Decrypting Text

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Affine cipher decryption

Many ciphers are automated and rely on a mathematical encryption algorithm. One common class of letter shift ciphers is known as the affine shift cipher. It uses the form x -> 3x + 5 where the numbers can vary. The aim is that by knowing the letter substitutions for 2 letters then we can solve the 2 simultaneous equations. However, this means division in modulus maths - which may not be possible if a multiplicative inverse cannot be found. So you may need to try a few characters before this works.

The box below contains example encrypted text. You can paste the text that you want to decipher over this example text. Then fill in your replacement letters.

Enter your ciphertext below: vlwtf grakt zpxsa tddkf dhsqp gvtwv takfa aktmy fsdkf utwhd fmmtf gtwfs wakfa lpxfg tpsak thgag fhyqg pvwhd zgtta tsjxh ghtdr hakkt gdpzh talqg htswd hsakt qpgth nspqq hztha fmmtf gdakf aaktg pnxtd mhpsk fdzps afzat wqgts zkfnt sadkh dqyhn kaapd pxakf vmaps vhnka vtfsa kfakt myfsd aptdz fmtcf zbapq gfszt hqpsy laktg trtgt mttyt gdhsd pxakf vmaps apfdd hdalp xhapz zxgda pvtak fafst ytzag hzaty tngfm khzwt uhztc fdtwp spxga xgshs nvfzk hstvh nkact xdtqx yhsak tfmmg tktsd hpspq dxzkg pnxtd hsakt qxaxg takpx nkwpx caytd dakhd tsnhs tvfhy fdhzf yyhar hyyct aktzf xdtpq vxzkh wytnp ddhma ppctd xgtak faakt gpnxt hdylh snypr fswlp xrhyy kfuta pctfd dhwxp xdhsl pxgts jxhgh tdhql pxfgt apqhs wkhva ktzpx satdd kfdbh swylm yfztw fsfwu tgahd tvtsa hsakt sfahp sfymg tdddk tkfdk hnkkp mtdak fahar hyylh tywst rfuts xtdpq tsjxh gllpx gdfdt utgzk fd   Enter your replacement letters in the boxes below:   1 2 encrypted DECRYPTED?

 

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