well, when encrypting, I add the offset and decrypting=remove it.

can't say for the first one but:
The Vigenere cipher basic construction is a combination of a Caesar shift combined with a keyword

comes out as:
gZD QYyXP5ae WJhdVA F3dks FillEnZ6fl5j dr x KLbh2mGqjkB XD i EJewZI eIbpH NqscBrRF 88yT i Globl55

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