Author Archives: Jonathan Zdziarski

About Jonathan Zdziarski

Respected in his community as an iOS forensics expert, Jonathan is a noted security researcher, penetration tester, and hacker. Author of many books ranging from machine learning to iPhone hacking and software development, Jonathan frequently trains many federal and state law enforcement agencies in digital forensic techniques and assists law enforcement and the military in high profile cases. Jonathan is also inventor on several US patent applications, father of DSPAM and other language classification technology, and an App Store developer. All opinions expressed on this website are the author's own. Follow Jonathan on Twitter: @JZdziarski

Apple Confirms “Backdoors”; Downplays Their Severity

Apple responded to allegations of hidden services running on iOS devices with this knowledge base article. In it, they outlined three of the big services that I outlined in my talk. So again, Apple has, in a traditional sense, admitted … Continue reading

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Apple Responds, Contributes Little

In a response from Apple PR to journalists about my HOPE/X talk, it looks like Apple might have inadvertently admitted that, in the most widely accepted sense of the word, they do indeed have backdoors in iOS, however claim that … Continue reading

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Slides from my HOPE/X Talk

Identifying Backdoors, Attack Points, and Surveillance Mechanisms in iOS Devices In addition to the slides, you may be interested in the journal paper published in the International Journal of Digital Forensics and Incident Response. Please note: they charge a small … Continue reading

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Silk Sun

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Tone Mapping Your Photography with Topaz Simplify

Lately I’ve been writing articles about Topaz Simplify, and some of the things you can do with it. Most people think tools like Simplify are only useful for creating mosaics or other types of artful interpretations of a photograph, but … Continue reading

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Augmenting Surrealistic HDRs with Topaz Simplify

This is a very small post-processing trick I’ve picked up that can help take the edge off of an HDR or other type of photo that just needs a touch of surrealistic contrast. Here, I’m using a product called Topaz … Continue reading

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Evening Silk

Bar Harbor, Maine has one of the earliest sunrises on the eastern seaboard. Which is exactly why I decided to sleep in, and find some good sunset locations instead. I did, actually, find some good sunrise locations (a few hundred … Continue reading

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Celebrating Hackers in Portrait and Journalism

Hackers are often engaged in the arts, as we’re creative people. I’m a hacker, a purveyor of funky bass guitar, a Greek nerd, and a photographer (as well as a number of other things). As a photographer, one of my … Continue reading

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The Better Your “Workflow”, the More Your Photos Need Help

Lately, I’ve seen countless budding photographers offer video courses (for a hefty price) that teach people about workflow; how to make your photos dazzle and look just like their photos. The kind of “retouch ’till you’re blue in the face” kind … Continue reading

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Icy Pond

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