ZNKIGKYGXIOVNKXOYGXKGRREURJIOVNKXCNOINOYXKGRRECKGQOSTUZYAXKNUCURJHKIGAYKOSZUURGFEZURUUQGZZNKCOQOVGMKGZZNKSUSKTZHAZOLOMAXKOZYMUZZUHKGZRKGYZROQKLOLZEEKGXYURJUXCNGZKBKXBGPJADLIVBAYKZNUYKRGYZZKTINGXGIZKXYGYZNKYURAZOUT

Test Vector

PT: HELLOWORLD
KEY: B
CT: IFMMPXPSME

Solution