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Notice that all the commands begin with dhcpd The address parameter specifies an address pool that should be used for clients connected to the specified logical interface The domain parameter assigns the domain name to the clients The dns parameter allows you to specify up to two DNS server addresses that should be assigned to the requesting clients, and the wins parameter allows you to specify up to two WINS server addresses The default lease length of an assigned address is 3,600 seconds if not configured: you can override this with the lease parameter Two pings are sent to an address to verify that it is not being used before it is assigned to a requesting client; the timeout for the echo replies can be changed with the ping_timeout parameter (the default is 50 milliseconds) The option parameter assigns different types of IP addressing information to the requesting client For example, the option 3 parameter assigns a default gateway address, whereas options 66 and 150 are used to assign a TFTP server address for IP phones and similar devices The auto_config parameter allows the appliance to acquire some of its addressing information from an interface where the appliance is a DHCP client and then to use this information for another interface where it is a DHCP server, like the learned domain name and DNS server addresses Optionally you can override this behavior and have the client use the addressing information assigned to it when the appliance is acting as a VPN remote/client (from the Easy VPN server), versus using the DHCP client information on the logical interface (the physical interface the appliance is connected toward the ISP where the appliance is a DHCP client) Last, the enable parameter enables the DHCP server for the specified interface

and again in 1993 However, weakness in DES was recongnized in 1993 as reaching a point where a new standard to be called the Advanced Encryption Standard (AES), needed to be selected In 2000, the Rijndael algorithm (named for the inventors V Rijmen and J Daemen), was selected to be the AES The Rijndael algorithm was chosen for its signi cantly stronger level of security and its relative ease of implementation on current computer systems as well as such devices as smart cards Like the DES standard, the Rijndael algorithm is a shared-key (or, symmetric key) algorithm in which the authorized users share a key Public-key encryption is an alternative scheme that avoids some of the problems that we face with the DES It is based on two keys; a public key and a private key Each user Ui has a public key Ei and a private key Di All public keys are published: They can be seen by anyone Each private key is known to only the one user to whom the key belongs If user U1 wants to store encrypted data, U1 encrypts them using public key E1 Decryption requires the private key D1 Because the encryption key for each user is public, it is possible to exchange information securely by this scheme If user U1 wants to share data with U2 , U1 encrypts the data using E2 , the public key of U2 Since only user U2 knows how to decrypt the data, information is transferred securely For public-key encryption to work, there must be a scheme for encryption that can be made public without making it easy for people to gure out the scheme for decryption In other words, it must be hard to deduce the private key, given the public key Such a scheme does exist and is based on these conditions: There is an ef cient algorithm for testing whether or not a number is prime No ef cient algorithm is known for nding the prime factors of a number For purposes of this scheme, data are treated as a collection of integers We create a public key by computing the product of two large prime numbers: P1 and P2 The private key consists of the pair (P1 , P2 ) The decryption algorithm cannot be used successfully if only the product P1 P2 is known; it needs the individual values P1 and P2 Since all that is published is the product P1 P2 , an unauthorized user would need to be able to factor P1 P2 to steal data By choosing P1 and P2 to be suf ciently large (over 100 digits), we can make the cost of factoring P1 P2 prohibitively high (on the order of years of computation time, on even the fastest computers) The details of public-key encryption and the mathematical justi cation of this technique s properties are referenced in the bibliographic notes Although public-key encryption by this scheme is secure, it is also computationally expensive A hybrid scheme used for secure communication is as follows: DES keys are exchanged via a public-key encryption scheme, and DES encryption is used on the data transmitted subsequently.