keychain

Buzz Andersen: Simple iPhone Keychain Code
3 egyszeru method van benne es mukodik simulator-ban is meg device-on is:

+ (NSString *) getPasswordForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error;

+ (BOOL) storeUsername: (NSString *) username andPassword: (NSString *) password forServiceName: (NSString *) serviceName updateExisting: (BOOL) updateExisting error: (NSError **) error;

+ (BOOL) deleteItemForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error;

A code pedig itt van.
Egyebkent pedig: Keychain Services Programming Guide

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Itt pedig Chris Lowe peldaja ARC eseten.