[鹏城杯 2022]easy_rsa

1.题目附件

import gmpy2
from Crypto.Util.number import *
import random
from secret import flag

m1 = flag[0:12]
m2 = flag[12:24]
m3 = flag[24:]

def encrypt1(m):
    while 1:
        e = random.randint(100, 1000)
        p = getPrime(1024)
        q = getPrime(1024)
        phi_n = (p - 1) * (q - 1)
        t = gmpy2.gcd(e, phi_n)
        if gmpy2.invert(e // t, phi_n) and t != 1:
            break
    n = p * q
    c = pow(m, e, n)
    print({'c': format(c, 'x'), 'p': format(p, 'x'), 'q': format(q, 'x'), 'e': format(e, 'x')})


def encrypt2(m):
    p = getPrime(1024)
    q = getPrime(1024)
    n = p * q
    e = 65537
    c = gmpy2.powmod(m, e, n)
    print({'c': format(c, 'x'), 'p': format((p >> 60) << 60, 'x'), 'e': format(e, 'x'), 'n': format(n, 'x')})


def encrypt3(m):
    p = getPrime(1024)
    q = getPrime(1024)
    n = p * q
    e = 65537
    M = 2022 * m * 1011 * p
    c = pow(M, e, n)
    print({'c': format(c, 'x'), 'n': format(n, 'x'),'e':format(e, 'x')})


if __name__ == '__main__':
    encrypt1(bytes_to_long(m1))
    encrypt2(bytes_to_long(m2))
    encrypt3(bytes_to_long(m3))

# {'c': '27455f081e4858790c6503580dad3302ae359c9fb46dc601eee98f05142128404e95377324720adbbdebf428549008bcd1b670f6749592a171b30316ab707004b9999f3b80de32843afdfd30505b1f4166a03cee9fc48902b74b6e850cfd268e6917c5d84e64f7e7cd0e4a30bfe5903fb5d821d27fdc817d9c4536a8e7aea55af266abcae857a8ffff2f741901baba1b44091a137c69c471c123ab0b80e250e055959c468e6e37c005105ecd7c8b48c659024e5e251df3eeff5da7b3d561cd98150da3575a16bee5f2524d2795fd4879487018345c1e96efc085ed45fb5f02c027aee5bca3aad0eb3e23376c0cd18b02fb05a1ff8fb1af0a3ce4bb671599894e', 'p': 'bb602e402b68a5cfcc5cfcc63cc82e362e98cb7043817e3421599a4bb8755777c362813742852dad4fec7ec33f1faec04926f0c253f56ab4c4dde6d71627fbc9ef42425b70e5ecd55314e744aa66653103b7d1ba86d1e0e21920a0bfe7d598bd09c3c377a3268928b953005450857c6cfea5bfdd7c16305baed0f0a31ad688bd', 'q': 'bb8d1ea24a3462ae6ec28e79f96a95770d726144afc95ffffa19c7c3a3786a6acc3309820ba7b1a28a4f111082e69e558b27405613e115139b38e799c723ab7fdd7be14b330b118ae60e3b44483a4c94a556e810ab94bbb102286d0100d7c20e7494e20e0c1030e016603bd2a06c1f6e92998ab68e2d420faf47f3ee687fb6d1', 'e': '292'}
# {'c': '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', 'p': 'a9cb9e2eb43f17ad6734356db18ad744600d0c19449fc62b25db7291f24c480217d60a7f87252d890b97a38cc6943740ac344233446eea4084c1ba7ea5b7cf2399d42650b2a3f0302bab81295abfd7cacf248de62d3c63482c5ea8ab6b25cdbebc83eae855c1d07a8cf0408c2b721e43c4ac53262bf9aaf7a000000000000000', 'e': '10001', 'n': '841a5a012c104e600eca17b451d5fd37c063ad347707a2e88f36a07e9ad4687302790466e99f35b11580cbe8b0a212e6709686c464a6393c5895b1f97885f23ea12d2069eb6dc3cb4199fb8c6e80a4a94561c6c3499c3c02d9dc9cf216c0f44dc91701a6d9ec89981f261a139500420a51014492f1da588a26e761439dd5739b32540ca6dc1ec3b035043bc535304a06ccb489f72fcd1aa856e1cffe195039176937f9a16bd19030d1e00095f1fd977cf4f23e47b55650ca4712d1eb089d92df032e5180d05311c938a44decc6070cd01af4c6144cdab2526e5cb919a1828bec6a4f3332bf1fa4f1c9d3516fbb158fd4fbcf8b0e67eff944efa97f5b24f9aa65'}
# {'c': '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', 'n': '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', 'e': '10001'}

脚本：

from Crypto.Util.number import  *
import gmpy2

def decrypt1():
    c = int("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",16)
    p = int("bb602e402b68a5cfcc5cfcc63cc82e362e98cb7043817e3421599a4bb8755777c362813742852dad4fec7ec33f1faec04926f0c253f56ab4c4dde6d71627fbc9ef42425b70e5ecd55314e744aa66653103b7d1ba86d1e0e21920a0bfe7d598bd09c3c377a3268928b953005450857c6cfea5bfdd7c16305baed0f0a31ad688bd",16)
    q = int("bb8d1ea24a3462ae6ec28e79f96a95770d726144afc95ffffa19c7c3a3786a6acc3309820ba7b1a28a4f111082e69e558b27405613e115139b38e799c723ab7fdd7be14b330b118ae60e3b44483a4c94a556e810ab94bbb102286d0100d7c20e7494e20e0c1030e016603bd2a06c1f6e92998ab68e2d420faf47f3ee687fb6d1",16)
    e = int("292",16)
    n = p*q
    phi = (p-1)*(q-1)
    t = gmpy2.gcd(e,phi)
    d = gmpy2.invert(e//t,phi)
    m = pow(c,d,n)
    msg = gmpy2.iroot(m,t)
    if msg[1]:
        return long_to_bytes(msg[0])

#高位攻击得出pq
def decrypt2():
    c = int("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",16)
    n = int("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",16)
    e = 65537
    p = 119234372387564173916926418564504307771905987823894721284221707768770334474240277144999791051191061404002537779694672314673997030282474914206610847346023297970473719280866108677835517943804329212840618914863288766846702119011361533150365876285203805100986025166317939702179911918098037294325448226481818486521
    q = 139862779248852876780236838155351435339041528333485708458669785004897778564234874018135441729896017420539905517964705602836874055417791439544162777504181482765029478481701166935117795286988835104239238153206137155845327225155932803904032184502243017645538314995056944419185855910939481260886933456330514972109
    phi = (p-1)*(q-1)
    d = gmpy2.invert(e,phi)
    m = pow(c,d,n)
    return long_to_bytes(m)

#nc不互素 得出pq
def decrypt3():
    c = int("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",16)
    n = int("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",16)
    e = 65537
    q = 156257733382410613100339225525620663418746113373124324691778995709856691398510079686004601488388949688857500467851395921680982651583998623751021727010545748331472217173299772670339057201230372999051110181487417832305686642349676833325446158667018941680139416480436427937163081110766379541483372737347915915783
    p = 157289834249335309920584094387179905109333782357706353959858861542878018979030833313128272507079198736286746117543595076191988536367839248453491343495526847975531764017423389238615020384944843842794127324547220666143228906649323977906490716889772848677295085816112100695189342834499071037390827664723648060943
    phi = (p-1)*(q-1)
    d = gmpy2.invert(e,phi)
    M = pow(c,d,n)
    m = M//(2022*1011*p)
    return long_to_bytes(m)


if __name__ == '__main__':
    print(decrypt1()+decrypt2()+decrypt3())
#PCL{16745c3b0c134c83b74f977260aae9b5}