#1 TelAviv
What is the password? (File:7139a4ea239dcac655f7c38ca6a77b61.bin)
Hint: TeLaViv+ is a packet forensics challenge.
#2 AL's Revenge
- file 49dd327824d5afe9cdf931ea4b13719f.bin says xz compressed file -> xzcat > f
- file f says LLVM bitcode -> llvm-dis > f.s (only works with LLVM 2.8, not with 3.0)
- analyze disassembly, extract C representation:
int
VerifySerial(uint64_t name, uint64_t serial)
{
uint64_t a = 0x8000000000000000LL;
uint64_t b = 0xa348fccd93aea5a7LL;
uint64_t result = 0;
/* high order bit set? */
if (name & a)
a ^= b;
if (serial & a)
serial ^= b;
while (serial != 0) {
if (serial & 1)
result ^= name;
serial >>= 1;
name <<= 1;
if (name & a)
name ^= b;
}
return (result == 1);
}