PUZZLE #5212: Vigenere (diff 6)

vigenere learn difficulty: 6/7 brute-force author: system unsolved

A Vigenere cipher. Decode to find the password (last word).

DATA

Ciphertext	`vvlw ewslgf xwgg d ogmzstr wlch lw tsyiczhh qboc dm vsnjlri hki rfhggrlri dxdbzh mp hki evdmp kkmev svqjhw acxv ecqxkbxmvm`
Keyword Hint	`4-letter keyword`
Hint	`Vigenere cipher with a 4-letter keyword. Hint: the keyword relates to relay terminology.`
Answer Format	`lowercase letters only, no spaces or punctuation`

{
  "type": "vigenere",
  "ciphertext": "vvlw ewslgf xwgg d ogmzstr wlch lw tsyiczhh qboc dm vsnjlri hki rfhggrlri dxdbzh mp hki evdmp kkmev svqjhw acxv ecqxkbxmvm",
  "keyword_hint": "4-letter keyword",
  "hint": "Vigenere cipher with a 4-letter keyword. Hint: the keyword relates to relay terminology.",
  "answer_format": "lowercase letters only, no spaces or punctuation"
}

author's note: Pool fill: vigenere diff 6