Lexical captcha beat down - Structured attack approach
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CAPTCHAs are becoming more complex and pretend sometimes to be "bot-proof". In the case of Lexical CAPTCHAs that try to mimic a somewhat turing-like test that need to be countered by a human being - we have a botproof feeling that I try to demistify in this talk. Code for the PoC can be found here: https://github.com/dalmoz/CAPLex
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![INTRO – CAPTCHA PROMISE
• CAPTCHAs are there to protect against misuse – flood,
automated attacks
• Minimizing impact of flood, DDoS, misuse and control.
• /=-3r]]-3]] Humans, confirm! /132—[](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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This is a workshop about communication and collaboration. We will experience how we can analyze the reasons for resistance to change (exercise 1) and practice how to improve our conversation style and be more in control and effective in the way we communicate (exercise 2).
This session will use Dave Gray’s Empathy Mapping, Argyris’ Ladder of Inference and The Four Rs from Agile Conversations (Squirrel and Fredrick).
Abstract:
Let’s talk about powerful conversations! We all know how to lead a constructive conversation, right? Then why is it so difficult to have those conversations with people at work, especially those in powerful positions that show resistance to change?
Learning to control and direct conversations takes understanding and practice.
We can combine our innate empathy with our analytical skills to gain a deeper understanding of complex situations at work. Join this session to learn how to prepare for difficult conversations and how to improve our agile conversations in order to be more influential without power. We will use Dave Gray’s Empathy Mapping, Argyris’ Ladder of Inference and The Four Rs from Agile Conversations (Squirrel and Fredrick).
In the session you will experience how preparing and reflecting on your conversation can help you be more influential at work. You will learn how to communicate more effectively with the people needed to achieve positive change. You will leave with a self-revised version of a difficult conversation and a practical model to use when you get back to work.
Come learn more on how to become a real influencer!
Artificial Intelligence, Data and Competition – SCHREPEL – June 2024 OECD dis...
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This presentation by Thibault Schrepel, Associate Professor of Law at Vrije Universiteit Amsterdam University, was made during the discussion “Artificial Intelligence, Data and Competition” held at the 143rd meeting of the OECD Competition Committee on 12 June 2024. More papers and presentations on the topic can be found at oe.cd/aicomp.
This presentation was uploaded with the author’s consent.
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Lexical captcha beat down - Structured attack approach
- 1. LEXICAL CAPTCHA BEAT-DOWN STRUCTURED ATTACK APPROACH Moshe Zioni twitter: @dalmoz_ email: zimoshe-gmail Distribution and derivation is allowed under the GNU Free Documentation License
- 2. INTRO – CAPTCHA PROMISE • CAPTCHAs are there to protect against misuse – flood, automated attacks • Minimizing impact of flood, DDoS, misuse and control. • /=-3r]]-3]] Humans, confirm! /132—[
- 3. GOING LEXICAL • CAPTCHA is commonly known as this • It doesn’t have to be that way…
- 5. SO… LEXICAL ANALYSIS • BASICS – no rocket science needed, but a human mind is mandatory (synaptic connections enabled) • 121 VS LEXICAL • Where to find them?
- 7. Example
- 8. Stream to tokens Identifier 1 Identifier 2
- 9. So, what? Identifier 1 Identifier 2
- 10. LEXER BUILDING
- 11. STEPS IN LEXER PROCESSING • Fetcher • Scan • Clean/Translate (?) • Head Selection • Head • Clean/Translate (?) • SOLUTION!
- 12. YEAH! Really… Now what?
- 13. Real world example • What word from "anointed, daringly, redeployment" begins with "r"? • Enter the largest number of 99, sixty three, 55 or 19: • "ketch" has how many letters?
- 14. Fetch • What word from "anointed, daringly, redeployment" begins with "r"?
- 15. Scan • What word from "anointed, daringly, redeployment" begins with "r"? • Tokenizing – 1, 2, 3, 4, 5 • Distinct tokenization • Binary Tree – Boolean Logic
- 16. Process stream • What word from "anointed, daringly, redeployment" begins with "r"? • Always clean after scanning • Beware of pitfalls – you need to be sure of your scanning
- 17. Coverage • Why it’s important? • How to define coverage? • Brute force • Combinatorics (if given a number)
- 18. Efficiency • In Lab is different than real world • Good and Bad • If no other options after scanning - Always guess
- 19. Proof-of-Concept • Available at GitHub: https://github.com/dalmoz/CAPLex
- 21. Questions
- 22. Thank you • Moshe Zioni • Zimoshe-gmail • @dalmoz_