Zero

345 posts

Zero

Zero

@zeroisabot

Security Researcher

::1 Se unió Aralık 2016
399 Siguiendo42 Seguidores
Zero retuiteado
jitesh💙
jitesh💙@Jitesh_117·
someone should make a vscode extension which plays "FAAAAH" sound whenever a test fails
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Zero retuiteado
Jay Alto
Jay Alto@theJayAlto·
you pity the moth confusing a lamp for the moon, yet here you are confusing a screen for the world
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Zero
Zero@zeroisabot·
@immunefi chat, am I cooked?
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Immunefi
Immunefi@immunefi·
If you're: - an SR - under $100k net worth - over 20 - no gf/wife - overweight
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Zero
Zero@zeroisabot·
U.S politics seem like an episode of The Boys. Not sure which is the parody
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Zero retuiteado
vixhaℓ
vixhaℓ@TheVixhal·
She broke up with me last week. Not because I cheated. Not because I was broke. Not even because I forgot her birthday. But because, in her words: “No matter what I do, you never change your direction.” At first, I thought she was just calling me stubborn. Then my inner math brain clicked... She was literally describing an eigenvector. See, in math, when you apply a transformation (matrix A) to a vector (v), most vectors get spun around, twisted, thrown somewhere else. They change direction and magnitude. But an eigenvector is different - it keeps the same direction. The only thing that changes is its scale, given by something called an eigenvalue (λ). If λ = 2 → The vector doubles in size. If λ = 0.5 → It shrinks. If λ = -1 → It flips direction. If λ = 1 → It stays the same size. Apparently… in her eyes, I was λ = 1. Always same size. Always same direction. Now the math part (because unlike my ex, I actually explain things): Here’s how you find eigenvalues and eigenvectors, using a 2×2 matrix example: Let’s say our “relationship matrix” was: A = [ 2 1 ] [ 1 2 ] Step 1: Find eigenvalues (λ) We solve: A·v = λ·v → (A − λI)·v = 0 → det(A − λI) = 0 Subtract λ from each diagonal entry of A: A − λI = [ 2−λ 1 ] [ 1 2−λ ] Set determinant = 0 and solve for λ: Determinant: (2−λ)(2−λ) − 1 = (2−λ)² − 1 = 0 (2−λ)² = 1 2−λ = ±1 Case 1: 2−λ = 1 → λ = 1 Case 2: 2−λ = −1 → λ = 3 So, eigenvalues are: λ₁ = 1, λ₂ = 3 Step 2: Find eigenvectors (v) For λ = 1: (A − λI)·v = 0 [ 2−λ 1 ] [ x ] = [ 0 ] [ 1 2−λ ] [ y ] [ 0 ] [ 2−1 1 ] [ x ] = [ 0 ] [ 1 2−1 ] [ y ] [ 0 ] [ 1 1 ] [ x ] = [ 0 ] [ 1 1 ] [ y ] [ 0 ] From the first row: x + y = 0 y = −x From the second row: x + y = 0 y = −x So eigenvector = any scalar multiple of [ 1, −1 ]ᵀ For λ = 3: (A − λI)·v = 0 [ 2−λ 1 ] [ x ] = [ 0 ] [ 1 2−λ ] [ y ] [ 0 ] [ 2−3 1 ] [ x ] = [ 0 ] [ 1 2−3 ] [ y ] [ 0 ] [ -1 1 ] [ x ] = [ 0 ] [ 1 -1 ] [ y ] [ 0 ] From the first row: −x + y = 0 y = x From the second row: x + (-y) = 0 x - y = 0 x = y So eigenvector = any scalar multiple of [ 1, 1 ]ᵀ Final result: λ = 1 → v = [ 1, −1 ] λ = 3 → v = [ 1, 1 ] Congratulations 🎉, you have just learned how to find the eigenvectors and eigenvalues of a matrix. Bonus: Why does AI-ML care? Eigenvalues & eigenvectors are everywhere in AI/ML: PCA → Reduce dimensions by keeping top eigenvectors of covariance matrix (largest eigenvalues = most variance). Spectral Clustering → Graph Laplacian eigenvalues help find clusters. Neural Stability → Eigenvalues of weight matrices can indicate exploding/vanishing gradients. Markov Chains → Long-term behaviour = eigenvector of eigenvalue 1. In short: Eigenvectors tell you the “unchangeable direction” under a transformation. Eigenvalues tell you “how much” that direction is stretched. In ML, this is how we find patterns, compress data, and understand model behaviour. I am waiting for a matrix that multiplies me by λ > 1 and actually makes me grow.
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Zero retuiteado
Immunefi
Immunefi@immunefi·
When you know there's a bug in the codebase but can't prove it yet.
Immunefi tweet media
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Zero retuiteado
Dave W Plummer
Dave W Plummer@davepl1968·
I'm so old I wrote that! That's assuming it's the Windows version, which is the one I worked on. The Win9x game, art, and original code, were done by Maxis/Cinematronics. I ported it to Windows NT, converted the x86 asm to C, made it work on RISC, and so on. Success has many fathers, and all credit should really go to the original designers... I'm just the fun uncle that brought it to the masses.
Dave@GamewithDave

Are you this old?

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Massimo
Massimo@Rainmaker1973·
Born 97 years ago Today, John Nash was the game theorist who won the 1994 Nobel Prize in economics and was portrayed by Russell Crowe in 'A Beautiful Mind'. This is his recommendation letter, possibly the best ever
Massimo tweet media
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Zero
Zero@zeroisabot·
You SRs are so inspiring with your crits, I'm soo pumped
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Zero
Zero@zeroisabot·
How in God's name are you all finding crits so damn easily
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Zero retuiteado
John Cena
John Cena@JohnCena·
Have the discipline to do what needs to be done, especially when you don’t feel like it.
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Zero retuiteado
𝙈𝙧𝙕𝙚𝙙💫
𝙈𝙧𝙕𝙚𝙙💫@spinitbackzed·
Kanye West waking up and seeing all the damage done by Ye
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Zero
Zero@zeroisabot·
Time to prove that I'm a problem
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Zero
Zero@zeroisabot·
@0xriptide I initially read the $3k USD as 3k ETH until it dawned on me💀
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riptide
riptide@0xriptide·
what would be an appropriate bounty for reporting a critical bug draining 12,000 ETH
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Zero
Zero@zeroisabot·
@00xSEV I feel the exact same way, well said - perhaps a healthy combination of both of them would yield much better results.
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Sev
Sev@00xSEV·
I think BB might keep you in illusions about your skill due to the long feedback loop (either "I'm good, just unlucky" or "I can't find anything for months, I must be bad") The same goes for private solo audits without others reauditing the same code With contests, feedback is faster, and you can easily compare yourself to others
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