Cipher Challenge

[Tiberius]

For anyone interested in cryptography, here is a cipher for you to solve if you have time.

PMXP WWZI YWDYF UQQUMD, CHC TEOM NVHSQR MPQ GHLQ EGL DIOMMPXL FLBA EIVZQX FMEWTOQ. THAF LHE KSN KDEVSQH BB UR MPQ XAZQEW JGX WW DIFMYFXZ FS ICF XAM ESECFMHV UR AQPI MISW LW KSN LA RHB DYBV UX YWD EGGARX MXWX. QR XAQE ML AGGVMEWYCX M PQXP UM BSLBURZ IZSMPQV VWPI BV M JXE IIXSE JHZ KSN BA XKG MRW AAPOM.

I might give some clues out if people want them

Good luck.

[Darwinian]

Before I waste my day on this, one question..

Is it a simple cypher where each letter simply represents another, no matter where it appears or is it more complex?

[Welsh cake]

I'll give it go, but my knowledge of deciphering ciphertext is woefully limited, so I'll have to research on internets first to see if you've borrowed from another system. If you've gone and devised your own algorithm then I'm screwed.

I just hope you haven't pulled a D'Agapeyeff on us.

[Anomalocaris]

Before I waste my day on this, one question..

Is it a simple cypher where each letter simply represents another, no matter where it appears or is it more complex?

I doubt it is a simple caesar cipher of an English original. I can"t think of anything in English whose caesar cipher would produce a word consisting of just two of the same letters.

[Tiberius]

Before I waste my day on this, one question..

Is it a simple cypher where each letter simply represents another, no matter where it appears or is it more complex?

It is more complex than that.

[chasm]

Encode or Decode? D:

[LastPoet]

Is it a vigenère cipher? O.O

[Tiberius]

I'm not confirming which cipher I used, but obviously it isn't a "modern" cipher.

[Tiberius]

Ok, so for those who are still stuck (I guess that is all of you), I'll give you a couple of clues that should help. The cipher is the Vigenère Cipher, and the key length is 4.

[Darwinian]

It was a tough assignment and I will accept your congratulations and multiple kudos now

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WELL DONE FORUM MEMBER, YOU HAVE BROKEN THE CODE AND REVEALED THIS SECRET MESSAGE. POST HOW YOU CRACKED IT IN THE THREAD BUT DO REMEMBER TO PUT THE SOLUTION IN HIDE TAGS SO YOU DO NOT RUIN IT FOR ANYONE ELSE. IF THIS IS SUCCESSFUL I WILL BE POSTING ANOTHER CODE IN A FEW WEEKS FOR YOU TO TRY AND SOLVE.

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The clue for me was the question asked in the first line of the O.P. Very clever Adrian.