$ cat writeup.md…
$ cat writeup.md…
cryptohack
Task: LWE encryption with e in {-1,0,1}, q=1048583, p=257, n=64. Server encrypts flag characters and chosen messages. Solution: encrypt m=0 to get b=A*S+p*e, multiply by p^{-1} mod q to get standard LWE with tiny noise; build q-ary lattice with 128 samples, LLL-reduce, Babai nearest plane recovers error vector and secret S.
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