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Wireless Communication in Underground Mines: RFID-based Sensor Networking focuses on the recent advances in wireless communication technologies for underground mines and other hazardous areas. This comprehensive book provides a unified foundation of wireless communication systems for transmission of data, voice and video, and incorporates intrinsically safe design and development aspects of circuits, which are essential for hazardous areas. Topics covered in this book include design and development of an intrinsically safe trapped miner communication system, shaft communication system, line-of-sight communication system, mine-wide communication system, and web based information system. RFID technology is also discussed in detail, including compatible system specific embedded software for underground applications and program codes for different devices. Wireless Communication in Underground Mines: RFID-based Sensor Networking covers a wide range of wireless communication systems as well as wireless sensor networking, radio frequency identification devices, and intrinsically safe circuit design techniques for underground mines and other hazardous areas. Designed for practicing engineers, the book incorporates all the technical details starting from design, fabrication, assembling, intrinsic safety analysis, testing, laboratory and field trials, deployment and operations of different wireless communication systems.

In the previous article, we looked at the different ways in which we could analyze the network traffic and the api calls being made through an IOS application. In this article, we will look at how we can dump the contents of the Keychain from an IOS device. Ethical Hacking Training – Resources (InfoSec) Keychain Basics According to Apple, a Keychain in an IOS device is a secure storage container that can be used to store sensitive infromation like usernames, passwords,network passwords, authentication tokens for different applications. Apple itself uses the Keychain to store Wi-fi network passwords, VPN credentials etc. It’s a sqlite database file located at /private/var/Keychains/keychain-2.db and all the data stored in it is encrypted. Developers usually want to leverage this feature of the operating system to store credentials rather than storing it themseleves in NSUserDefaults, plist files etc.

The reason for this could be that the developer may not want the user to log in everytime and hence store the authentication information somewhere in the device and use it to log in the user automatically whenver the user opens up the app again. The keychain information for every app is stored outside of its sandbox. It is also possible to share keychain data between applications through keychain access groups. This group has to be specified while saving the data in the keychain. The best way of saving data in Keychain is to use the KeychainItemWrapper class by Apple.

A sample project can be found. The first step is to create an instance of the class. KeychainItemWrapper *wrapper = [[KeychainItemWrapper alloc] initWithIdentifier:@”Password” accessGroup:nil]; The identifier will help in fetching this information from the keychain later. In case you have to share information across applications, then you will have to specify an access group. Applications with the same access group can have access to the same keychain information. KeychainItemWrapper *wrapper = [[KeychainItemWrapper alloc] initWithIdentifier:@”Account Number” accessGroup:@”YOUR_APP_ID_HERE.com.yourcompany.GenericKeychainSuite”]; To save info in the keychain, just use the setObject:forKey: method. In this case (id)kSecAttrAccount is a predefined key that we can use to define the account name for which we are storing the data.