Block-cipher cryptographic system with chaining

Details Block-cipher cryptographic system with chaining Block-cipher cryptographic system with chaining

1976-04-26

1978-03-07

Engle, Samuel W.

Telegraphy

Systems

Printing

H04K 106, H04L 902

Patent

active

040781526

ABSTRACT:
A Block-Cipher Cryptographic System utilizing a unique user supplied key to control the cryptographic function and including means for modifying an input data block prior to performing a key-controlled transformation operation thereon. Said means includes means for extracting a segment of data utilized in a prior cryptographic transformation of the system and combining said segment with the input data block. The means for combining comprises a transformation which is a discrete valued function which in the preferred embodiment is an exclusive-or. In the preferred embodiment of the invention a block of ciphertext data is combined with the just succeeding input data block by an exclusive-or operation prior to the key-controlled transformation operation which produces said ciphertext blocks.
A means for detecting and cryptographically transforming short blocks of data is also disclosed wherein an input short data block is combined in a mathematically invertible operation with a block of data which is passed through said key-controlled block cipher cryptographic subsystem prior to said combination. The so transformed short block is then output as a short block in cryptographically modified form.

REFERENCES:
patent: 3657699 (1972-04-01), Rochen et al.
patent: 3740475 (1973-06-01), Ehrat
patent: 3798359 (1974-04-01), Feistel
patent: 3798360 (1974-04-01), Feistel
patent: 3911216 (1975-10-01), Bartek et al.

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