Black Box AC431A Specifications

Protect your network from unauthorized access.

Protect your network from unauthorized access.

Modem Data Security

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FEATURES

• Locks out unauthorized users.

• Issues an authentication process that
ensures user authorization before
starting a peer-to-peer or client/server
session.

• Uses real-time DES encryption.

• Encrypts your RS-232 data.

• Maintains dialup capability.

• Installs between the modem and host.

• Use in pairs.

• To program, simply plug two units
together.

OVERVIEW

Prevent unauthorized users from accessing your system
without your consent or from automatically recording
information about your computer settings. The Modem Data
Security eliminates unwelcome monitoring by manipulating
all handshakes and data exchanges with multiple algorithms
and encrypting them to keep any node-specific information
from being monitored and decoded.

What’s more, you can protect your computer, network, host,
or server without compromising simple dialup capabilities.
The Modem Data Security installs between the computer and
the modem to intercept and authenticate incoming call access
attempts before connecting to the protected device.

Simply program the Modem Data Security to establish
which nodes will be allowed access. To program, plug two units
together. A multilevel handshake occurs, and each data security
unit stores information about the other. The unit can authorize
secure connections without transmitting any compromising
information.

In a typical dialup application, you have one computer
and modem connected to the Modem Data Security at one
end of the link. At the other end of the link, you have a
second computer and modem connected to another Modem
Data Security unit.

Once the pair of Modem Data Security units establishes
an authorized communication session, each unit generates
a unique DES base-key and cipher vector and encrypts all
transmitted data in real time.

Supports full duplex serial communications.

Data is encrypted by one Modem Data Security unit and
decrypted by the other Modem Data Security unit at the
other end of the line. Either unit can encrypt and decrypt
data at the same time. The Modem Data Security units also
adapt automatically to the connected modem’s baud rate
from 300 to 38,400 bps. The Modem Data Security unit also
recognizes standard computer modem control commands,
then transfers them unencrypted. Plus, it monitors hardware
flow control (RTS and CTS) between DTE and DCE.

Computer

Modem

Modem

Computer

Modem Data

Security (AC431A)

Modem Data

Security (AC431A)

The Modem Data Security installs between

a computer’s serial port and a modem.

2/7/2007
#14584

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