Layered session data unit frame

Details Layered session data unit frame Layered session data unit frame

1991-05-30

1992-09-15

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 49, H04K 100

Patent

active

051484820

ABSTRACT:
A layered session data unit frame (300) is provided wherein a first frame (200), designated a session data unit("SDU"), containing user information (209), a link control field (205) and an encryption field (207), is divided into a plurality of smaller frames (321, 323), each having an information field and designated a link data unit("LDU"). According to the invention, the SDU user information (209) is allocated into the information fields (211, 213) of the plurality of LDU's. The SDU link control field (205) is divided into a plurality of sub-fields and imbedded into the information fields of a first group of LDU's. The SDU encryption field (207) is divided into a plurality of sub-fields and imbedded into the information fields of a second group of LDU's. The sub-fields may be distributed throughout the LDU's in a generally uniform fashion. For instance, where the user information comprises coded voice words, the sub-fields may be separated by 30 msec words such that voice may be produced during the transmission of the field without any audio delay.

REFERENCES:
patent: 4941176 (1990-07-01), Matyas et al.

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