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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).

68 Summary

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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

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VisitDate 1/13/2007 1/13/2007 1/20/2007 1/18/2007 PatNo P1 P1 P3 P2 PatAge 35 35 17 60 PatCity DENVER DENVER ENGLEWOOD BOULDER PatZip 80217 80217 80113 85932 ProvNo D1 D2 D2 D3 ProvSpecialty INTERNIST N U R S E PRACTITIONER N U R S E PRACTITIONER CARDIOLOGIST Diagnosis E A R INFECTION INFLUENZA PREGNANCY MURMUR

The McGraw Hill Companies, 2001

copy Copy configuration or image data debug Debugging functions (see also 'undebug') disable Turn off privileged commands disconnect Disconnect an existing network connection enable memory Turn on privileged commands exit Exit from the EXEC help Description of the interactive help system lock Lock the terminal login Log in as a particular user logout Exit from the EXEC name-connection Name an existing network connection no Disable debugging functions ping Send echo messages reload Halt and perform a cold restart resume Resume an active network connection rsh Execute a remote command send Send a message to other tty lines setup Run the SETUP command facility show Show running system information systat Display information about terminal lines telnet Open a telnet connection terminal Set terminal line parameters test Test subsystems, memory, and interfaces traceroute Trace route to destination tunnel Open a tunnel connection undebug Disable debugging functions (see also 'debug') where List active connections write Write running configuration to memory, network, or terminal To determine the next required parameters and arguments for any of these commands, type one of the commands followed by a Type in one of these parameters followed by another Continue to do this until you see the <CR> option This means you have entered all the parameters, and by pressing Enter you will activate the command In the following example, the command is used to set the clock on the network device: vsigate#clock read-calendar Read the hardware calendar into the clock set Set the time and date update-calendar Update the hardware calendar from the clock vsigate#clock set hh:mm:ss Current Time vsigate#clock set 15:40:10 <1-31> Day of the month MONTH Month of the year vsigate#clock set 15:40:10 Apr <1-31> Day of the month vsigate#clock set 15:40:10 Apr 23 <1993-2035> Year vsigate#clock set 15:40:10 Apr 23 1999 You can also enter the command directly after a partial command, to determine all commands that start with that character sequence For example:.

Summary

PatZip -> PatCity , - , n ProvNo - ProvSpecialty VisitNo -> PatNo, VisitDate, PatAge, PatCity, PatZip VisitNo, ProvNo -> Diagnosis

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