Abstract: A method and system for performing digital message encryption and signature encoding for use in, for example, communications and digital information storage systems, For secure communication of digital messages it is necessary to both encrypt the message and sign the message with a digital signature scheme to allow for authentication by the receiver. In order to the computational efficiency and reduce communications overhead in secure communications, a method and system, referred to as “signcryption”, are provided in which the processes of encryption and authentication are combined. The principles of public key cryptography are utilised, although any suitable keyed encryption algorithm can be employed for the message encoding. Examples of signature schemes which can be easily implemented by signcryption include the ElGamal, Schnorr and Digital Signature Standard.

Abstract: This invention uses a plurality of inflatable bladders to support a surfboard or other balancing platform or sport board. The bladders are inflated with a gas or liquid, and as such, provide a fluid medium on which to seat a surfboard. This type of support system provides a sensation similar to that of water. This type of support system also allows for adjustments in the stability of the balancing platform. When used with a surfboard, snowboard, or other delicate standing platform, this type of support system evenly distributes the user's weight-load across a large area of the surfboard, snowboard, or other delicate platform so that it is not damaged.