%% You should probably cite rfc6617 instead of this I-D.
@techreport{harkins-ipsecme-spsk-auth-07,
    number =    {draft-harkins-ipsecme-spsk-auth-07},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-harkins-ipsecme-spsk-auth/07/},
    author =    {Dan Harkins},
    title =     {{Secure PSK Authentication for IKE}},
    pagetotal = 22,
    year =      2012,
    month =     mar,
    day =       9,
    abstract =  {This memo describes a secure pre-shared key authentication method for IKE. It is resistant to dictionary attack and retains security even when used with weak pre-shared keys.},
}