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Password-based authentication is used widely by operating systems as well as databases However, the use of passwords has some drawbacks, especially over a network If an eavesdropper is able to sniff the data being sent over the network, she may be able to nd the password as it is being sent across the network Once the eavesdropper has a user name and password, she can connect to the database, pretending to be the legitimate user A more secure scheme involves a challenge-response system The database system sends a challenge string to the user The user encrypts the challenge string using a secret password as encryption key, and then returns the result The database system can verify the authenticity of the user by decrypting the string with the same secret password, and checking the result with the original challenge string This scheme ensures that no passwords travel across the network Public-key systems can be used for encryption in challenge response systems The database system encrypts a challenge string using the user s public key and sends it to the user The user decrypts the string using her private key, and returns the result to the database system The database system then checks the response This scheme has the added bene t of not storing the secret password in the database, where it could potentially be seen by system administrators Another interesting application of public-key encryption is in digital signatures to verify authenticity of data; digital signatures play the electronic role of physical signatures on documents The private key is used to sign data, and the signed data can be made public Anyone can verify them by the public key, but no one could have generated the signed data without having the private key Thus, we can authenticate the data; that is, we can verify that the data were indeed created by the person who claims to have created them Furthermore, digital signatures also serve to ensure nonrepudiation That is, in case the person who created the data later claims she did not create it (the electronic equivalent of claiming not to have signed the check), we can prove that that person must have created the data (unless her private key was leaked to others).

To enable the SNMP service on the appliance, execute the snmp-server enable command The snmp-server host command specifies the SNMP network management station (NMS) that is allowed to access the appliance you can restrict the access to sending traps (trap) to the NMS or to getting information from the appliance (poll) The community string must match that configured on the NMS; if you omit this, the community string specified in the snmp-server community command is used If you omit the SNMP version, it defaults to 1; and if you omit the UDP port, it defaults to 162, which is used by SNMP traps The snmp-server contact and location commands specify information about the person responsible for the appliance and where the appliance is located these commands are optional To enable the appliance to forward traps to the SNMP NMS, use the snmp-server enable traps command If you don t qualify the command, all traps are forwarded (the all parameter) Optionally you can qualify which traps are forwarded to the NMS Table 26-2 lists the different types of traps you can specify for the related command parameter If you specify syslog in the command, use the logging history severity_level command to control what log messages are forwarded to the NMS, along with the logging enable command

68 Summary

Integrity constraints ensure that changes made to the database by authorized users do not result in a loss of data consistency In earlier chapters, we considered several forms of constraints, including key declarations and the declaration of the form of a relationship (many to many, many to one, one to one) In this chapter, we considered several additional forms of constraints, and discussed mechanisms for ensuring the maintenance of these constraints Domain constraints specify the set of possible values that may be associated with an attribute Such constraints may also prohibit the use of null values for particular attributes

authentication, linkup, linkdown, coldstart config-change, fru-insert, fru-remove start, stop session-threshold-exceeded

The McGraw Hill Companies, 2001

This section of the chapter will focus on upgrading the images on the appliance (both the operating system and ASDM), updating the license key to add additional features, and controlling the bootup process of the appliance

Summary

The third participation rate is calculated as follows: $163,125 $750,000 $116,250 $562,000 100 25%