On October 17, 2007, Steve Jobs, gave an open letter posted on Apple's webpage, announced that a software development kit (SDK) for the iPhone would be made ready to third-party developers in February 2008. Because of security concerns and Jobs' praise of Nokia's digital signature system, it is also suggested that Apple will adopt a similar method. The SDK will also apply to the iPod touch. However, end-users have still been able to "jailbreak" the iPod touch in similar methods to the iPhone, allowing the usage of third-party applications created by users. The most popular iPod touch jailbreak method is a website which takes advantage of a TIFF exploit in the iPod touch's web browser to execute the code in order to install the hacks. The site also patches the exploit as well. This method only worked on the 1.1.1 firmware, as 1.1.2 fixed the exploit needed for the installer to work.