(c) Bonds may be secured by a trust agreement entered into by the department, which trust agreement may pledge or assign all or part of the monies credited to the fund and rights to receive the same, whether existing or coming into existence and whether held or thereafter acquired, and the proceeds thereof. The department may enter into additional security, insurance or other forms of credit enhancement which may be secured on a parity or subordinate basis with the bonds. A pledge in any such trust agreement or credit enhancement agreement shall be valid and binding from the time such pledge shall be made without any physical delivery or further act, and the lien of such pledge shall be valid and binding as against all parties having claims of any kind in tort, contract or otherwise, whether or not such parties have received notice thereof. Any such pledge shall be perfected by filing of the trust agreement or credit enhancement agreement in the records of the department, and no filing need be made pursuant to chapter 106. Any such trust agreement or credit enhancement agreement may establish provisions defining defaults and establishing remedies and other matters relating to the rights and security of the holders of the bonds or other secured parties as may be reasonable and proper, including provisions relating to the establishment of reserves, acceleration of maturities, restrictions on the individual right of action by bondholders and covenants setting forth the duties of and limitations on the department, and may regulate the custody, investment and application of monies.