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The following text is encrypted with its own key.

Ip;g siyyiu el ytaik pl ej ygi dit el auillik =eyg pb zaazleyi jebhiuC

A hint for those that want it:

The entire solution is a syntactically valid English sentence (barring any mistakes from the manual encryption).

Second hint:

It has something to do with your computer. This method is the same as the way most people on here write it, at least for the most part, since my native tongue is not English. There is a 1 to 1 direct match between letters in the solution and in the encrypted text.

How did I encrypt this and what is the solution?

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    $\begingroup$ Are you absolutely certain this possible to answer with just the information provided? $\endgroup$ – Aza Nov 20 '14 at 8:36
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    $\begingroup$ I believe so. It might require some thinking. I'll add another hint, since I just realized that my situation is probably slightly different from most people on her (English is not my native language). There have been puzzles of a similar type before, but not as complicated. $\endgroup$ – Nzall Nov 20 '14 at 8:48
  • $\begingroup$ Is it horizontal mirroring of the keyboard ? $\endgroup$ – v kumar Nov 20 '14 at 9:33
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    $\begingroup$ Yes it is. now, use this to translate the message. $\endgroup$ – Nzall Nov 20 '14 at 9:34
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I manually deciphered it as a hinted symmetrical substitution cipher

Each letter is typed as if the key is pressed with an opposite finger.

remark:

Mark that the "." would be a ":" on most(?) keyboards, if I were to guess, your keyboard has the "." and the ";" on the same key. Mine has an ":" when I press SHIFT+";"

Yes, after checking images of an AZERTY keyboard, my suspicion is confirmed. Interestingly, those who see the "trick" may be put off by some letters being in non-standard positions for QWERTY-users.

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  • $\begingroup$ I use an Azerty keyboard, so yes, the . and ; are on the same key. You are correct, and you are the first one to have given the complete answer in full. Mew already started to answer, but he was later than you with a completely correct answer. $\endgroup$ – Nzall Nov 20 '14 at 9:36
  • $\begingroup$ @Mew: your answer was started earlier, but you didn't have the complete mesage before oerkelens answered with it. $\endgroup$ – Nzall Nov 20 '14 at 9:38
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    $\begingroup$ I have decided to delete my solution to make the process easier. $\endgroup$ – Kenshin Nov 20 '14 at 9:47
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    $\begingroup$ Actually, you both have the same mistake, you and @Mew. The colon should be a period, since that's typed with shift and right middle finger on an Azerty keyboard (which is capital C with shift and left middle finger). If you edit that, I'll accept it. might be pedantic, but I'd rather do this properly. $\endgroup$ – Nzall Nov 20 '14 at 9:47
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    $\begingroup$ Nothing wrong with being pedantic :) $\endgroup$ – oerkelens Nov 20 '14 at 10:18

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