4. Known plaintext attack on the Hill cipher. Oscar intercepted ciphertext4 and somehow obtained its decryption, plainte

[answerhappygod]

4. Known plaintext attack on the Hillcipher.Oscar intercepted ciphertext4 and somehow obtained its decryption,plaintext4. Find the key used in the encryption of this Hillcipher.
Ciphertext4:
OVGAJ VCQYG NEVLT HKFQL VPOKN WEYRB GELIL OOHAG POXAZKOLBX ARMZG XKSPK EDXJM GIKZK ZWIOX YYYYF JAEOB ZNDOS JZKHRBOHMD DTGSU XDRYV REIKS YWMVW YGJKC IVSVP CPWXV LQJAT SJWHEBNQBW QOWZP EGVMD PVEWI ROGUW XRXNK JUWNP IOQAJ AAHXB KJMHYUJTVN INYES ZHDJD JXGBG SGYBB LTCHM ASDUW XRXNB WFNUN MFKOVUTLRC DXDAY IDKPD HCENK HDTWJ LHAVQ BKHDT WJLHA VQBIM NMGUBOWMAO VPHUD ZAGQO YGWON LHALM TVVWT XWVVV GVMDP VEWIR OGQZFKXYOY MZGIA UGGRN UMGKB NQOIQ IPELK BWMEX ZCFBA FYEXY GBCRCFJOGI UIFMB ZNCYR YKFRB EQVJZ ALSYD BDSNV UBHDK JILHQ FXGTGKYZVB SPZMZ IHIPK RFACK BWAQZ CDQEG AWCUG PRXHB LCZKY UHFPXWBEAI LZZZW XOVGF ITWAN COYMZ GIAUG GRNUM GKBNQ OIQIP ELKBWMEXZC FBAFY EXYMU WGXQI URDVQ GVOSG YXZDM QSXYL TXMYP UMGRWWSTUO ZZRAE LEEUM OPZSH PABHR ZKSAF ZZWYE CFOCA PARIN EXNFTFBHQA NPVBB GTAUP OATAN GFJQL WWDAB IGROT SGAHO VSPME ONCIUFCMHR NKGPZ ULLJA HBGJM EQKGA GOVEV SMNIM HF
Plaintext4 (decryption of ciphertext4):
wheniwakeupearlyinthemorningliftmyheadimstillyawningwheniminthemiddleofadreamstayinbedfloatupstreamfloatupstreampleasedontwakemenodontshakemeleavemewhereiamimonlysleepingeverybodyseemstothinkimlazyidontmindithinktheyrecrazyrunningeverywhereatsuchaspeedtilltheyfindtheresnoneedtheresnoneedpleasedontspoilmydayimmilesawayandafterallimonlysleepingkeepinganeyeontheworldgoingbymywindowtakingmytimelyingthereandstaringattheceilingwaitingforasleepyfeelingpleasedontspoilmydayimmilesawayandafterallimonlysleepingoohyeahkeepinganeyeontheworldgoingbymywindowtakingmytimewheniwakeupearlyinthemorningliftmyheadimstillyawningwheniminthemiddleofadreamstayinbedfloatupstreamfloatupstreampleasedontwakemenodontshakemeleavemewhereiamimonlysleepingq