Crack a monoalphabetic cypher

crack.py

ORDERED_ENGLISH = [c for c in "ETAOINSHRDLCUMWFGYPBVKJXQZ"]

# Dict mapping cypher letter to decrypted letter. Was empty in the beginning.
# Built up piece by piece, first by finding the H between T's and E's to create the
# words "the", "then", "them", "their". Confirmed "PYH" -> "THE".
# Noticed garbled form of the word "sincerity" in the middle of the text. Added
# mappings to fix it. Confirmed "AO" -> "RI".
# Text started to take shape. Noticed lots of garbled "of"s across the text.
# Added "L" -> "O". Also added "Z" -> "W" to fix "whatever".
known = {
        'H': 'E',
        'Y': 'H',
        'A': 'R',
        'O': 'I',
        'L': 'O',
        'Z': 'W',
        'R': 'F',
        'B': 'Y',
        'E': 'P',
        'D': 'B',
        'S': 'J',
        'X': 'U', 
        'T': 'C',
        'C': 'L',
        'K': 'Q',
}

with open('text.in', 'r') as f:
    CYPHER_TEXT = f.read().strip()
    ORDERED_CYPHER = sorted(ORDERED_ENGLISH, key=lambda x: CYPHER_TEXT.count(x), reverse=True)
print(CYPHER_TEXT)

d = {}
values = set()
for k in known:
    d[k] = known[k]
    values.add(known[k])

i = 0
j = 0
while i < 26 and j < 26:
    english = ORDERED_ENGLISH[i]
    cypher = ORDERED_CYPHER[j]
    while english in values:
        i += 1
        english = ORDERED_ENGLISH[i]
    while cypher in d:
        j += 1
        cypher = ORDERED_CYPHER[j]
    d[cypher] = english

    i += 1
    j += 1
print(d)
print(''.join(d[c] for c in CYPHER_TEXT))

text.in

YHAHKXHIPHJPLMGLZORVUHHPOGNLRPYHEHLECHDBPYHOAJHEXPOHIZLXCJDHEHAUOPPHJDBPYHVAUBVPVGBNOFHGELOGPLGPYHOAUVATYOGPLPYVPTLXGPABZOPYRAHIYHFOJHGTHLRPYHIOGTHAOPBLRPYHOAJOIELIOPOLGPLVTKXOHITHOGZYVPHFHAUONYPDHAHKXOAHJOAHECOHJOIVZGLLDSHTPOLGPLOPEALFOJHJPYHBTVUHXGVAUHJDXPPLDHTVXPOLXIPYVPGLPVNXGZVIROAHJVIPYHAHTLXCJDHGLVGIZHAOGNRLATLGIHKXHGTHIOGPYOITVIHOVIIXAHJPYHUPYVPHFHABELIIODCHTVAHIYLXCJDHPVMHGPLMHHEPYHPALLEIRALULRRHAOGNPYHUVGBOGIXCPLAJVUVNHVGJPYVPPYLIHZYLVCZVBIYVJDHHGIXDLAJOGVPHPLPYHCVZIIXTYVIYVJVFVOCHJPYHUIHCFHILRPYHVUGHIPBIYLXCJGLPDHOGSXAHJOGPYHOAEHAILGILAEALEHAPBVGJPYVPPYHPAHVPUHGPLRPYHAHIPZLXCJJHEHGJXELGPYHOALZGTLGJXTPPYVPPYHVAUBXGCHIILEELIHJJOJGLPUHVGPLVTPVIHWHTXPOLGHAILADAOGNLRRHGJHAIPLVUOCOPVABPAODXGVCDXPUHAHCBPLVOJPYHTOFOCUVNOIPAVPHIZOPYZYLULRRHGTHIZLXCJCBHPYXIHGJIPYHUVPPHA

text.out

HEREQUESTEDTOKNOWIFAMEETINGOFTHEPEOPLEBYTHEIRDEPUTIESWOULDBEPERMITTEDBYTHEARMYATANYGIVENPOINTONTHEIRMARCHINTOTHATCOUNTRYWITHFRESHEVIDENCEOFTHESINCERITYOFTHEIRDISPOSITIONTOACQUIESCEINWHATEVERMIGHTBEREQUIREDIREPLIEDISAWNOOBJECTIONTOITPROVIDEDTHEYCAMEUNARMEDBUTTOBECAUTIOUSTHATNOTAGUNWASFIREDASTHERECOULDBENOANSWERINGFORCONSEQUENCESINTHISCASEIASSUREDTHEMTHATEVERYPOSSIBLECARESHOULDBETAKENTOKEEPTHETROOPSFROMOFFERINGTHEMANYINSULTORDAMAGEANDTHATTHOSEWHOALWAYSHADBEENSUBORDINATETOTHELAWSSUCHASHADAVAILEDTHEMSELVESOFTHEAMNESTYSHOULDNOTBEINJUREDINTHEIRPERSONSORPROPERTYANDTHATTHETREATMENTOFTHERESTWOULDDEPENDUPONTHEIROWNCONDUCTTHATTHEARMYUNLESSOPPOSEDDIDNOTMEANTOACTASEXECUTIONERSORBRINGOFFENDERSTOAMILITARYTRIBUNALBUTMERELYTOAIDTHECIVILMAGISTRATESWITHWHOMOFFENCESWOULDLYETHUSENDSTHEMATTER

- quote from President Washington's Diaries 1791-1799