ðə jˌuːˈɛs ˈɑːɹmiz ˌɛsˌaɪˈɛs bɹˈoʊk ˌɪntʊ ðə hˈaɪɪst lˈɛvəl dʒˌæpənˈiːz dˌɪpləmˈæɾɪk sˈaɪfɚ kˈɔːld pˈɜːpəl baɪ ðə jˌuːˈɛs wˈɛl bᵻfˌoːɹ ðɪ ɐtˈæk ˌɔn pˈɜːl hˈɑːɹbɚ.
The US Army's SIS broke into the highest level Japanese diplomatic cypher (called PURPLE by the US) well before the attack on Pearl Harbor.