Encryption of low data content ATM cells

Details Encryption of low data content ATM cells Encryption of low data content ATM cells

1995-09-15

1997-06-24

Tarcza, Thomas H.

Cryptography

Key management

Having particular key generator

380 9, H04L 900

Patent

active

056424213

ABSTRACT:
The security provided by encryption of ATM cells is enhanced by testing each cell for low data content level. If a cell has a low data content, its contents are nevertheless compressed and the resulting string is used to replace the original data. A length character and a randomly generated number which are added to the freed-up byte positions in the data field of the cell. The entire, modified data field is encrypted before the cell is transmitted. At a receiving system, a compression indicator is checked to determine whether the cell contains original or compressed data. If necessary, the length field and the random number are stripped and the remaining cell data is decompressed before the cell data is decrypted.

REFERENCES:
patent: 5303302 (1994-04-01), Burrows
patent: 5410599 (1995-04-01), Crowley

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