Importance

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Abstract

1. In an autokey code generator for use in secret communication systems, the combination of a source of cipher text code in pulse form; a source of reset pulses having a repetition period equal to the cipher text code interval; a dynamic pulse storage network including an input connected to said source of cipher test code, a plurality of stages connectable in sequence to step the pulses of said cipher text code along said sequence under control of said reset pulses; each said stage except the first having at least one output, matrix means having a plurality of inputs and a plurality of outputs for obtaining at any given instant a signal at one of said outputs, the particular one of said outputs at which said signal is present being dependent on the combination of voltage applied to said inputs, said inputs of said matrix means being respectively connected to said outputs of said stages; each said stage except the first having first and second gate means, said first gate means being connected to transfer the output of the preceding stage to the stage connected thereto, said second gate means being connected to supply reset pulses from said source of reset pulses to the stage individual to said second gate means; said outputs of said matrix means being divided into first and second groups; said outputs in said first group being connected together to form an autokey code output and said outputs in said second group being connected to individual ones of said first and second gate means for the control thereof, whereby the operation of said stages from said cipher text code fed into said input of said network is modified as determined by the signal configuration present at said outputs of said matrix means.

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First Claim