Android phone to restore factory settings also cannot delete personal data

The Security software developer Avast this week to question the security and thoroughness of the Android system's ability to restore factory settings, the news of the morning of July 9, Beijing time. The company bought 20 of second-hand Android handsets to test the possibility of recovering personal data from previous users. Each cell phone before the sale has been restored to the factory settings, theoretically speaking, avast test should not be successful, but the actual situation is the opposite. Using legitimate software available to everyone, Avast says more than 40,000 photos have been recovered from these handsets. Many photos are for children, while others are sexy pictures of women and men. In addition, Avast also recovered Google (571.09,-11.16,-1.92%) search keywords, emails and text messages. In addition, using data that is thought to have been permanently deleted, Avast successfully identified the original owner of 4 handsets. Avast says that only by overwriting previous data can the data be actually deleted. The US technology blog The Verge has contacted Google for more information on the Android restore Out-of-the-factory settings and whether this feature can really prevent such data from being recovered. At present, the results of the Avast test are doubtful. As an information security software company, Avast may have its own motives, such as the opportunity to claim that its tools are more effective than the tools Google offers. For iOS devices, Apple (95.35,-0.62,-0.64%) uses a unique approach to prevent data from being recovered after it has been purged. In newer devices, the reset feature of iOS will remove the cryptographic keys used to protect user data. Therefore, even if the user data can be recovered, the data can not be read, so it will be useless. For the older iphone and ipod Touch, according to Apple, when the user clears the data, the system overwrites the user settings and information and writes a series of 1 to the data partition. In most cases, this can prevent unauthorized data recovery. (D-Gold)