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Alexandros Kapravelos
Works at UC Santa Barbara
Attends University of California, Santa Barbara
Lives in Santa Barbara, CA, USA
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Alexandros Kapravelos

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There is a new +USENIX security conference focusing on emerging threats and novel attacks. Find out more at http://enigma.usenix.org/
BERKELEY, CA--(Marketwired - Aug 11, 2015) - Building on 40 years of success in presenting computing conferences featuring cutting edge research, the nonprofit USENIX Association today announced Enigma -- a uniquely positioned vendor-neutral security conference. With support from founding sponsor Google, Enigma will be held January 25-27, 2016, in San...
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Alexandros Kapravelos

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"A newly discovered bug seems to cause Messages on iOS to crash when a specific string of text is received—and if it happens while the phone is locked, it also seems to reboot the iPhone too."
A newly discovered bug seems to cause Messages on iOS to crash when a specific string of text is received—and if it happens while the phone is locked, it also seems to reboot the iPhone too.
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Not working on my friend's iPhone... Maybe because the language is German? Who knows...

Alexandros Kapravelos

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"VENOM, CVE-2015-3456, is a security vulnerability in the virtual floppy drive code used by many computer virtualization platforms. This vulnerability may allow an attacker to escape from the confines of an affected virtual machine (VM) guest and potentially obtain code-execution access to the host."

Xen, KVM, and the native QEMU client seem to be affected.

http://venom.crowdstrike.com/
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Alexandros Kapravelos

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Very interesting research by Google about adversarial examples targeting ML.

"[...] by applying small but intentionally worst-case perturbations to examples from the dataset, such that the perturbed input results in the model outputting an incorrect answer with high confidence"
 
Is that a Panda, or a Gibbon? Investigating the mystery of Adversarial Examples

Machine Learning (ML) models show great promise in the field of computer vision, which focuses on enabling systems to model and understand digital images automatically (https://goo.gl/whsbSH). 

But sometimes those ML systems get it wrong. As it turns out, many machine learning models, including Neural Networks, have intriguing properties. One such property, “blind spots” (http://goo.gl/FPuCzk), causes them to misclassify adversarial examples - images that are formed by applying very small, but intentional, perturbations to existing correctly labeled examples. Moreover, when these different models misclassify an adversarial example, they often agree with each other on its class. But why does this happen? 

At the 2015 International Conference on Learning Representations (http://goo.gl/DxCNM1), Google Research Scientists +Ian Goodfellow, +Jon Shlens, and +Christian Szegedy presented Explaining and Harnessing Adversarial Examples (http://goo.gl/XCMCun), where they investigate neural networks’ vulnerability to adversarial perturbation.

Previously, the thinking was that adversarial examples were due to overfitting and the non-linear nature of Deep Neural Networks. In this paper, the authors argue that, rather, existing models are too linear, and that generalization of adversarial examples across different models can be explained as a result of the  different models learning similar functions when trained to perform the same task. In doing so, they propose a fast method of generating adversarial examples that can be used to help train models to resist adversarial perturbation.
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Alexandros Kapravelos

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Finally Microsoft is fixing from a security perspective in their new browser. No more ActiveX (among other things)! #microsoftedge

http://blogs.windows.com/msedgedev/2015/05/11/microsoft-edge-building-a-safer-browser/
With Microsoft Edge, we want to fundamentally improve security over existing browsers and enable users to confidently experience the web from Windows. We have designed Microsoft Edge to defend users from increasingly sophisticated and prevalent attacks. This post covers some of the advanced technologies used to protect Microsoft Edge, including industry leading sandboxing, compiler, and... <a href="http://blogs.windows.com/msedgedev/2015/05/11/mi...
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I specifically liked this: "we are working on plans for a modern, HTML/JS-based extension model."

Alexandros Kapravelos

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An introduction to JavaScript-based DDoS
CloudFlare protects millions of websites from online threats. One of the oldest and most pervasive attacks launched against websites is the Distributed Denial of Service (DDoS) attack. In a typical DDoS attack, an attacker causes a large number of computers...
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Alexandros Kapravelos

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SafeStack is now integrated into LLVM
This patch adds the safe stack instrumentation pass to LLVM, which separates the program stack into a safe stack, which stores return addresses, register spills, and local variables that are static...
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Alexandros Kapravelos

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Got your USENIX Security paper rejected? Feeling unloved? Don't worry. there is a solution: http://www.raid2015.org/
Conference dates November 2-4. The 18th International Symposium on Research in Attacks, Intrusions and Defenses, previously known as Recent Advances in Intrusion Detection, will be held in Kyoto, Japan. This symposium brings together leading researchers and practitioners from academia, ...
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Alexandros Kapravelos

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United Airlines launches a bug bounty program, remote code execution is awarded with 1,000,000 miles /pinkymove

http://www.united.com/web/en-US/content/Contact/bugbounty.aspx
Find out about the United Bug Bounty program, which allows researchers to report website vulnerabilities and earn award miles.
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"we’ve since observed malicious software forcing users into the developer channel in order to install unwanted off-store extensions"

https://blog.chromium.org/2015/05/continuing-to-protect-chrome-users-from.html
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Alexandros Kapravelos

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"Over the 6 years since we started the project, we’ve been involved in 11 minor accidents (light damage, no injuries) during those 1.7 million miles of autonomous and manual driving with our safety drivers behind the wheel, and not once was the self-driving car the cause of the accident."

https://medium.com/backchannel/the-view-from-the-front-seat-of-the-google-self-driving-car-46fc9f3e6088
After 1.7 million miles we’ve learned a lot — not just about our system but how humans drive, too.
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Stratos Dimopoulos's profile photo
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Daniel McCarney's profile photo
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Abdul Ghayas Safi's profile photo
Theodoros Dionysiou's profile photo
Giorgos Stratakis's profile photo
Valentina Pizzi's profile photo
Manuela Geiger-Kolbitsch's profile photo
Education
  • University of California, Santa Barbara
    Computer Science, 2010 - present
  • University of Crete
    MSc - Computer Science, 2007 - 2010
  • University of Crete
    BSc - Computer Science, 2002 - 2007
Basic Information
Gender
Male
Apps with Google+ Sign-in
  • Plants vs. Zombies 2
Work
Occupation
Research Assistant - PhD Candidate
Skills
Web Security
Employment
  • UC Santa Barbara
    Research Assistant, 2010 - present
  • ICSI, International Computer Science Institute
    Intern, 2013 - 2013
    http://www.icsi.berkeley.edu/icsi/blog/alexandros-kapravelos-joins-networking
  • FORTH, Foundation for Research & Technology - Hellas
    Research Assistant, 2005 - 2010
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Santa Barbara, CA, USA
Previously
Heraklion, Greece - Thessaloniki, Greece
Alexandros Kapravelos's +1's are the things they like, agree with, or want to recommend.
Fotos - Aplicaciones Android en Google Play
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Google Fotos es un lugar para poner todas tus fotos y videos, donde puedes hacer búsquedas y donde el contenido está organizado por personas

StrongLifts 5x5 Workout
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A simple workout to get stronger. Three exercises, three times a week, 45 minutes per workout. Thousands of people worldwide have used the S

Google Calendar
market.android.com

The Calendar app displays events from each of your Google Accounts that synchronizes with your Android device. You can also:- Create, edit,

NEBMATV
plus.google.com

Ένα απο τα μακροβιότερα συγκροτήματα της Ελλάδας αποτελείται σήμερα απο τους Ισορροπιστή, Αλχημιστή &amp; DJ Rico.

Splitwise
market.android.com

Splitwise is the best way to share bills and IOUs and make sure that everyone gets paid back.Use Splitwise to split household bills with roo

Lastline, Inc.
plus.google.com

The Leader in Advanced Malware Protection

reddit
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The Front Page of the Internet

Asana
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Do Great Things

Pocket
market.android.com

*****Time’s Best Android Apps of 2013***** *****Google Play Best of the Best for 2012*****Pocket lets you take your content with you. Whenev

Duolingo: Learn Languages Free
market.android.com

Learn Spanish, French, German, Portuguese, Italian, and English. Totally fun and 100% free."Among apps for learning or practicing a language

The Wire
market.android.com

HBO presents this highly realistic and totally unvarnished drama series that chronicles the vagaries of crime, law enforcement, politics, ed

True Blood
market.android.com

HBO's hit drama series created by Alan Ball ('Six Feet Under') and based on the best-selling Sookie Stackhouse novels by Charlaine Harris ab

Game of Thrones
market.android.com

Trouble is brewing in Westeros. For the inhabitants of this world, control of the Iron Throne holds the lure of great power...and far-reachi

Ο θειος Τάκης και ο θειος Τάκης, του Χρήστου Χωμενίδη | Protagon
www.protagon.gr

«Η σύνταξή μου έχει πέσει στο μισό, δεν έχω πια να δώσω χαρτζιλίκι στα εγγόνια μου. Το εφάπαξ έγινε προίκα για τις θυγατέρες μου-χωρίσανε κα

Google Keep
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Quickly capture what’s on your mind and recall it easily wherever you are. Create a checklist, enter a voice note or snap a photo and annota

Dots: A Game About Connecting
market.android.com

The beautiful and addictive hit game Dots is now available on Android phones and tablets! The task is simple; connect as many same-colored d

Πάνω απ' το πτώμα...του Μπουτάρη, του Τάσου Μελετόπουλου | Protagon
www.protagon.gr

«Πάνω από το πτώμα μου θα περάσετε για να τα κουκουλώσετε τα αρχαία και να τα απομακρύνετε από τον σταθμό». Αυτό διεμήνυσε στον υπουργό Πολι

Public - a month ago
reviewed a month ago
Public - 9 months ago
reviewed 9 months ago
Very nice fajita burritos in a good family-owned restaurant.
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reviewed a year ago
Public - 2 years ago
reviewed 2 years ago
13 reviews
Map
Map
Map
clover coffee ftw!
Public - 9 months ago
reviewed 9 months ago
Amaro flight + very nice pizza!
Public - a year ago
reviewed a year ago
Nice and quick way to get fresh fish to eat. From the market to your plate!
Food: Very GoodDecor: Very GoodService: Very Good
Public - 2 years ago
reviewed 2 years ago