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The foregoing authentication methods are very Microsoftish, but there are standard protocols used to perform authentication as well The standard authentication protocols used by various network services, such as RAS and VPN, for authentication include the following

(continued)

Password authentication protocol (PAP): The password authentication protocol sends the user s credentials in plain text and is very insecure because of how easy it is for someone to analyze and interpret the logon traf c This is the authentication protocol used by the basic authentication method mentioned previously Challenge handshake authentication protocol (CHAP): With challenge handshake authentication protocol the server sends a client a challenge (a key), which is combined with the user s password Both the user s password and the challenge are run through the MD5 hashing algorithm (a formula), which generates a hash value, or mathematical answer, and that hash value is sent to the server for authentication The server uses the same key to create a hash value with the password stored on the server and then compares the resulting value with the hash value sent by the client If the two hash values are the same, the client has supplied the correct password The bene t is that the user s credentials have not been passed on the wire at all Microsoft challenge handshake authentication protocol (MS-CHAP): MS-CHAP is a variation of the CHAP authentication protocol and uses MD4 as the hashing algorithm versus MD5 used by CHAP MS-CHAP also uses the Microsoft Point-to-Point Encryption (MPPE) protocol along with MS-CHAP to encrypt all traf c from the client to the server MS-CHAPv2: With MS-CHAP version 2 the authentication method has been extended to authenticate both the client and the server MS-CHAPv2 also uses stronger encryption keys than CHAP and MS-CHAP

Listing 12-7

Extensible authentication protocol (EAP): The extensible authentication protocol allows for multiple logon methods such as smartcard logon, certi cates, Kerberos, and public key authentication EAP is also frequently used with RADIUS, which is a central authentication service that can be used by RAS or VPN solutions

The exterior active sensor in Figure 7-9 produces a multiple-beam pattern Exterior sensors are susceptible to nuisance alarms from animals and vegetation that grows to a size that, when blown by the wind, causes detection Since the sensors are outdoors, weather such as fog, heavy rain, and winds blowing sand and dust can affect the reliability of the sensors and may attenuate the infrared energy The sensors can be defeated by tunneling underneath the sensors beams

#import "PenguinHuntingViewControllerh" @implementation PenguinHuntingViewController @synthesize penguinImageButton; @synthesize myTimer; @synthesize myPenguin; - (void) viewDidAppear:(BOOL)animated { selfmyPenguin = [[Penguin alloc] init]; if(selfmyPenguinstate == STATE_DEAD) { [selfpenguinImageButton setImage:[UIImage imageNamed:@"tux_deadpng"] forState:UIControlStateNormal]; } else { selfmyTimer = [NSTimer scheduledTimerWithTimeInterval:03 target: self selector:@selector(secondIncrement) userInfo: nil repeats: YES]; } } - (void) viewDidDisappear: (BOOL) animated { [selfmyPenguin persistPenguinState:selfmyPenguinstate]; [super viewDidDisappear:animated]; } static BOOL movingRight = YES; static BOOL movingDown = YES; - (void) secondIncrement { CGRect frame = selfpenguinImageButtonframe; if(frameoriginx > 210) { movingRight = NO; } else if (frameoriginx < 20) { movingRight = YES; } if(frameoriginy > 380) { movingDown = NO; } else if(frameoriginy < 20) { movingDown = YES; } if(movingDown) frameoriginy += 2; else frameoriginy -= 2; if(movingRight) frameoriginx += 2; else frameoriginx -= 2; selfpenguinImageButtonframe = frame; }

Once you have been authenticated to the network, you will then be authorized to access network resources There are various types of authorization based on what it is that you are trying to be authorized for For example, if you are trying to access a le on the network, authorization is determined based on the permissions assigned to the le If you are trying to change the time on the server, authorization is determined by your privileges or rights

- (IBAction) shootThePenguin: (id) sender { if(selfmyPenguinstate == STATE_ALIVE) { [selfmyTimer invalidate]; selfmyTimer = nil; [selfpenguinImageButton setImage:[UIImage imageNamed:@"tux_deadpng"] forState:UIControlStateNormal]; [selfmyPenguin shoot]; } else { selfmyTimer = [NSTimer scheduledTimerWithTimeInterval:03 target: self selector:@selector(secondIncrement) userInfo: nil repeats: YES]; [selfpenguinImageButton setImage:[UIImage imageNamed:@"tuxpng"] forState:UIControlStateNormal]; [selfmyPenguin revive]; } } - (void)dealloc { [selfpenguinImageButton release]; [selfmyTimer release]; [selfmyPenguin release]; [super dealloc]; } @end