Abstract: Method for distributing a group session cryptographic key includes initiating at least one pairwise key distribution session including a root node (100) and at least one communication node (101-107). The method further includes performing at a communication node which has received the group session cryptographic key a propagated pairwise key distribution session with at least one of the communication nodes which has not previously received said group session cryptographic key. The propagated pairwise key distribution sessions are performed at each of the communication nodes which subsequently receives the group session cryptographic key until the group session cryptographic key has been securely provided to all authorized communication nodes.

Abstract: A secure processing device may include an external memory storing encrypted data, and a processor cooperating with the external memory. The processor is configured to generate address requests for the encrypted data in the external memory, cache keystreams based upon an encryption key, and generate decrypted plaintext based upon the cached keystreams and the encrypted data requested from the external memory. For example, the processor may be further configured to predict a future address request, and the future address request may be associated with a cached keystream.

Abstract: A secure processing device may include an external memory storing encrypted data, and a processor cooperating with the external memory. The processor is configured to generate address requests for the encrypted data in the external memory, cache keystreams based upon an encryption key, and generate decrypted plaintext based upon the cached keystreams and the encrypted data requested from the external memory. For example, the processor may be further configured to predict a future address request, and the future address request may be associated with a cached keystream.

Abstract: A method and apparatus for use in encrypting and decrypting digital communications converting an initial block to final block based on freely selectable control information and secret key information having double the length of prior art keys and maintaining compatibility with the prior art encryption system.

Abstract: A cryptographic device includes an input stage receiving an input data block and a key data block made up of a plurality of sub-key data blocks, and generating a plurality of first signals therefrom. An intermediate stage is connected to the input stage and includes a plurality of substitution units. Each substitution unit substitutes data within a respective first signal. A diffuser is connected to the plurality of substitution units for mixing data to generate a diffused signal. An output stage is connected to the intermediate stage for repetitively looping back the diffused signal to the input stage for combination with a next sub-key data block. The output stage provides an output signal for the cryptographic device after the repetitively looping back is complete.

Abstract: A method and apparatus for use in encrypting and decrypting digital communications converting an initial block to final block based on freely selectable control information and secret key information having double the length of prior art keys and maintaining compatibility with the prior art encryption system.

Abstract: A method and apparatus for use in encrypting and decrypting digital communications converting an initial block to final block based on freely selectable control information and secret key information having double the length of prior art keys and maintaining compatibility with the prior art encryption system.

Abstract: A block cipher device for a cryptographically secured digital communication system includes a pair of first stages connected in parallel for receiving an input data block and a control data block. Each first stage defines a respective first data path and includes a sum modulo-two unit for receiving the control data block and the input data block. Each first stage also includes a first nibble swap unit downstream from the sum modulo-two unit. A key scheduler generates a random key data block based upon a received key data block. A pair of second stages is connected in parallel downstream from the first stages and receives the random key data block, the control data block and output signals from the first stages for providing an output data block. Each second stage defines a respective second data path and includes a plurality of modulo units. The block cipher device further includes a bit diffuser connected in both of the first data paths for mixing data therebetween.

Abstract: Authentication and access control device (104) includes a first security key sub-system (110, 112, 114, 116, 118). The first security key sub-system is responsive to an input signal for providing a first key code required for permitting a user access to a controlled resource. The device advantageously can also include a second security key sub-system (110, 112, 114, 116, 118) for providing a second key code different from the first key code. The second key code can be for authenticating the user or can be otherwise useful for secure use of a particular controlled resource (102).

Abstract: A random number source includes a ring oscillator generating an internal clock signal having random phase noise, and a first linear feedback shift register connected to the ring oscillator. A counter is connected to a first tap of the first linear feedback shift register for generating a count signal. A feedback bit controller is connected to a second tap of the first linear feedback shift register for generating a random feedback bit for a time based upon the count signal. A second linear feedback shift register is connected to the feedback bit controller for generating a random number based upon the random feedback bit.

Abstract: A method and apparatus for use in encrypting and decrypting digital communications converting an initial block to final block based on freely selectable control information and secret key information having double the length of prior art keys and maintaining compatibility with the prior art encryption system.

Abstract: A wireless cryptographic fill system includes a fill device and a host portion. The fill device is configured to store one or more cryptographic keys and related data in memory therein. The host portion is coupled to a host processor, such as a secure radio configured to perform secure operations utilizing the cryptographic key. The fill device and the host portion are configured to communicate wirelessly with each other. Wireless communications may be accomplished optically, magnetically, inductively, capacitively, via radio frequency, or via bar codes. In one embodiment, the fill device is stylus-shaped, and is inserted into (or positioned proximate) the host portion to achieve wireless communications. In another embodiment, the cryptographic fill device is card shaped, and is inserted (or swiped) into a slot on the host portion to achieve wireless communications.

Abstract: A wireless cryptographic fill system includes a fill device and a host portion. The fill device is configured to store one or more cryptographic keys and related data in memory therein. The host portion is coupled to a host processor, such as a secure radio configured to perform secure operations utilizing the cryptographic key. The fill device and the host portion are configured to communicate wirelessly with each other. Wireless communications may be accomplished optically, magnetically, inductively, capacitively, via radio frequency, or via bar codes. In one embodiment, the fill device is stylus-shaped, and is inserted into (or positioned proximate) the host portion to achieve wireless communications. In another embodiment, the cryptographic fill device is card shaped, and is inserted (or swiped) into a slot on the host portion to achieve wireless communications.

Abstract: A method and apparatus for use in encrypting and decrypting digital communications converting an initial block to final block based on freely selectable control information and secret key information having double the length of prior art keys and maintaining compatibility with the prior art encryption system.

Abstract: A method and apparatus for use in encrypting and decrypting digital communications converting an initial block to final block based on freely selectable control information and secret key information. The apparatus or method having a plurality of units or steps operating on plain text or cipher text to provide a final block. The steps or methods including three modulo operations having unique modulus and meeting a specified constraint.

Abstract: A system and method for compressing speech using an artificial neural network to calculate the recoded phase vector (Mozer code) resulting from the spectral magnitude-to-phase transformation. Raw speech is equalized to remove the spectral tilt and segmented into analysis frames. The spectral magnitudes of each frame segment are determined at a plurality of points by a Fourier Transform, normalized, and applied to a neural net magnitude-to-phase transform calculator to provide a recoded phase vector. An Inverse Discrete Fourier Transform is used to calculate the new recoded speech waveform in which the two quarters with minimum power are zeroed to produce the compressed speech output signal.