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There are a number of key benefits that can be gained through the implementation of multiple keychains, mainly due to some security implications that are present by default in the login keychain For instance, we learned a bit earlier that the login keychain is unlocked by default at user login, and that it has no lock timeout; that is, it will remain unlocked until the user logs out, or manually locks it This means that if a user leaves their node while logged in and unlocked, a sneaky malevolent person could fire up Safari and gain access to any website that has its password stored in that unlocked keychain New keychains, when created, have a default auto lock setting of five minutes That means that a user unlocks this keychain for use, it will automatically lock itself five minutes later.

For purposes of reference, I give first a definition of the relational UNION operator: Let tables a and b be of the same type TT. Then the union of those two tables, a UNION b, is a table of the same type TT, with body consisting of all rows r such that r appears in a or b or both. (Of course, a and b here aren t necessarily base tables; they might, for example, be the results of previous queries.) This definition is based on one given in the 8th edition of my book An Introduction to Database Systems (Addison-Wesley, 2004). The body of a table is the set of rows in that table. Figure 16-1 shows a trivial example of two tables, T1 and T2, together with their union. I ve assumed for simplicity that all columns are of type INTEGER. Observe in particular that the union in this example has four rows, not five (because duplicates are eliminated ).

If a malevolent user attempts to access a resource utilizing a password item in a locked keychain, they won t have access: the keychain must first be unlocked Thus, utilizing a second keychain provides a bit more security in that regard While it is certainly possible to configure the login keychain to auto lock, or even change its password to a value different then the login password, doing so can sometimes result in an annoyance to end users, as they may complain about having to constantly enter their password Thus, maintaining multiple passwords can help to achieve security without negatively affecting usability In such a configuration, the login keychain can be utilized for oft-used and less sensitive information, such as casual websites or commonly used applications that utilize the keychain framework.

The actual property is accessed using an array notation, where the array is the object instance and the index is the string value property identifier (eg, obj[property]) As each property is iterated, the serialization first queries if the property should be serialized by calling the canProcessFilter callback function If the property can be serialized, then a switch statement is called that tests the type of the property The typeof function returns six different identifiers, of which five are of interest (we are not interested in undefined, as undefined should not be serialized) The details of the switch statement are as follows..

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The second keychain then could be used for data of higher sensitivity such as passwords to financial websites, secure notes containing personal information, or passwords to confidential servers For example, this author utilizes three different keychains on his own machine The login keychain is fairly sparse, and contains only minimal credentials such as passwords to commonly used wireless networks, S/MIME Certificates (utilized by Mailapp to validate email messages we receive from colleagues), and access to various innocuous social websites and web forums This keychain also contains a few application passwords For instance, we utilize MobileMe for syncing our data, so we have our MobileMe passwords stored in this keychain to avoid being prompted for a password every time it wants to synchronize The next keychain is used solely for financial and personal data and credentials.

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This keychain has extremely aggressive auto-lock settings, and utilizes a password that is over 12 characters long to ensure that it is not a password that can easily be broken through a brute-force attack The last keychain we maintain contains all credentials that we utilize professionally This keychain also has extremely aggressive auto-lock settings, and is protected by an extremely secure and unique password To provide additional security to all of our keychains, we have configured every keychain in our systems, including the login keychain, to lock whenever the machine sleeps To configure this and keychain auto locking settings, select the menu option Change Settings for Keychain <keychain name> found under the Edit menu in the Keychain Access application (select the appropriate keychain first) This dialog is seen in Figure 9 6..