Variable mask for encryption generated independently at communic

Details Variable mask for encryption generated independently at communic Variable mask for encryption generated independently at communic

1996-08-13

1999-10-12

Laufer, Pinchus M.

Cryptography

Key management

Having particular key generator

380 6, 380 9, 380 46, 380 23, 455410, H04L 916

Patent

active

059664509

ABSTRACT:
Frames of data are encrypted by combining each of the frames with a mask that varies from frame to frame. The mask is obtained by using a frame counter as the seed for a pseudo random number generator, generating n pseudo random numbers, where n is the number of bytes to be encrypted in each frame, and concatenating the most significant bytes of each of the n pseudo random numbers to form the mask. The encrypted frames are transmitted, received and decrypted by combining them with the mask, which is independently generated at the receiver. The frame counter is aperiodically reset to a new initial value that is a substantially random number with respect to a previous initial value.

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