The term existential quantifier is identified in base64 scheme by the sequence ZXhpc3RlbnRpYWwgcXVhbnRpZmllcg==, while the MD5 signature is equal to 845a0b4ae41d6bb33fd3a33d2d13e902. The ASCII encoding of existential quantifier in hexadecimal notation is 6578697374656e7469616c207175616e746966696572.