Tag: decode

BlueHens CTF 2021: Minecraft: Mountain Climber

Posted on by gmk

Challenge Author: Izzy

For this challenge, we are given the following information and image:

Here is mc.png:

I stared at this once clueless until my son walked in and looked at the screen and just casually said “Get Blocked.”

I asked what he meant and he said “the names of the blocks… those are the first letters of each.

This was the flag:

UDCTF{GETBLOCKED}

BlueHens CTF 2021: Misc: Conway presents The Falcon

Posted on by gmk

This is from the BlueHensCTF 2021.

For this challenge, we are given the following hint and file:

golly.rle:

x = 2473, y = 1630, rule = B3/S23
2$
1406bo$
1407bo3bo$
1398b2o2b2o8bo12b2o$
1398b2o2bo5b2o2bo12b2o$
1402bobo5b2o$
1403b2o3b3o2$
1403b2o3b3o$
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1402bo5b2o2bo$
1402b2o8bo$
1407bo3bo$
1406bo2$
1435b2o$
1435b2o3$
1521bo$
1522bo3bo$
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1513b2o2bo5b2o2bo12b2o$
1428b3o3b3o80bobo5b2o$
1428bo2bobo2bo81b2o3b3o$
1427bo3bobo3bo$
1427b4o3b4o80b2o3b3o$
1428bo7bo80bobo5b2o$
1517bo5b2o2bo$
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1522bo3bo$
1521bo$
1427b$
1550b2o$
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1434b3o$
1433bo3bo$
1433b2ob2o77bobo10b2o106bo$
1433b2ob2o77b2o11bobo106bo3bo$
1516bo11bo99b2o2b2o8bo12b2o$
1433b2ob2o190b2o2bo5b2o2bo12b2o$
1433b2ob2o105b3o3b3o80bobo5b2o$
1428b2o3bo3bo105bo2bobo2bo81b2o3b3o$
1428b2o4b3o105bo3bobo3bo$
1435bo106b4o3b4o80b2o3b3o$
1543bo7bo80bobo5b2o$
1632bo5b2o2bo$
1632b2o8bo$
1637bo3bo$
1539b3o94bo$
1539bo$
1540bo124b2o$
1550bo114b2o$
1549b3o$
1548bo3bo$
1548b2ob2o90b2o106bo$
1548b2ob2o90bobo106bo3bo$
1643bo99b2o2b2o8bo12b2o$
1548b2ob2o190b2o2bo5b2o2bo12b2o$
1548b2ob2o105b3o3b3o80bobo5b2o$
1492bobo48b2o3bo3bo105bo2bobo2bo81b2o3b3o$
1492b2o35b3o11b2o4b3o105bo3bobo3bo$
1493bo37bo18bo106b4o3b4o80b2o3b3o$
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1619b2o36b$
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1664b3o$
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1858b2o2b2o8bo12b2o$
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1663b2ob2o105b3o3b3o80bobo5b2o$
1658b2o3bo3bo105bo2bobo2bo81b2o3b3o$
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1778b2ob2o105b3o3b3o80bobo5b2o$
1773b2o3bo3bo105bo2bobo2bo81b2o3b3o$
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1780bo106b4o3b4o80b2o3b3o$
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1977bo5b2o2bo$
1977b2o8bo$
1621b3o226bo131bo3bo$
1623bo224b2o131bo$
1622bo226b2o36b$
2010b2o$
1446bobo446bo114b2o$
1446b2o35b3o408b3o$
1447bo37bo262b2o143bo3bo$
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1749bo143b2ob2o199bo3bo$
2088b2o2b2o8bo12b2o$
1574bo318b2ob2o190b2o2bo5b2o2bo12b2o$
1572b2o319b2ob2o105b3o3b3o80bobo5b2o$
1573b2o313b2o3bo3bo105bo2bobo2bo81b2o3b3o$
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1876bo18bo106b4o3b4o80b2o3b3o$
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1471bobo225bobo390b2o8bo$
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1700bo395bo$
2002b$
2125b2o$
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2009b3o$
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2091bo111b2o2b2o8bo12b2o$
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1462bo545b2ob2o105b3o3b3o80bobo5b2o$
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1952b2o49b2o4b3o105bo3bobo3bo$
1953bo56bo106b4o3b4o80b2o3b3o$
1551bo566bo7bo80bobo5b2o$
1549b2o656bo5b2o2bo$
1550b2o655b2o8bo$
1851b3o358bo3bo$
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1852bo264b$
2240b2o$
1676bobo446bo114b2o$
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2206bo11bo99b2o2b2o8bo12b2o$
1575b3o545b2ob2o190b2o2bo5b2o2bo12b2o$
1577bo262b2o281b2ob2o105b3o3b3o80bobo5b2o$
1576bo262bobo276b2o3bo3bo105bo2bobo2bo81b2o3b3o$
1841bo276b2o4b3o105bo3bobo3bo$
2125bo106b4o3b4o80b2o3b3o$
2233bo7bo80bobo5b2o$
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2233b2o3bo3bo105bo2bobo2bo81b2o3b3o$
2219b3o11b2o4b3o105bo3bobo3bo$
2221bo18bo106b4o3b4o80b2o3b3o$
2220bo127bo7bo80bobo5b2o$
2437bo5b2o2bo$
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2442bo3bo$
2441bo$
1414b3o930b$
1416bo1053b2o$
1415bo490bobo446bo114b2o$
1906b2o446b3o$
1907bo445bo3bo$
1505bo847b2ob2o93b$
1503b2o848b2ob2o93b$
1504b2o945b$
2353b2ob2o$
2353b2ob2o105b3o3b3o$
2348b2o3bo3bo105bo2bobo2bo$
1403b2o943b2o4b3o105bo3bobo3bo$
1402bobo225bobo722bo106b4o3b4o$
1404bo225b2o831bo7bo$
1631bo302b$
2162b$
2426b$
2462b$
1529b3o226bo703b$
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1530bo226b2o34bobo674bo$
1795bo673b3o$
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1391b3o1074b2ob2o$
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1920b3o226bo318b2ob2o$
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1921bo226b2o34bobo276b2o3bo3bo$
2186bo276b2o4b3o$
2470bo$
2011bo440b$
2009b2o36b2o$
2010b2o34bobo228b$
1380b2o666bo265b$
1379bobo225bobo704b$
1381bo225b2o705b$
1608bo302b$
2139b$
2403b$
2440b$
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1733b2o705b$
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2265b$
2302b$
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2302b$
1863b$
2127b$
2164b$
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2254b$
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1345b3o665bo265b$
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1588bo225b2o265b$
1815bo302b$
2346b$
1449b2o932b$
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1980b$
2205bobo$
1311b2o892b2o38b$
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1312bo262b3o667b$
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2068bo302b$
1437b3o226bo704b$
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1438bo226b2o34bobo228b$
1703bo492b$
2231b2o$
2230bobo$
1564b2o666bo$
1563bobo225bobo$
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2323b$
2360b$
2360b$
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2222b$
2222b$
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2199b$
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1530bo490bobo$
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1920b3o227b$
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2277b$
2314b$
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2176b$
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1332bo969b$
1863b$
2127b$
2164b$
1230b3o931b$
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1319b2o36b2o666bo265b$
1320b2o34bobo932b$
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1623bo224b2o36b2o$
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2153b$
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2141b$
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1963b2o36b2o$
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2002bo265b$
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2093b$
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2130b$
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1952bobo$
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2118b$
1184b3o931b$
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1676b2o35b3o226bo$
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2245b$
2245b$
1575b3o226bo440b$
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2107b$
2107b$
2107b$
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1932b$
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2233b$
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2222b$
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1101bobo968b$
1101b2o969b$
1102bo300b2o667b$
1402bobo228b$
1404bo491bo$
1894b2o36b2o$
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1933bo265b$
2199b$
2199b$
1794b2o$
1091bo701bobo228b$
1089b2o704bo265b$
1090b2o262bobo704b$
1354b2o705b$
1355bo302b$
1883bobo$
1883b2o265b$
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1253b3o931b$
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1254bo493b$
2012b$
2049b$
1115b3o226bo704b$
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1873bo$
1871b2o38b$
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2176b$
2176b$
1735bo440b$
1733b2o38b$
1734b2o265b$
1104b2o932b$
1103bobo225bobo704b$
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2164b$
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1978b$
2015b$
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1449b2o667b$
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1980b$
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1135b2o704bo265b$
1136b2o969b$
2107b$
1702b2o$
1701bobo228b$
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1262b2o705b$
1263bo300b2o$
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2095b$
2095b$
2095b$
1656b$
1920b$
1957b$
1957b$
1957b$
1515bobo$
1515b2o35b3o227b$
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1818bo265b$
1377bobo704b$
1377b2o705b$
1378bo302b$
1909b$
1946b$
1239bobo704b$
1239b2o264bo440b$
1240bo262b2o36b2o$
1504b2o34bobo228b$
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2072b$
2072b$
2072b$
1633b$
1667b3o227b$
1669bo264b$
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1265b2o667b$
1264bobo228b$
1266bo262b3o227b$
1531bo262b2o$
1530bo262bobo228b$
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2061b$
1391b3o667b$
1393bo264b$
1392bo493b$
1923b$
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1253b3o667b$
1255bo262b2o$
1254bo262bobo228b$
1519bo262b3o227b$
1078bobo703bo264b$
1078b2o703bo265b$
1079bo969b$
1610b$
1644b3o227b$
1646bo264b$
1645bo265b$
1242b2o667b$
1241bobo228b$
1243bo492b$
1771b2o$
1770bobo228b$
1772bo265b$
1331bobo704b$
1331b2o705b$
1332bo302b$
1863b$
1900b$
1900b$
1459bo440b$
1457b2o36b2o$
1458b2o34bobo228b$
1496bo262b3o227b$
1761bo264b$
1321bo438bo265b$
1319b2o36b2o667b$
1320b2o34bobo228b$
1358bo492b$
1888b$
1888b$
1888b$
1446bobo$
1446b2o265b$
1447bo300b2o$
1747bobo228b$
1749bo265b$
2015b$
2015b$
1612b$
1840b$
1877b$
1877b$
1207b3o667b$
1209bo262b2o$
1208bo262bobo228b$
1473bo492b$
2003b$
2003b$
2003b$
1561bobo$
1561b2o265b$
1562bo302b$
1160bo704b$
1158b2o705b$
1159b2o265b$
1690b$
1727b$
1955b$
1992b$
1285bobo704b$
1285b2o35b3o667b$
1286bo37bo264b$
1323bo493b$
1854b$
1147bobo704b$
1147b2o35b3o667b$
1148bo37bo264b$
1185bo493b$
1943b$
1980b$
1275bo704b$
1273b2o705b$
1274b2o265b$
1805b$
1842b$
1137bo704b$
1135b2o705b$
1136b2o265b$
1667b$
1702b2o$
1701bobo228b$
1703bo265b$
1969b$
1299b3o226bo440b$
1301bo224b2o38b$
1300bo226b2o265b$
1831b$
1831b$
1831b$
1428b$
1656b$
1690b3o227b$
1692bo264b$
1023b3o665bo265b$
1025bo931b$
1024bo493b$
1782b$
1819b$
1114bo704b$
1112b2o36b2o667b$
1113b2o34bobo225bobo$
1151bo225b2o265b$
1378bo302b$
1909b$
1012b2o932b$
1011bobo932b$
1013bo932b$
1541b2o$
1540bobo228b$
1542bo265b$
1101bobo704b$
1101b2o705b$
1102bo302b$
1633b$
1667b3o227b$
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1229bo438bo265b$
1227b2o705b$
1228b2o265b$
1759b$
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1091bo704b$
1089b2o36b2o667b$
1090b2o34bobo225bobo$
1128bo225b2o264bo$
1355bo262b2o38b$
1619b2o265b$
1923b$
1923b$
1923b$
1520b$
1748b$
1785b$
1785b$
1785b$
1382b$
1610b$
1874b$
1911b$
977b3o931b$
979bo931b$
978bo493b$
1736b$
1773b$
839b3o931b$
841bo931b$
840bo493b$
1368b3o227b$
1370bo262b2o$
1369bo262bobo228b$
1634bo265b$
1193bobo704b$
1193b2o705b$
1194bo300b2o$
1494bobo228b$
1496bo265b$
1762b$
1762b$
1359b$
1587b$
1851b$
1888b$
954b3o931b$
956bo931b$
955bo493b$
1713b$
1750b$
1045bo704b$
1043b2o705b$
1044b2o265b$
1574bo$
1572b2o38b$
1573b2o265b$
1877b$
1877b$
1436bo440b$
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423b2o3b2o2b2o106bo2bobo2bo42b2o105b3o5b3o432b$
424b5o3b2o108bo3bo44b2o107b3ob3o434b$
425b3o112b2o5b2o153bobo101b2o5b2o$
425b3o111b3o5b3o149bo2bobo2bo97bo2bo3bo2bo150b$
539b3o5b3o148bo2bo3bo2bo97bo2bobo2bo188b$
699b2o5b2o101bobo191b$
495b2o310b3ob3o114b2o73b$
495b2o308b3o5b3o112b2o$
805b2o7b2o12b$
540b3o119b2o141b2o7b2o46b3o227b$
540b3o62bo3bo52b2o142bob2ob2obo49bo264b$
539b5o61bo3bo196b3o3b3o48bo265b$
538b2o3b2o262bo5bo315b$
538b2o3b2o270bo5bo$
602b2obo3bob2o201b3o3b3o131b$
603b3o3b3o43b3o3b3o54b2o94bob2ob2obo168b$
604bo5bo44bo2bobo2bo54b2o93b2o7b2o167b$
538b2o3b2o109bo3bobo3bo148b2o7b2o167b$
538b2o3b2o2b2o106bo2bobo2bo42b2o105b3o5b3o$
539b5o3b2o108bo3bo44b2o107b3ob3o$
540b3o112b2o5b2o153bobo31b2o68b2o5b2o$
540b3o111b3o5b3o149bo2bobo2bo27bobo67bo2bo3bo2bo150b$
654b3o5b3o148bo2bo3bo2bo5bo22bo68bo2bobo2bo188b$
814b2o5b2o7b2o92bobo191b$
610b2o217b2o91b3ob3o114b2o73b$
610b2o308b3o5b3o112b2o$
920b2o7b2o12b$
655b3o119b2o141b2o7b2o46b3o$
655b3o62bo3bo52b2o142bob2ob2obo49bo$
654b5o61bo3bo196b3o3b3o48bo$
653b2o3b2o262bo5bo$
653b2o3b2o270bo5bo$
717b2obo3bob2o111b3o87b3o3b3o131b$
718b3o3b3o43b3o3b3o54b2o6bo87bob2ob2obo168b$
719bo5bo44bo2bobo2bo54b2o5bo87b2o7b2o167b$
653b2o3b2o109bo3bobo3bo148b2o7b2o167b$
653b2o3b2o2b2o106bo2bobo2bo42b2o105b3o5b3o$
654b5o3b2o108bo3bo44b2o107b3ob3o$
655b3o112b2o5b2o153bobo101b2o5b2o$
655b3o111b3o5b3o149bo2bobo2bo97bo2bo3bo2bo$
769b3o5b3o148bo2bo3bo2bo97bo2bobo2bo$
929b2o5b2o101bobo$
725b2o310b3ob3o$
725b2o308b3o5b3o$
1035b2o7b2o12b$
770b3o119b2o141b2o7b2o49b$
770b3o62bo3bo52b2o142bob2ob2obo50b$
769b5o61bo3bo196b3o3b3o50b$
768b2o3b2o262bo5bo$
768b2o3b2o270bo5bo$
832b2obo3bob2o201b3o3b3o$
833b3o3b3o43b3o3b3o54b2o94bob2ob2obo$
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768b2o3b2o109bo3bobo3bo148b2o7b2o$
768b2o3b2o2b2o106bo2bobo2bo42b2o105b3o5b3o$
769b5o3b2o108bo3bo44b2o107b3ob3o$
770b3o112b2o5b2o153bobo33b$
770b3o111b3o5b3o149bo2bobo2bo30b$
884b3o5b3o148bo2bo3bo2bo29b$
1044b2o5b2o9b$
840b2o220b$
840b2o2$
885b3o119b2o$
885b3o62bo3bo52b2o$
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884b5o3b2o108bo3bo44b2o$
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999b3o5b3o2$
955b2o$
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1064bo5bo44bo2bobo2bo$
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999b5o3b2o108bo3bo$
1000b3o112b2o5b2o$
1000b3o111b3o5b3o$
1114b3o5b3o2$
1070b2o$
1070b2o2$
1115b3o$
1115b3o$
1114b5o$
1113b2o3b2o$
1113b2o3b2o4$
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!

A quick google search I find that the RLEextension is related to Run Length Encoded Bitmaps.

Further searching I find that there is a tool called “Golly” for viewing RLE files.

I let the online webapp load and then open my golly.rle file in it:

That gives me the flag in a scrolling marquis-type display:

UDCTF{th3y_c4ll_thems3lves_the_fl4g_smash3rs}

This was a pretty unique challenge.

BlueHens CTF 2021: Minecraft: Modest Cipher

Posted on by gmk

This is from the BlueHensCTF 2021.

Challenge Author: Izzy and ProfNinja

For this challenge, We are given the following information and links:

Here is the mc86 Intro:

Here is the mc86 InitCode:

/give @p minecraft:written_book{title:"Init CPU",author:"UD Cyberscholars",generation:0,pages:[
"{\"text\":\"Click Here First\\n\",\"color\":\"dark_green\",\"bold\":true,\"underlined\":true,\"hoverEvent\":{\"action\":\"show_text\",\"value\":\"Creating RAM\"},\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/setblock ~1 ~ ~ minecraft:lime_shulker_box\"},
\"extra\":[
{\"text\":\"Click Here Second\\n\",\"color\":\"dark_green\",\"bold\":true,\"underlined\":true,\"hoverEvent\":{\"action\":\"show_text\",\"value\":\"Start Timing Belt\"},\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/setblock ~2 ~1 ~ minecraft:command_block[facing=up]{powered:0b,Command:\\\"setblock ~ ~-1 ~ air\\\"}\"}},
{\"text\":\"Click Here Third\\n\",\"color\":\"dark_green\",\"bold\":true,\"underlined\":true,\"hoverEvent\":{\"action\":\"show_text\",\"value\":\"Finishing Timing Belt\"},\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/setblock ~2 ~2 ~ minecraft:chain_command_block[facing=up]{powered:0b,auto:1b,conditionMet:0b,Command:\\\"execute if data block ~-1 ~-2 ~ Items[0].tag.pages[0] run setblock ~ ~-2 ~ redstone_block\\\"}\"}},
{\"text\":\"Click Here Fourth\\n\",\"color\":\"dark_green\",\"bold\":true,\"underlined\":true,\"hoverEvent\":{\"action\":\"show_text\",\"value\":\"Start CPU\"},\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/setblock ~3 ~ ~ minecraft:command_block[facing=east]{powered:0b,Command:\\\"data modify block ~2 ~ ~ Command set from block ~-2 ~ ~ Items[0].tag.pages[0]\\\"}\"}},
{\"text\":\"Click Here Fifth\\n\",\"color\":\"dark_green\",\"bold\":true,\"underlined\":true,\"hoverEvent\":{\"action\":\"show_text\",\"value\":\"Finishing CPU\"},\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/setblock ~4 ~ ~ minecraft:chain_command_block[facing=east]{powered:0b,auto:1b,conditionMet:0b,Command:\\\"data remove block ~-3 ~ ~ Items[0].tag.pages[0]\\\"}\"}},
{\"text\":\"Click Here Sixth\\n\",\"color\":\"dark_green\",\"bold\":true,\"underlined\":true,\"hoverEvent\":{\"action\":\"show_text\",\"value\":\"Placing ALU\"},\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/setblock ~5 ~ ~ minecraft:chain_command_block[facing=east]{powered:0b,auto:1b,conditionMet:0b}\"}}]}"]} 1

Finally, here is the challenge source code:

/give @p writable_book{pages:["/fill ~ ~4 ~ ~6 ~6 ~15 dirt","/fill ~ ~7 ~5 ~6 ~7 ~5 acacia_fence","/fill ~ ~7 ~3 ~6 ~7 ~3 acacia_fence","/fill ~4 ~7 ~1 ~4 ~7 ~7 acacia_fence","/fill ~2 ~7 ~1 ~2 ~7 ~7 acacia_fence","/setblock ~1 ~7 ~10 acacia_fence","/setblock ~2 ~7 ~11 acacia_fence","/setblock ~3 ~7 ~12 acacia_fence","/setblock ~4 ~7 ~13 acacia_fence","/setblock ~5 ~7 ~14 acacia_fence","/setblock ~5 ~7 ~10 acacia_fence","/setblock ~4 ~7 ~11 acacia_fence","/setblock ~2 ~7 ~13 acacia_fence","/setblock ~1 ~7 ~14 acacia_fence","/clone ~4 ~4 ~5 ~6 ~7 ~7 ~ ~-3 ~5","/fill ~1 ~-1 ~6 ~1 ~-2 ~6 air","/summon pig ~1 ~-2 ~6","/clone ~ ~4 ~5 ~2 ~7 ~7 ~ ~-3 ~9","/clone ~1 ~4 ~10 ~5 ~7 ~12 ~ ~-3 ~13","/clone ~2 ~4 ~3 ~4 ~7 ~5 ~ ~-3 ~17","/clone ~ ~4 ~5 ~2 ~7 ~7 ~ ~-3 ~21","/fill ~1 ~-1 ~22 ~1 ~-2 ~22 air","/summon pig ~1 ~-2 ~22","/clone ~4 ~4 ~1 ~6 ~7 ~3 ~ ~-3 ~25","/clone ~4 ~4 ~5 ~6 ~7 ~7 ~ ~-3 ~29","/fill ~1 ~-1 ~30 ~1 ~-2 ~30 air","/summon pig ~1 ~-2 ~30","/clone ~ ~4 ~1 ~2 ~7 ~3 ~ ~-3 ~33","/fill ~1 ~-1 ~34 ~1 ~-2 ~34 air","/summon pig ~1 ~-2 ~34","/clone ~ ~4 ~5 ~2 ~7 ~7 ~ ~-3 ~37","/clone ~ ~4 ~1 ~2 ~7 ~3 ~ ~-3 ~41","/clone ~ ~4 ~1 ~2 ~7 ~3 ~ ~-3 ~45","/fill ~1 ~-1 ~46 ~1 ~-2 ~46 air","/summon pig ~1 ~-2 ~46","/clone ~2 ~4 ~3 ~4 ~7 ~5 ~ ~-3 ~49","/clone ~2 ~4 ~3 ~4 ~7 ~5 ~ ~-3 ~53","/fill ~1 ~-1 ~54 ~1 ~-2 ~54 air","/summon pig ~1 ~-2 ~54","/clone ~3 ~4 ~10 ~5 ~7 ~14 ~ ~-3 ~57","/fill ~ ~4 ~ ~6 ~7 ~15 air"]}

As recommended by the challenge text, I got the latest Minecraft Java Launcher and launched a world:

I followed the YouTube video and gave myself a command block, placed it with a button on it, and posted the mc86 initcode:

I clicked the button and received an enchanted book:

I followed the instructions and clicked each of the six links to generate my mc86 computer in my world:

Next, following the YouTube video, I pasted the challenge source code into the command block I created earlier and click the button:

This gave me a 41 page book and quill:

I placed a button in the mc86 computer (as directed in the YouTube video) and and clicked it to run the challenge program:

This created a strange pattern of fence panels with pigs being in holes in some of the sections:

Here is a better view of the whole structure:

Based on the challenge name, I googled for ciphers containing symbols (looking for symbols similar to the fance panels). This led me to the pigpen cipher:

Being lazy, I go to my favorite cipher decoder website… dcode.fr:

I punch in the symbols found in my Minecraft world and click to decrypt it:

This gave me the flag:

UDCTF{LITERALPIGPENS}

UTCTF2021: Beginner: Cipher Gauntlet (100)

Posted on by gmk

This is from the UTCTF2021 CTF

Challenge Author: balex

For this challenge, we are given a hint and a text file:

A quick trip over to RapidTables and we get this:

Apparently the princess is in another castle. I see that there is what appears to be a base64 encoded string. A quick trip over to Base64Decode and we get this:

Yet another castle. This time I have another string that appears to be a cipher along with a clue. This leads me to think it could be a Caesar Cipher. A quick trip to dcode.fr and I get this:

congratulations! you have finished the beginner cryptography challenge. here is a flag for all your hard efforts: utflag{now_youre_playing_with_crypto}. you will find that a lot of cryptography is building off this sort of basic knowledge, and it really is not so bad after all. hope you enjoyed the challenge!