H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 9/18 (2006.01) H04K 1/02 (2006.01) H04L 9/12 (2006.01)
Patent
CA 2248445
A method of decrypting data comprising encrypting bit-wise data, using a first plural bit mask, modulating the data into symbol format, and transmitting the symbol format data to a receiving apparatus, in a receiving apparatus, rotating a current received symbol sample by an amount equal to one of (i) its difference in phase from an immediately preceding received symbol sample toward the phase of the immediately preceding received symbol sample phase, and (ii) by an amount equal to estimated carrier phase towards zero phase, generating a second bit mask subset derived from values of the first bit mask, comprising plural bits for each symbol, reflecting the rotated symbol by a phase defined by the plural bits to form a symbol which is devoid of encryption, and providing the symbol devoid of encryption to a soft-decision decoder.
Méthode de décryptage de données cryptées au niveau du bit, comprenant ce qui suit : utiliser un premier masque à plusieurs bits; moduler les données sous forme de symboles puis les transmettre vers un dispositif récepteur; appliquer à un échantillon de symbole reçu un déphasage d'une valeur équivalant soit (i) à sa différence de phase par rapport à un échantillon de symbole reçu immédiatement avant, vers la phase de ce dernier échantillon, (ii) soit à la phase de la porteuse estimée, vers le déphasage nul; générer un deuxième masque à partir des valeurs du premier masque, comprenant plusieurs bits pour chaque symbole; refléter le déphasage produit afin d'obtenir un symbole non crypté; et transmettre le symbole non crypté à un décodeur à décision pondérée.
Hui Yan
Mann Karl D.
Borden Ladner Gervais Llp
Nortel Networks Limited
Northern Telecom Limited
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