EP 1016240 A1 20000705 - IMPROVED BLOCK CIPHER METHOD
Title (en)
IMPROVED BLOCK CIPHER METHOD
Title (de)
VERFAHREN ZUR VERBESSERTEN BLOCKVERSCHLÜSSELUNG
Title (fr)
PROCEDE DE CHIFFREMENT BLOC AMELIORE
Publication
Application
Priority
- US 9819255 W 19980916
- US 5914297 P 19970917
- US 6299297 P 19971023
- US 6433197 P 19971030
Abstract (en)
[origin: WO9914889A1] A data encryption system for encrypting an n-bit block (110) of input in a plurality of rounds is presented, where n is preferably 128 bits or more. The data encryption system includes a computing unit for the execution of each round; memory for storing and loading segments by predetermined numbers of bits preferably to achieve active and effective fixed rotation; a linear combination function (132) which provides new one-to-one round segments using a round operator generally from one algebraic group to combine two different one-to-one round segments taken from one-to-one round segment set; and a nonlinear function which affects a one-to-one round segment from a particular one-to-one round segment set based on a value which depends on a preselected number of bits in a preselected location from a different one-to-one round segment from the same one-to-one round segment set. The nonlinear function is a variable rotation function or an s-box. A subkey (130) combining function is generally employed in each round to provide new round segments by combining a round segment typically linearly with a subkey segment.
IPC 1-7
IPC 8 full level
H04L 9/06 (2006.01)
CPC (source: EP)
H04L 9/0625 (2013.01); H04L 9/50 (2022.05); H04L 2209/046 (2013.01); H04L 2209/125 (2013.01); H04L 2209/24 (2013.01)
Citation (search report)
See references of WO 9914889A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9914889 A1 19990325; AU 9569098 A 19990405; EP 1016240 A1 20000705
DOCDB simple family (application)
US 9819255 W 19980916; AU 9569098 A 19980916; EP 98949350 A 19980916