Schneier: Man-in-the-Middle Attacks Against SSL

    Date13 Apr 2010
    CategoryCryptography
    4707
    Posted ByDave Wreski
    Here is a very technical discussion of some issues involved with intercepting communications in an SSL tunnel without breaking the encryption, and how it could be used by a federal government to wiretap on citizens.. Says Matt Blaze:
    A decade ago, I observed that commercial certificate authorities protect you from anyone from whom they are unwilling to take money. That turns out to be wrong; they don't even do that much.
    Scary research by Christopher Soghoian and Sid Stamm:
    Abstract: This paper introduces a new attack, the compelled certificate creation attack, in which government agencies compel a certificate authority to issue false SSL certificates that are then used by intelligence agencies to covertly intercept and hijack individuals' secure Web-based communications. We reveal alarming evidence that suggests that this attack is in active use. Finally, we introduce a lightweight browser add-on that detects and thwarts such attacks. Even more scary, Soghoian and Stamm found that hardware to perform this attack is being produced and sold:

    At a recent wiretapping convention, however, security researcher Chris Soghoian discovered that a small company was marketing internet spying boxes to the feds. The boxes were designed to intercept those communications -- without breaking the encryption -- by using forged security certificates, instead of the real ones that websites use to verify secure connections. To use the appliance, the government would need to acquire a forged certificate from any one of more than 100 trusted Certificate Authorities.

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