Cihangir Tezcan

Head of Department of Cyber Security, Informatics Institute and
Director of Cyber Security Center, Middle East Technical University, Turkey

[Cihangir Tezcan @forgottenlance]

Some people think that I am Satoshi and try to convince ChatGPT. But ChatGPT thinks that I am too awesome to be Satoshi 😂🤦#ai #chatGPT #Satoshi #BTC #Bitcoin

[AB Türkiye Delegasyonu🇪🇺EU Delegation to Türkiye @EUDelegationTur]

“Doğruluk Elçileri” bu hafta sonu @nezihorhon'un sunumuyla @cnnturk ekranlarında!
📺Cumartesi 15.30: Doç. Dr. Cihangir Tezcan ile siber güvenlik.
📺Pazar 15.30: @EUDelegationTur Başkan Yardımcısı Jurgis Vilčinskas ile AB'nin bilgi kirliliğine karşı global rolü.
🇪🇺🇹🇷

[AB Türkiye Delegasyonu🇪🇺EU Delegation to Türkiye @EUDelegationTur]

“Ambassadors of Truth” presented by @nezihorhon is on @cnnturk this weekend!
📺 Saturday 15.30: Cyber security with Assoc. Prof. Dr Cihangir Tezcan.
📺 Sunday 15.30: The EU’s global role in combating disinformation with Jurgis Vilčinskas, Deputy Head of the @EUDelegationTur
🇪🇺🇹🇷

[Cihangir Tezcan @forgottenlance]

Soon it may be legal in EU to train AI on sensitive data!!!!

[Lukasz Olejnik @lukOlejnik]

Wow, if @EU_Commission #GDPR modification proposal passes, AI will be able to train on sensitive data! "The development of certain AI systems and AI models may involve the collection of large amounts of data, including personal data and special categories thereof. In order not to disproportionately hinder the development and operation of AI derogating from the prohibition on processing special categories of personal data under Article 9(2) of Regulation (EU) 2016/679 should be allowed."

It will also put a stop to TROLLING and misusing #GDPR by certain individuals: "the right of access, which is from the outset favourable to data subjects, should not be abused or exploited by them for purposes other than the protection of their data. For example, such an abuse of the right of access would arise where the data subject intends to cause the controller to refuse an access request, in order to subsequently demand the payment of compensation, potentially under the threat of bringing a claim for damages. Other examples of abuse include situations where data subjects make excessive use of the right of access with the only intent of causing damage or harm to the controller"

[Fede’s intern 🥊 @fede_intern]

I’m finally out, safe and free. There was a small moment were things looked very bad but thanks to help from many I got released. Sorry if I didn’t answer every message. I was in calls non stop the last 24 hours with too many people and I only slept two hours.

Yesterday I landed in Izmir, Turkey to meet with builders, friends, and local businessmen. We are working on a DeFi project here and I also wanted to meet wine industry people to export our wine here and potentially invest in the country in the near future. I want to emphasize that I love Turkey and the Turkish people. I’m proud to say that some of my closest friends are turkish nowadays.

At passport control, the police detained me and said I couldn’t enter the country. They told me I needed to appear before a judge over a case that was opened there. I wasn’t allowed to use my phone, so my assistant reached out to local friends, who then contacted a Turkish attorney. The police warned me they would take my phone and that I would not be able to speak with anyone.

After a few hours, the attorney reached me and explained that the Minister of Internal Affairs had filed a case accusing me of helping others misuse @ethereum, allegedly in connection with a privacy protocol.

A few years ago, on the day Alexey was detained, we received a call, that gladly didn’t escalate any further, regarding an academic paper and code we had published about Tornado Cash, called Tutela. Our work showed that it was possible to deanonymize users. We never helped anyone engage in illegal activity, it was purely research on mixers and their properties.

To be clear:
a) We didn’t develop privacy features, only code and a paper showing heuristics to deanonymize users. We did want to work in more areas of Tornado but we couldn’t.
b) Even if we had worked on privacy and ZK for a protocol, targeting a software company for makes no sense to me.
c) Writing code to make transactions private doesn’t make you a criminal. Criminals are those who break the law. Would anyone jail Linus Torvalds because someone built a missile that uses the Linux kernel?

At one point, I was told my belongings would be taken and I would be moved elsewhere until charges were brought. Important friends from the UAE, UK, US, all around European Union, Argentina and the Catholic Church immediately stepped in to help, some contacting senior figures in Turkey to assist, they asked for explanations and supported me. There was a moment where I believe if a few of them didn’t intervene things might have gone sour. Thanks to their intervention I could stay with my phone at all time and now I’m back to Europe.

Our local Turkish attorney is already working on our defense. We still don’t have the full picture of what happened or why it happened, but we will bring in the best team we can and resolve this. If needed, one things are sorted out, I will come back to clear my name and defend ourselves. We have great local connections and lawyers. I’m not sure I will be able to tweet about this until we sort things out.

In recent months, my team and I experienced several smaller incidents I can’t discuss publicly. The world feels more fractured than just a few years ago, and resources are contested everywhere. Ou companies work at the frontier of cryptography, cybersecurity and AI. With time we will get better and better at we do. Most of what I did was with very little money. Now that we have more resources we can accelerate. I don’t plan on stop any of what we do.

[Dave "Someone you trust is one of us" Birch @dgwbirch]

How can banks, who enjoy a great income stream from interchange right now, position themselves for a world of retailer stablecoins and instant payments?

https://t.co/zGLLfPec7P

#Banks #InstantPayments #Stablecoins #Walmart #Amazon #FutureOfFintech #FintechNews @provokemgmt

[Official Commodore® @commodoreofcl]

We Just Made History! #Commodore Is Home! #retrogaming #gaming

[Bart Preneel @bpreneel1]

The risk of using symmetric key cryptography for large-scale infrastructures: a breach in your data center means replacing millions of keys (in this case in SIM cards) - a logistic nightmare.

[Inti De Ceukelaire @intidc]

If you train your AI model only to recognise license plates and not cars... this happens! (the police did not think it was funny)💀

[Cihangir Tezcan @forgottenlance]

As a bonus, I will show how you can break every GSM/GPRS communication :) #crypto #cybersecurity #ai #metu

[METU / ODTÜ @METU_ODTU]

"Learn & Connect: 5:40 Lecture Series” etkinlik serimizin altıncı seminerinde ODTÜ Enformatik Enstitüsü Siber Güvenlik Anabilim Dalı Başkanı ve Siber Güvenlik Merkezi Müdürü Doç. Dr. Cihangir Tezcan, “The New Frontiers of Cybersecurity” başlıklı sunumuyla bizlerle birlikte olacak.

📅 Tarih: 24 Nisan 2025, Perşembe
⏰ Saat: 5:40
📍 Yer: ODTÜ Kültür ve Kongre Merkezi (KKM), Kemal Kurdaş Salonu

Seminer sonrasında KKM büyük fuayede düzenleyeceğimiz kokteylde görüşmek üzere.

Tüm ODTÜ’lüleri etkinliğimize bekliyoruz.

[Cihangir Tezcan @forgottenlance]

Yarın #blockchain #crypto #cryptography

[Blockchain Days @DaysBlockchain]

(🇹🇷)
ODTÜ Siber Güvenlik Bölüm Başkanı olan Doçent Dr. Cihangir Tezcan Blockchain Days 2025’te bizimle olacak! ✨
Etkinlik biletleri ve tüm detaylar için biyografideki linki ziyaret edebilirsiniz.🎟️

(🇬🇧)
Associate Professor @forgottenlance, Head of Cybersecurity Department at METU, will be with us at Blockchain Days 2025! ✨
You can visit the link in biography for even tickets and all the details.🎟️
#BlockchainDays2025

[Ren Zhang @nirenzang]

Ethereum P2P network accommodates 7K+ services in one overlay. We found that its nodes struggle to find same-service peers (up to 45K+ attempts for one neighbor). Plus, it's surprisingly vulnerable to attacks–just 300 malicious nodes can isolate thousands. https://t.co/rpRrX9W7yx

[Bart Preneel @bpreneel1]

But it's encrypted with AES-128 - military grade security 😀

[Cihangir Tezcan @forgottenlance]

@ilkercanikligil İlker hocam geçmiş olsun. En kısa sürede çıkmanı bekliyoruz. Keşke izin verseler de Aydaki Adam'ın yeni bölümlerini Silivri'dekilerle çekebilsen. Çıkmadan önce hem anı olur hem de aydaki adamlar orada.

[thaddeus e. grugq @thegrugq]

Threat actor used an open webcam as a bounce into a network and deployed ransomware via SMB.

I’m still waiting for this to happen with smart lightbulbs or toasters.

Internet Of Threats

[Cory Doctorow NO LONGER ON TWIT TER @doctorow]

The commercial surveillance industry is almost totally unregulated. Data brokers, ad-tech, and everyone in between - they harvest, store, analyze, sell and rent every intimate, sensitive, potentially compromising fact about your life.

1/

[harryhalpin @harryhalpin]

This is why Ethereum needs to integrate against the @nymproject mixnet, and we’ve been saying for years.

[Cem Tezcan @cem_tezcan]

I'm super happy about my Procedural Handheld Console project took the 3rd place on Substance Designer Insanity Awards!
https://t.co/cU3fcktvG7

[Bart Preneel @bpreneel1]

What could go wrong?

[Cihangir Tezcan @forgottenlance]

GPU Optimization of Advanced Encryption Standard (Free Course)
#Crypto #cryptography #cybersecurity #GPU #Nvidia #cuda #encryption #optimization #free #course #AES

https://t.co/sqwgJpp6zA

[Joseph Cox @josephfcox]

New from 404 Media: Telegram has handed U.S. authorities data on thousands of its users. An absolutely massive spike in data turn overs after the arrest of Telegram CEO Durov.

Was ~100 impacted users to U.S. authorities in October. Now 2253.

https://t.co/hQr7gIHaRS