Cristian Sandu

Blockchain Developer Cegeka Romania


I am an experienced (and passionate) C++ developer with a background in both mobile and desktop development. I am interested in cryptocurrencies, 3D printing and of course software development.

I joined Cegeka as a blockchain developer in May of 2015 following my interest in cryptocurrencies. During this time, I have worked on several projects for the financial world involving blockchain solutions (using Ripple and Ethereum).

Previously I worked for the game company Gameloft as an iOS technical lead where my attributions included finding smarter ways to block game cracks and cheaters.

I have been a loyal DefCamp attendee for the past 3 years and I think it’s getting cooler every year.

Security of Mobile Cryptocoin Wallets

With mobile devices offering more and more hardware security options it has become interesting to implement secure cryptocurrency wallet apps on iOS and Android(Bitcoin and altcoins but not only).

For iOS the most attractive solution is the Secure Enclave which has been added in hardware starting with the iPhone 5s(Apple A7 chip). The Secure Enclave allows for on chip signing of transactions without ever exposing the private key but that presents some unique challenges which we will detail in the paper.

In this presentation we introduce a practical implementation of transaction signing on an iOS device using the Secure Enclave in a manner which never exposes the private key.

Are you the next cyber security superstar?

If you are passionate about an information security topic or you have strong technical skills developing researches on your own, you should definitely Apply at Call for Papers. By submitting you will have the chance to showcase your work to +2000 attendees.

Other speakers joining this year

Yury Chemerkin

Security Expert

Bryson Loughmiller

Information Security Engineer Adobe

Ionut Popescu

Senior Penetration Tester SecureWorks

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Sponsors & Partners

They help us make this conference possible.


Orange Romania is part of the Orange Group, one of the largest global telecommunications operators that connects hundreds of millions of customers worldwide. With over 11 million local customers and an annual turnover exceeding 1.5 billion euros, Orange Romania connects 1 in 2 Romanians and offers an extensive range of communication solutions for both individual and corporate customers, from basic connectivity services to complete mobile, fixed internet, TV packages, and complex IT&C solutions through Orange Business

Orange Romania is the number 1 operator in terms of network performance, and also holds nine consecutive Top Employer certifications, which confirm that Orange Romania, in addition to the remarkable products and services it offers, pays special attention to its employees and working environment. In the past 3 years Orange has launched two 5G Labs in Bucharest and Iasi, that aim to support researchers, startups and companies to test their 5G solutions in advance. 

In addition, Orange is a long-term supporter of the startup ecosystem through the Orange Fab accelerator program designed to support entrepreneurs in the development of innovative products and their distribution locally and internationally.

Gold Partners

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Silver Partners

Bronze Partner