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  • Doing the two-step until the end of time

    SECURITY

    Doing the two-step until the end of time

    Jeffrey Goldberg by Jeffrey Goldberg Dec 20, 2012

    In my discussion of Dropbox’s new two-step authentication, I skimped on the cryptography. Because we had to move quickly, I wanted to focus at the time just on our recommendations, so I told a few fibs about how the way the six digit codes “get” to your phone. Now I want to explain how it really works.

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  • Alan Turing’s contribution can’t be computed

    SECURITY

    Alan Turing’s contribution can’t be computed

    Jeffrey Goldberg by Jeffrey Goldberg Dec 8, 2012

    Alan Turing was born a hundred years ago this year and his most important paper was published seventy-six years ago (November 1936). It is close to impossible to overstate the influence that Turing has had on the modern world. It is something well worth celebrating his life throughout this centennial year. Although any celebration must be tempered …

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  • Hashing fast and slow: GPUs and 1Password

    SECURITY

    Hashing fast and slow: GPUs and 1Password

    Jeffrey Goldberg by Jeffrey Goldberg Dec 5, 2012

    The net is atwitter with discussion of Jeremi Gosney’s specially crafted machine with 25 GPUs that can test hundreds of billions of passwords per second using hashcat, a password cracking system. Password crackers, like hashcat, look at the cryptographic hashes of user passwords and repeatedly make guesses to try to find a password that works. …

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  • Don’t trust a password management system you design yourself!

    SECURITY

    Don’t trust a password management system you design yourself!

    Jeffrey Goldberg by Jeffrey Goldberg Nov 8, 2012

    Nicole Perlroth of The New York Times penned an article on “How to Devise Passwords That Drive Hackers Away“. The article has a typical mixture of good advice that could often be better, along with some implied advice that I actually consider very poor.

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  • Credit card numbers checksums and hashes, the story of a scamming attempt

    SECURITY

    Credit card numbers checksums and hashes, the story of a scamming attempt

    Jeffrey Goldberg by Jeffrey Goldberg Oct 18, 2012

    As Lívia and I were out walking Molly and Patty on Monday evening, I received a telephone call from an unknown number.

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