Alphanumeric returns a random string of the given length using the 62 alphanumeric characters in the POSIX/C locale (a-z+A-Z+0-9).

ASCII returns a securely generated random ASCII string.

Hex returns a random string of the given length using the hexadecimal characters in lower case (0-9+a-f).

Salt generates a new random salt of the given size.

String returns a random string of a given length using the characters in the given string.