1 / 4

Frequency Analysis in Cryptography: Techniques and Applications

Frequency analysis in cryptography is a method of decrypting coded text by analyzing the frequency of symbols and patterns. By identifying common elements and applying specific techniques, such as the Playfair cipher, coded messages can be decoded with precision. This approach aids cryptanalysts in breaking encryption and understanding encrypted information effectively. By examining symbol frequencies and their patterns, insights can be gained into encrypted texts. Explore the techniques and tools used in frequency analysis for cryptography in this in-depth guide.

emera
Download Presentation

Frequency Analysis in Cryptography: Techniques and Applications

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Barazimiifrekuencave Frekuencat e njetekstiteshifruarmundtebarazohen duke icaktuarnjegermetetekstittehapurjoveternnjesimboltetekstitteshifruar, pornjebashkesisimbolesh, numriitecilevetejetenjerrumbullakosje e frekuences se germes, Natyrisht, atobashkesiduhettejenejoprerese, qepasqyrimiindertuarterezultojeinjektiv. Per teshifruarnjegermetedhene, zgjidhet ne menyreterastitnjeringasimbolet e bashkesise. Ne ketemenyrefrekuenca e simboleve ne teksin e shifruarhomogjenizohet, duke e beremjaftteveshtirekriptoanalizen, Porjotepamundur; meqendonesefrekuenca e germavetevecantahomogjenizohet, frekuenca e ciftevetegerrnaveruhet. Per shembull, ne qofte se germest ieshtevene ne korrespondencebashkesiaprej 10 elementesh {91, 32, 21, 14, 13,24,15,27,99, 37}, ndersagermesibashkesiaprej 7 elementesh {48, 61, 67,12,17,29, 45}, njefrekuence e larte e cifteveqekaneelementin e pare ngabashkesia e pare dhetedytin ne bashkesine e dyte do teshtyntekriptoanalistintedyshonteqetuvinte ne korrespontenceatyreciftin(t, i).

  2. Zevendesimetn-she Per territurforcenndajsulmevestatistikore, ne vend qetezevendesohengerma, mundtezevendesohencifteterenditurasyresh, apotreshe, etj. Njezevendesimdysh, pershembull, qe do tejetenjeperkembimi 262 = 676 dysheve, do teketenjecelesqemundteparaqitetnganjematricekatrore 26 x 26, kurreshtatitakojnegermes se pare tedyshes, shtyllattedytes, kurseelementet e matrices do jenezevendesuesit e dyshes. Njengashifrat me tenjohura me zevendesimdysheshteShifraPlayfair, qeperdorteashtuquajturitkatrorete Polybius-it. Germat e alfabetitrenditen ne katrore 5 x 5 (kuI= J), zakonishttefilluar me njefjalekod (ALGEBRA ne shembullin e meposhtem): Tekstiqe do teshifrohetndahet ne digrafe. Atykutakohendygermatenjejta, futetndermjettyrenjegermetjeter e caktuarqe me pare. Shifrimiinjedigrafikryhetsipasrregullave: Ne qofte se dygermat e digrafitnukjane ne tenjejtinrresht [shtylle] ne katrorin e Polybius-it tezgjedhur, shifrohenato me germatqendodhen ne dykulmet e tjeratedrejtkendeshitqeatoformojne, duke perdorur germen ne tenjejtinrreshtsi germen e pare tetekstittehapur. Ne qofte se tedygermat e digrafitjane ne tenjejtinrresht, zevendesohetsecilaprejtyre me germen fqinjetedjathtetesaj ne katrorin e Polybius-it tezgjedhur. Neqofte se tedygermat e digrafitjane ne tenjejtenshtylle, zevendesohetsecilaprejtyre me germen fqinjeposhtesaj ne katrorin e Polybius-it tezgjedhur. Rreshti [shtylla] e pare konsiderohetposhte [ne tedjathte] tegjithe[a] rreshtave [shtyllave] tekatrorit.

  3. ShembullTe shifrojmetekstin: E DI SHIFREN PLAY­FAIR me katrorin e dhene. Duke zbatuarrregullin1 tetreguarverejmeqeciftiipare ED shifrohet GF, ciftiidyte IS beheiMP, itreti HI behetRO. Dygermat e dyshes se rradhes F R ndodhen ne tenjejtinrresht, prandajaio do teshifrohen ne fqinjet e djathtetetyre: HC. Dytetjeret (EN) jane ne tenjejtenshtylle, prandajshifrohensi ne FT. Duke vazhduarkeshtumarrimtekstin e shifruar GFMP ROHC FTQA EVRE PI

  4. Shifra e Playfair-it per njekohetegjatekonsiderohej e pathyeshme, atojaneperdorursishifrastandardefushorengaushtriabritanikegjateLuftes se Pare BoteroredhekanepaturperdorirntegjerengaushtriaamerikanedheforcatetjeraaleategjateLuftes se DyteBoterore. • Deshifrimiperdorhapat e anasjellteteatyreteshifrimit. • UshtrimTe deshifrohettekstiimeposhtemme katrorin e dhene: ABOK LGAM BAAF KIBQ NYLY

More Related