Abstract: A digital processing method, which comprises obtaining a stream of N-bit input data words; obtaining a value k between 0 and M?1, inclusively, where M>1; processing each of the N-bit input data words at least based on the kth of M permutation elements to produce a corresponding N-bit output data word; and outputting a stream of N-bit output data words on a network or storing the stream of the N-bit output data words in a non-transitory storage medium.

Abstract: A digital communication method over an optical channel. Bob modulates a coherent optical signal with a random envelope phase ?r, known to him and not to Alice, and transmits the modulated coherent optical signal (envelope) over the optical channel to Alice. Alice further modulates the envelope with a key phase ?k, based on a secret key and a selected modulation scheme, to create a cipher envelope, and sends the cipher envelope towards Bob along the optical channel. Bob then demodulates a received version of the cipher envelope by removing the random envelope phase ?r (known to Bob) and then measures the phase of the resulting demodulated coherent optical signal with the coherent detector to extract, to within a certain margin of error, the key phase ?k, from which Alice's secret key can be decoded. Bob then uses the secret key for encrypting messages sent to Alice over any digital network.

Abstract: A digital communication method over an optical channel. Bob modulates a coherent optical signal with a random envelope phase ?r, known to him and not to Alice, and transmits the modulated coherent optical signal (envelope) over the optical channel to Alice. Alice further modulates the envelope with a key phase ?k, based on a secret key and a selected modulation scheme, to create a cipher envelope, and sends the cipher envelope towards Bob along the optical channel. Bob then demodulates a received version of the cipher envelope by removing the random envelope phase ?r (known to Bob) and then measures the phase of the resulting demodulated coherent optical signal with the coherent detector to extract, to within a certain margin of error, the key phase ?k, from which Alice's secret key can be decoded. Bob then uses the secret key for encrypting messages sent to Alice over any digital network.

Abstract: A digital processing method, which comprises obtaining a stream of N-bit input data words; obtaining a value k between 0 and M?1, inclusively, where M>1; processing each of the N-bit input data words at least based on the kth of M permutation elements to produce a corresponding N-bit output data word; and outputting a stream of N-bit output data words on a network or storing the stream of the N-bit output data words in a non-transitory storage medium.

Abstract: A digital processing method, which comprises obtaining a stream of N-bit input data words; obtaining a value k between 0 and M?1, inclusively, where M>1; processing each of the N-bit input data words at least based on the kth of M permutation elements to produce a corresponding N-bit output data word; and outputting a stream of N-bit output data words on a network or storing the stream of the N-bit output data words in a non-transitory storage medium.

Abstract: A method and system for automatically generating a new password from user selected characters via key press which are different from the user selected characters. Each key of a keypad can be entered within one or more contexts, manually selected by the user or automatically selected by the described system, such that the same key press within one context provides a unique code different than the same key press within another context. The code corresponding to the proper combination of a key press, the contexts of the selected key press, and the sequence of entry must match the previously stored code set by the user. Context selection is not based on any of the possible key presses selectable on the keypad. Therefore if the password characters are discovered without the context for each character, then it becomes difficult to access the content. The newly generated password can be the same length as the originally entered password, or can be longer or shorter in length than the originally entered password.

Abstract: A method and system for automatically generating a new password from user selected characters via key press which are different from the user selected characters. Each key of a keypad can be entered within one or more contexts, manually selected by the user or automatically selected by the described system, such that the same key press within one context provides a unique code different than the same key press within another context. The code corresponding to the proper combination of a key press, the contexts of the selected key press, and the sequence of entry must match the previously stored code set by the user. Context selection is not based on any of the possible key presses selectable on the keypad. Therefore if the password characters are discovered without the context for each character, then it becomes difficult to access the content. The newly generated password can be the same length as the originally entered password, or can be longer or shorter in length than the originally entered password.