Multipart Cipher

This is a two-part challenge. The answer for this challenge is the keyword used to successfully decipher part two. You could get stuck right into part two but solving part one will give you a big hint!

Part 1

Code:

HWNZX Z S NTASC NSLWWYR GCJSTYR HLD RZTYR RCL HSY HZCOD HC DAW NZCCNWJ LYO JZF NZFWO UFD OZ QCBFYNJ LYLWJDTD MF T NLY R L MT SLCOC HTSZF S HZ XZD NZXXZY WCD HSTWD T XTRS XLV S I L WTW MT XZC OTQQTNFW Z CLO QZC S CNTATY ZGCLWW JZF HZFWO SZA SL S CXZGLW ZQ SD HZ WCD HZFWO XLV ONTASCTYR S XDDLR L HSZW WZ SLCOC QZC S YIE NTASC S VJHCO WYRS TD QTG

Part 2

Code:

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