i0n1c, whose real name is Stefan Esser, is a German security researcher. He developed Antid0te, an ASLR for jailbroken iPhones in fall 2010, but never released it, because iOS since 4.3 includes an implementation of ASLR. He developed an untethering exploit for iOS 4.3. He gave a version of the exploit that worked on iOS 4.3.1 to the iPhone Dev Team which updated redsn0w and PwnageTool to use it and released the new tools on 4 April 2011. sn0wbreeze was also updated to include his untether. As the vulnerability went unpatched in iOS 4.3.2 and 4.3.3, he updated his code later to support those firmwares. An iOS 4.3-compatible version was never released. His exploit was used in Pangu jailbreak.
On 19 April 2015 he released a YouTube video of a iOS 8.4 beta jailbreak, he has said he will not release it to the public.
- iOS 678 Security - A Study in Fail
- Ruxcon 2014 - iOS8 Containers, Sandboxes and Entitlements
- SyScan Singapore 2012: iOS Kernel Heap Armageddon (PDF)
- CanSecWest 2012: iOS5, an Exploitation Nightmare (PDF) [Archived 2013-09-14 at the Wayback Machine]
- BlackHat US 2011: Exploiting the iOS Kernel (PDF)
- HITB 2011 Malaysia: iPhone Exploitation - One ROPe to bind them all?