1. A method comprising: receiving a set of trusted user accounts at a computing device; determining a trusted user account in the set of trusted user accounts that an untrusted user account is associated with by the computing device; determining if a vouching quota associated with the determined trusted user account is greater than a vouching cost by the computing device; and if it is determined that the vouching quota is greater than the vouching cost, generating an indicator vouching for the untrusted user account by the computing device.