jcmvbkbc

Latest versions of these scripts are available in git repository https://github.com/jcmvbkbc/esp32-linux-build

DavidBuchanan314

MD5 Collision with CRC32 Preimage

Here's the scenario: We want to craft two different messages with the same MD5 hash, and a specific CRC32 checksum, simultaneously.

In other words, we want an MD5 collision attack and a CRC32 preimage attack.

This might seem like a contrived scenario, but it's exactly the one I faced while producing my PNG hashquine (Yes OK maybe that's also a contrived scenario, cut me some slack).

On its own, a CRC32 preimage attack is trivial. You can craft a 4-byte suffix that gives any message a specific checksum, calculated using a closed-form expression (which I am too lazy to derive, not even with assistance from Z3). It's not an attack per-se, since CRC32 was never meant to be cryptograpically secure in the first place.

sradc

import math

class Var:
    def __init__(self, val: float, local_gradients=()):
        self.val = val
        self.local_gradients = local_gradients
        self.grad = 0

    def backward(self, path_value: float = 1):
        for child_var, local_gradient in self.local_gradients:

frabert

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.

In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit

katef

sub cloud_moomin {
  set resp.http.moomin00 = "                                                          %1b[38;5;237m▄%1b[38;5;235m▄%1b[49m";
  set resp.http.moomin01 = "                                                 %1b[38;5;237m▄%1b[48;5;237m%1b[38;5;249m▄%1b[38;5;236m▄%1b[49m     %1b[48;5;239m%1b[38;5;16m▄%1b[48;5;237m%1b[38;5;253m▄%1b[38;5;247m▄%1b[48;5;234m%1b[38;5;16m▄%1b[49m";
  set resp.http.moomin02 = "                                                 %1b[38;5;233m▄%1b[48;5;253m%1b[38;5;237m▄%1b[48;5;254m%1b[38;5;255m▄%1b[38;5;251m▄%1b[38;5;239m%1b[49m▄  %1b[38;5;237m▄ %1b[48;5;254m%1b[38;5;248m▄%1b[48;5;249m%1b[38;5;254m▄%1b[48;5;235m%1b[38;5;246m▄%1b[49m";
  set resp.http.moomin03 = "                                                  %1b[38;5;235m▄%1b[48;5;250m%1b[38;5;242m▄%1b[48;5;231m %1b[48;5;247m%1b[38;5;231m▄%1b[48;5;252m▄%1b[48;5;253m▄%1b[48;5;254m▄%1b[48;5;253m▄%1b[48;5;249m▄%1b[48;5;188m▄%1b[48;5;245m%1b[38;5;251m▄%1b[49m";
  set resp.http.moomin04 = "                                     

charlesroper

How to setup a practically free CDN using Backblaze B2 and Cloudflare

⚠️ Note 2023-01-21
Some things have changed since I originally wrote this in 2016. I have updated a few minor details, and the advice is still broadly the same, but there are some new Cloudflare features you can (and should) take advantage of. In particular, pay attention to Trevor Stevens' comment here from 22 January 2022, and Matt Stenson's useful caching advice. In addition, Backblaze, with whom Cloudflare are a Bandwidth Alliance partner, have published their own guide detailing how to use Cloudflare's Web Workers to cache content from B2 private buckets. That is worth reading,

rjhansen

SKS Keyserver Network Under Attack

This work is released under a Creative Commons Attribution-NoDerivatives 4.0 International License.

Terminological Note

"OpenPGP" refers to the OpenPGP protocol, in much the same way that HTML refers to the protocol that specifies how to write a web page. "GnuPG", "SequoiaPGP", "OpenPGP.js", and others are implementations of the OpenPGP protocol in the same way that Mozilla Firefox, Google Chromium, and Microsoft Edge refer to software packages that process HTML data.

Who am I?

maxidorius

Notes on privacy and data collection of Matrix.org

---

This version of the document is no longer canonical. You can find the canonical version hosted at Gitlab and Github.

PART 2 IS OUT, INCLUDING THE DISCLOSURE OF A GLOBAL FEDERATION DATA LEAK, AND THE ANATOMY OF A GDPR DATA REQUEST HANDLED BY MATRIX.ORG. SEE THE REPOS ABOVE.

yifanlu

Vinc0682

[dependencies]
sgx-isa = { version = "0.2", features = ["sgxstd"] }

# RustCrypto, used for CMAC
cmac = "0.2.0"
crypto-mac = "0.7.0"
aes = "0.3.2"
block-cipher-trait = "0.6.2"
generic-array = "0.12"