mykhal

  Romantic Cryptography, i.e. how to say "I love you" but only if the other person is going to say "me too"

  http://www.anagram.com/jcrap/Volume_7/

  $\Re(s) = \frac{1}{2}$ for all s where $\zeta(s) = 0$ and $0 < \Re(s) < 1$

    Test for CVE-2015-1793 (Alternate Chains Certificate Forgery)
   
    Chain is as follows:
   
    rootCA (self-signed)
      |
    interCA
      |
    subinterCA       subinterCA (self-signed)
      |                   |
    leaf ------------------
      |
    bad
   
    rootCA, interCA, subinterCA, subinterCA (ss) all have CA=TRUE
    leaf and bad have CA=FALSE
   
    subinterCA and subinterCA (ss) have the same subject name and keys
   
    interCA (but not rootCA) and subinterCA (ss) are in the trusted store
    (roots.pem)
    leaf and subinterCA are in the untrusted list (untrusted.pem)
    bad is the certificate being verified (bad.pem)
   
    Versions vulnerable to CVE-2015-1793 will fail to detect that leaf has
    CA=FALSE, and will therefore incorrectly verify bad

  *) Alternate chains certificate forgery

     During certificate verfification, OpenSSL will attempt to find an
     alternative certificate chain if the first attempt to build such a chain
     fails. An error in the implementation of this logic can mean that an
     attacker could cause certain checks on untrusted certificates to be
     bypassed, such as the CA flag, enabling them to use a valid leaf
     certificate to act as a CA and "issue" an invalid certificate.

     This issue was reported to OpenSSL by Adam Langley/David Benjamin
     (Google/BoringSSL).
     [Matt Caswell]

  $a = "DjBlYVWap4fQC8b3C73+NATPA2We"."c"."E+FNMAP+2WcTIdAzJQv6y2hFaP0F"."V"."y7hgdJc4ZlbX0fNKQgWdePWo3R7w";
  $b = "DjBlYVWap4fQC8b3C73+NATPA2We"."d"."E+FNMAP+2WcTIdAzJQv6y2hFaP0F"."d"."y7hgdJc4ZlbX0fNKQgWdePWo3R7w";
  var_dump($a === $b); // false
  var_dump(md5(base64_decode($a)) === md5(base64_decode($b))); // true