Cisco 2811 Series Operazioni - Pagina 14

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2.3.4 Strength of Authentication

The security policy stipulates that all user passwords must be 8 alphanumeric characters, so the

password space is 2.8 trillion possible passwords. The possibility of randomly guessing a

password is thus far less than one in one million. To exceed a one in 100,000 probability of a

successful random password guess in one minute, an attacker would have to be capable of 28

million password attempts per minute, which far exceeds the operational capabilities of the

module to support.

When using RSA based authentication, RSA key pair has modulus size of 1024 bit to 2048 bit,

thus providing between 80 bits and 112 bits of strength. Assuming the low end of that range, an

attacker would have a 1 in 2

chance of randomly obtaining the key, which is much stronger

than the one in a million chance required by FIPS 140-2. To exceed a one in 100,000 probability

of a successful random key guess in one minute, an attacker would have to be capable of

approximately 1.8x10

attempts per minute, which far exceeds the operational capabilities of the

modules to support.

When using preshared key based authentication, the security policy stipulates that all preshared

keys must be 8 alphanumeric characters, so the key space is 2.8 trillion possible combinations.

The possibility of randomly guessing this is thus far less than one in one million. To exceed a

one in 100,000 probability of a successful random guess in one minute, an attacker would have

to be capable of 28 million attempts per minute, which far exceeds the operational capabilities of

the module to support.

The router is entirely encased by a metal, opaque case. The rear of the unit contains

HWIC/WIC/VIC connectors, LAN connectors, a CF drive, power connector, console connector,

auxiliary connector, USB port, and fast Ethernet connectors. The front of the unit contains the

system status and activity LEDs. The top, side, and front portion of the chassis can be removed

to allow access to the motherboard, memory, AIM slot, and expansion slots.

The Cisco 2811 and 2821 routers require that a special opacity shield be installed over the side

air vents in order to operate in FIPS-approved mode. The shield decreases the surface area of the

vent holes, reducing visibility within the cryptographic boundary to FIPS-approved

specifications.

Install the opacity plates as specified in the pictures below:

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