EP 2178235 B1 20111005 - Encryption of information signals
Title (en)
Encryption of information signals
Title (de)
Verschlüsselung von Informationssignalen
Title (fr)
Cryptage de signaux d'information
Publication
Application
Priority
EP 08390001 A 20081017
Abstract (en)
[origin: EP2178235A1] The invention relates to techniques for encrypting and decrypting information signals, for example digital voice signals in mobile communications, based on polyphase filter banks. A method embodiment of the invention for encrypting information signals comprises the steps of splitting, based on multiple analysis subband filters, an input information signal into a set of signal subbands; performing an encryption operation on one or more subbands of the set of subbands; and synthesizing, based on multiple synthesis subband filters, the encrypted set of subbands into an output information signal, wherein a particular synthesis filter is the product of all analysis filters except the analysis filter corresponding in subband to the particular synthesis filter.
IPC 8 full level
H04K 1/04 (2006.01)
CPC (source: EP)
H04K 1/04 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2178235 A1 20100421; EP 2178235 B1 20111005; AT E527768 T1 20111015; CY 1112183 T1 20151209
DOCDB simple family (application)
EP 08390001 A 20081017; AT 08390001 T 20081017; CY 111101254 T 20111216