scrypt (RFC 7914) is a password KDF designed to be expensive in memory as well as CPU, which is what makes it hard to attack with GPUs and ASICs. It is used by Litecoin, Tarsnap, and Android disk encryption. The parameters are N (cost), r (block size), and p (parallelism); memory is roughly 128 × N × r × p bytes.
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N = 215 = 32,768 — these parameters need about 32 MB of memory.
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