sangge/2023_Newbie_Contest_Question_Creation
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fix: update attachments

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This commit is contained in:
sangge 2023-10-21 10:46:08 +08:00
parent c93308391a
commit 9e7ca73d31
3 changed files with 21 additions and 5 deletions
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4
xiaosai/ecb_padding/crack.py
View File

@ -5,7 +5,7 @@ first_flag = b''
wordlist = b'0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM{}_'
for i in range(16):
for j in wordlist:
r = remote("172.20.14.117", 65311)
r = remote("172.20.14.117", 59250)
payload = b'0'*(16-5) + b'0' * (15 - i)\
+ first_flag + j.to_bytes() + \
b'0' * (15 - i)
@ -20,7 +20,7 @@ for i in range(16):
last_flag = b''
for i in range(21-16):
for j in wordlist:
r = remote("172.20.14.117", 65311)
r = remote("172.20.14.117", 59250)
payload = b'0' * 11 + j.to_bytes() + \
last_flag + b'0' * 27
r.sendline(payload)

15
xiaosai/factor_2048bits/crack.sage Normal file
View File

@ -0,0 +1,15 @@
hint = 170021659067442061523756541191993539248601165314725269340063885026090819928194021233489114706002869522375199940625136026822330472394573193982550217044532146962203411567638298486561460035048451998397915884861905155825573014911356931040204843324084786281107112092211904426426572148513199575481399847133231710208
n = 26572534665683235245636883276068606612246011683144885473463339711820331993493357279285848391008791322234296406608539840620252625886064149394162998948970494176467317183311068211754639508369506106626167584042532674048767021259563143175030276397301094824563794971045331643148544039656526615133318494601670688100830427083371422333448416345157657081894568628680132969792458721329931299527818220689347292610785587787837487603664368727957712489422350366840751269348100479824826707549651813948243868760028344290958809882314383956517334878930614926458454637703779278161529934602431923391507121553686269628353968327172758558101
cipher = 6757305476823187630788813544175078002034639295382430908622959031152682951668576844271799811383004513343837564381952708716729553254090143798506889925295074373036913929804491380602451212049174613264171604463300669869149837525862922090696673791849544763152707468306110063163234629066598567091839169641464962113876354673950799668460699078314705550375034690000052853842247971910604379818131880965835942702654798359475442300498917978942357402126717495842970216610908374556549274105304987976888600967085331993375097585293113427600688155704013684617306744103329525203776458981287207246516848585805560812026318668317699834254
def phase3(high_p, n):
R.<x> = PolynomialRing(Zmod(n), implementation='NTL')
p = high_p + x
x0 = p.small_roots(X = 2^256, beta = 0.1)[0]
P = int(p(x0))
Q = n // P
assert n == P*Q
return P, Q
p, q = phase3(hint, n)
print(p, q)

5
xiaosai/factor_2048bits/main.py
View File

@ -9,11 +9,12 @@ n = p * q
e = 65537
message = bytes_to_long(flag)
cipher = pow(message, e, n)
print(p)
print(q)
hint = (p >> 256) << 256
print('hint =', hint)
print('n = ', n)
print('cipher = ', cipher)
'''
hint = 170021659067442061523756541191993539248601165314725269340063885026090819928194021233489114706002869522375199940625136026822330472394573193982550217044532146962203411567638298486561460035048451998397915884861905155825573014911356931040204843324084786281107112092211904426426572148513199575481399847133231710208
n = 26572534665683235245636883276068606612246011683144885473463339711820331993493357279285848391008791322234296406608539840620252625886064149394162998948970494176467317183311068211754639508369506106626167584042532674048767021259563143175030276397301094824563794971045331643148544039656526615133318494601670688100830427083371422333448416345157657081894568628680132969792458721329931299527818220689347292610785587787837487603664368727957712489422350366840751269348100479824826707549651813948243868760028344290958809882314383956517334878930614926458454637703779278161529934602431923391507121553686269628353968327172758558101
cipher = 6757305476823187630788813544175078002034639295382430908622959031152682951668576844271799811383004513343837564381952708716729553254090143798506889925295074373036913929804491380602451212049174613264171604463300669869149837525862922090696673791849544763152707468306110063163234629066598567091839169641464962113876354673950799668460699078314705550375034690000052853842247971910604379818131880965835942702654798359475442300498917978942357402126717495842970216610908374556549274105304987976888600967085331993375097585293113427600688155704013684617306744103329525203776458981287207246516848585805560812026318668317699834254
'''