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Shifrimet me perkembim

Shifrimet me perkembim.

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Shifrimet me perkembim

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  1. Shifrimet me perkembim Ne kriptosistemet e deritashmejemimarre me zevendesime: karakteret e tekstittehapurjanezevendesuar me karaktere (tendryshem) tetekstitteshifrimit. Gjateshifrimit me njekriptosistem me perkembim, karakteret e tekstittehapurmbetentepandryshuar, atovetemrirenditensipasnjeperkembimitepozicionevetetyre. Njeshifer e tille fare e thjeshteeshtenjeteknikesipas se cilestekstiihapurshkruhetsivargdiagonaleshdhepastajlexohennjeri pas tjetritrreshtat e perftuar. Per shembull, per teshifruartekstin "shitniaksionet e hekurudhave" me njeshifertetille, veprojmesi me poshte:

  2. Mesazhiishifruar do tejete: SINASOEEEUUHVHTIKINTHKRDAE Duketsa e lehteeshtetethyhetnjeshifer e tille. Njeshifer me e komplikuar do teqeshkrimiimesazhit ne njedrejtkendesh, rresht pas rreshti, e duke ilexuar me pas shtyllat e tij, terenditurasipasnjeperkembimiteparacaktuar e tembajturtefshehte. Per shernbull, duke renditurshtyllat e matrices :

  3. sipasperkembimit∏ = (34152) marrimmatricen: qe, e lexuarsipasrreshtave, jeptekstin e shifruar: IEPMDDTEEIHRRTAEIIRM

  4. Kjoshiferbehetshume me e veshtire per tudeshifruarneqofteseperdoretdisa here; praneqofteserezultatii mare shifrohetdhenje here, ikonsideruarsitekstihapur, me tenjejtenshifer, icilipastajshifrohetprape….

  5. Transpozicionet e renditt Caktohetnjenumurnatyrort dhenjeperkembim ∏i (1,2, ... t), ndahetmesazhiiteksittehapur P ne blloqe me gjatesit dhendajsecilitbllokzbatohet∏. Per shembull, ne qofte se t = 4 dhe∏ = (3421) mesazhi P=I SH/ITNI/ TE/ GJIT /HA / behet C= HIS / INIT / ET / TIGJ / HA Deshifrimikryhet me aneteperkembimitteanasjellte∏-1. Natyrisht, ketosistemejane me tesigurt se zevendesimete thjeshta, meqe, ndoneseruanshperndarjen e frekuencavetegermavetevecanta, aiprishstatistikatdyshe, treshe e terendeve me telartategjuhes se dhene. Zakonishtshifrimet me perkernbim e ato me zevendesimperdorentekombinuar, per me teperqenuk ka ndarjeteprere midis tyre, mundtetregohetqetranspozicionet e renditn janenjerastivecanteishifravete Hill-it

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