Enterasys Networks XSR-1805, XSR-1850, XSR-3250 manual Copyright 2003 Enterasys Networks Page 18

IPSec session	56-bit DES, 168-bit	Established during	Stored in plaintext	Secure IPSec
keys	TDES, or	the Diffie-Hellman	in memory	traffic
	128/192/256-bit	key agreement
	AES keys; HMAC
	SHA-1 key
Load test HMAC	≥ 80-bit HMAC	External	Stored encrypted	Compute and verify
SHA-1 key	SHA-1 key		in NVRAM of the	the HMAC SHA-1
			real time clock	value for the
			chip	software load test
Passwords	≥ 6-character	External	If stored in	Crypto Officer
	password		configuration file,	authentication for
	(SNMPv3 requires		passwords are	accessing the
	at least 8		stored in plaintext	management
	characters)		in Flash; if stored	interfaces (CLI,
			in user.dat,	SNMPv3, and
			passwords are	Bootrom Moniot
			stored encrypted	Mode), RADIUS
			in Flash; Bootrom	authentication
			passwords are
			stored in plaintext
			in NVRAM of the
			real time clock
	Table 8 – Listing CSPs for the Module

Key Generation

The RSA key pair used during IKE, the DSA host key pair used during SSHv2, and the Diffie-Hellman key pairs used during IPSec and SSHv2 are all generated within the module. Additionally, each module gives the option to generate the 3-key Triple-DES master encryption key within the module. All keys that are generated within a module are generated using a FIPS-approved PRNG.

Key Establishment

The modules implement SSHv2 and IKE for automatic key establishment. These protocols implement the Diffie-Hellman key agreement to establish shared secrets.

Key Entry and Output

Three types of secret keys can be entered in plaintext form into the modules: the master encryption key, pre-shared keys, and the load test HMAC SHA-1 key. The master encryption key can either be specified or generated within the module. Pre-shared keys, if chosen as the authentication method for IKE, must always be entered into the module by the Crypto Officer. The HMAC SHA-1 key must be entered into the module before a valid software file is loaded into the module.

The three keys are entered electronically if the SSH or the Telnet over IPSec secured remote session is used or manually if the module is accessed locally through the console port. When these keys are manually entered, a manual key entry test is performed.

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