Manabu Hagiwara Takahiro Yoshida Hideki Imai Bounds on the Number of Users for Random 2-Secure Codes. 239-242 2009 AAECC http://dx.doi.org/10.1007/978-3-642-02181-7_29 conf/aaecc/2009 db/conf/aaecc/aaecc2009.html#HagiwaraYI09