Question: the xor process is used in which cipher
[{'answer': 'additive', 'provenance': [{'wikipedia_id': '939985', 'title': 'XOR cipher', 'start_paragraph_id': 1, 'start_character': 53, 'end_paragraph_id': 1, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '939985', 'title': 'XOR cipher', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 136, 'bleu_score': 0.9067110266941041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11279834305164774049}, 'section': 'Section::::Abstract.'}]}]