Abstract: A chaotic cryptographic technique for orthogonal frequency division multiplexing (OFDM) based wireless/wired communication systems is implemented with an OFDM symbol structure based on symmetric key cryptography. At the receiver side, data detection becomes infeasible without knowledge of the secret key. Without the knowledge of the key, the signal will be a noise-like signal. The computational power required to implement the technique is very low, rendering the system an attractive option for high data rate communications based on OFDM technology. The system security is proportional to (L×N)! where N is the number of subcarriers in the OFDM system and L is the number of OFDM symbols involved in the encryption process. For OFDM applications where ?256, L may be set to 1 and breaking the system would require N! exhaustive-search trials. In the case that N<256, L may be increased.

Abstract: A chaotic cryptographic technique for orthogonal frequency division multiplexing (OFDM) based wireless/wired communication systems is implemented with an OFDM symbol structure based on symmetric key cryptography. At the receiver side, data detection becomes infeasible without knowledge of the secret key. Without the knowledge of the key, the signal will be a noise-like signal. The computational power required to implement the technique is very low, rendering the system an attractive option for high data rate communications based on OFDM technology. The system security is proportional to (L×N)! where N is the number of subcarriers in the OFDM system and L is the number of OFDM symbols involved in the encryption process. For OFDM applications where ?256, L may be set to 1 and breaking the system would require N! exhaustive-search trials. In the case that N<256, L may be increased.

Abstract: Gaining secure access to a ubiquitous network by detecting a user joining one particular network domain of the ubiquitous network, authenticating the joined user by employing symmetric key authentication together with a single sign-on mechanism, and allowing the authenticated user to access one or more other network domains of the ubiquitous network based upon the authenticating for the one particular network domain.

Abstract: This invention generally relates to methods, apparatus and computer program code for secure communication links, in particular where accountability is required.

Abstract: This invention generally relates to methods, systems and computer program code for flexible but secure delegation, particularly where a chain of accountability is required in a system where trust is delegated.

Abstract: This invention generally relates to secure communications links for data transmission and more particularly relates to data communications links in which asymmetric cryptographic techniques are used to establish a secure link using symmetric cryptography.

Abstract: This invention generally relates to secure communications links for data transmission and more particularly relates to data communications links in which asymmetric cryptographic techniques are used to establish a secure link using symmetric cryptography.