A minimal CSPRNG using a simple accumulator. ALEPH is a fast, small-state, cryptographically secure pseudo-random number generator and stream cipher. ALEPH exhibits uniform distribution, mixes rapidly, has no detected bias, and comes in three variants: ALEPH16, with an internal state array of 16+5 32-bit words; ALEPH32, with an internal state of 32+5 words; and ALEPH64 with a 64+5-word state. The former permit seeding with a key of up to 512 or 1024 bits, the latter with a 2048-bit key.