Tags: crypto
Rating:
# mfine.py
```py
key = 'RVWA6IIHTWAJH1VWEAH0A6AR 1WAFIA2FTF6G1V6XWRHJA0DX0RHRDRHFTAJH1VWEAQVWEWAW6JVAGWRRWEAHTA6TA6G1V6XWRAH0A2611W5ARFAHR0ATD2WEHJAWSDH#6GWTRAWTJE 1RW5AD0HT4A6A0H21GWA26RVW26RHJ6GAIDTJRHFTA6T5AJFT#WERW5AX6JUARFA6AGWRRWEARVWAIG64AIFEA FDAH0A#DGTJFTBM#ME RV9T4OJ8TOXMOXENUMTO9IO NDO6EMOZ28EROMTND4V_ARVWAIFE2DG6AD0W5A2W6T0ARV6RAW6JVAGWRRWEAWTJE 1R0ARFAFTWAFRVWEAGWRRWEA6T5AX6JUA646HTA2W6THT4ARVWAJH1VWEAH0AW00WTRH6GG A6A0R6T56E5A0DX0RHRDRHFTAJH1VWEAQHRVA6AEDGWA4F#WETHT4AQVHJVAGWRRWEA4FW0ARFAQVHJVA0HTJWARVWA6IIHTWAJH1VWEAH0A0RHGGA6A2FTF6G1V6XWRHJA0DX0RHRDRHFTAJH1VWEAHRAHTVWEHR0ARVWAQW6UTW00W0AFIARV6RAJG600AFIAJH1VWE0'
def search_a_b(plaintext):
for a in range(m+1):
for b in range(m+1):
ciphertext = ''
for letter in plaintext:
i = ALPHA.index(letter)
c = (a*i + b) % m
ciphertext += ALPHA[c]
if ciphertext in key:
return a, b
return a, b
def decrype(plaintext, a, b):
ciphertext = ''
for x in range(len(key)):
for letter in plaintext:
i = ALPHA.index(letter)
c = (a*i + b) % m
if key[x] == ALPHA[c]:
ciphertext += letter
return ciphertext
ALPHA = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ{}_ #"
m = len(ALPHA)
a, b = search_a_b('VULNCON')
print(decrype(ALPHA, a, b))
```
# FLAG
**`VULNCON{3V3RYTH1NG_C4N_B3_BR0K3N_1F_Y0U_AR3_5M4RT_3N0UGH}`**
