Fortuna is a cryptographically secure pseudorandom number generator (PRNG) devised by Bruce Schneier and Niels Ferguson. It is named after Fortuna, the Roman goddess of chance.
Fortuna is a family of secure PRNGs; its design leaves some choices open to implementors. It is composed of the following pieces:
- The generator itself, which once seeded will produce an indefinite quantity of pseudo-random data.
- The entropy accumulator, which collects genuinely random data from various sources and uses it to reseed the generator when enough new randomness has arrived.
- The seed file, which stores enough state to enable the computer to start generating random numbers as soon as it has booted.
The generator is based on any good block cipher. Practical Cryptography suggests AES, Serpent or Twofish. The basic idea is to run the cipher in counter mode, encrypting successive values of an incrementing counter. On its own, this would produce statistically identifiable deviations from randomness; for instance, generating 265 genuinely random 128-bit blocks would produce on average about one pair of identical blocks, but there are no repeated blocks at all among the first 2128 produced by a 128-bit cipher in counter mode. Therefore, the key is changed periodically: no more than 1 MiB of data is generated without a key change. The key is also changed after every data request (however small), so that a key compromise doesn't endanger old RNG outputs.
Entropy accumulator 
The entropy accumulator is designed to be resistant against "injection" attacks, without needing sophisticated (and inevitably unreliable) estimators of entropy. There are several "pools" of entropy; each entropy source distributes its alleged entropy evenly over the pools; and (here is the key idea) on the nth reseeding of the generator, pool k is used only if 2k divides n. Thus, the kth pool is used only 1/2k of the time. Higher-numbered pools, in other words, (1) contribute to reseedings less frequently but (2) collect a larger amount of entropy between reseedings. Reseeding is performed by hashing the specified entropy pools into the block cipher's key using two iterations of SHA-256.
Unless an attacker is able to control all the sources of alleged entropy flowing into the system (in which case no algorithm can save it from compromise), there will be some k for which the kth pool collects enough entropy between reseedings that a reseeding with that pool ensures security. And that pool will be used at an interval proportional to the amount of entropy in question. Therefore, the system will always recover from an injection attack, and the time it takes to do so is at most a constant factor greater than the theoretical time it could take if we were able to identify which sources of entropy were corrupt and which not.
This conclusion depends on there being enough pools. Fortuna uses 32 pools, and restricts reseeding to happen at most 10 times per second. Running out of pools would then take about 13 years, which Ferguson and Schneier deem long enough for practical purposes. More paranoid implementors, or ones requiring the generation of random data at a colossal rate and correspondingly frequent reseeding, could use a larger number of pools.
Fortuna differs from the earlier Yarrow algorithm family of Schneier, Kelsey and Ferguson mostly in its handling of the entropy accumulator. Yarrow required each source of entropy to be accompanied by a mechanism for estimating the actual entropy supplied, and used only two pools; and its suggested embodiment (called Yarrow-160) used SHA-1 rather than iterated SHA-256.
See also 
- Blum Blum Shub
- Cryptographically secure pseudorandom number generator
- Mersenne Twister
- Yarrow algorithm
- Niels Ferguson and Bruce Schneier, Practical Cryptography, published by Wiley in 2003. ISBN 0-471-22357-3.
- John Viega, "Practical Random Number Generation in Software," acsac, pp. 129, 19th Annual Computer Security Applications Conference (ACSAC '03), 2003
- Patch adding an implementation of Fortuna to the Linux kernel, seems to still do some Yarrow-style entropy estimation
- Fortuna implementation in C++
- Fortuna implementation in Python, part of the Python Cryptography Toolkit