

In theory, the most vulnerable point for Bluetooth devices is when they are
pairing as they have to be visible/discoverable to do that. Even though the
security threat is highly hypothetical, Sennheiser has addressed the issue
with several intelligent measures.

Different types of threats:

In order to explain the advantages of the secure Sennheiser headsets it is
useful to list the different types of threats that are being discussed.

Man in the middle attack: An attacker tries to intercept information
over to his device without the knowledge of the attacked. It is extremely
difficult to do that in real life, as the attacker would have to be very close
to the devices.

Virus: Wireless transmission of a harmful virus. The Sennheiser Bluetooth
headset and the Bluetooth dongle only transmit speech, not data like other
Bluetooth devices. Therefore, there is no environment for a virus to run.

Eavesdropping: An attacker listening in on a conversation. The attacker
would have to be present at the pairing and furthermore have extremely
advanced equipment. The voices are encrypted and converted to a digital
stream.

Modern devices use the Bluetooth® 4.0 standard and higher, especially for
the use of voice transmission, which provides a high level of protection.

Supplementary Sennheiser Security

For Sennheiser, security for the user plays an important role in product
development. They have taken extra steps in order to strengthen the
high level of security that Bluetooth technology provides. Here are some
examples:

Intelligent Power Management: During pairing, the transmit power of
Sennheiser Bluetooth devices is reduced. This results in a much shorter
range when performing the pairing process. “Man in the Middle” attacks
become extremely difficult to undertake as the attacking device would
have to be very close to the pairing devices.

Host Device Access Security: Sennheiser headsets and the corresponding
USB-dongles only support audio related Bluetooth profiles. Data content
stored on the host device can never be transmitted to the headset or other
devices. This means that viruses cannot be transferred, either.

Short Pairing Window: Sennheiser headsets are only discoverable for a
very short period during pairing. After that short period, they automatically
turn off the Bluetooth access until access is reactivated by
the authorized user.

To see our wide range of Sennheiser headsets, click here.

Source: Sennheiser

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