Meta server: user isaac64 cryptographic pseudo random number generator [PRNG]. Isaac64 appears to be at least 1000 times faster than default openssl pseudo random number generator. For now for keys generation use openssl default PRNG, as the kes aren't generated very often. Use isaac64 to generate lease ids, instead of using sequential lease ids, in order to secure lease release by making virtually impossible to "guess" lease id. Use lease id as access tokens sequence numbers in order to avoid random number generation. Use layout manager's isaac64 to generate access token sequence under the "main" lock.