An ENID (Encrypted Numeric Identifier) is a 40- or 80-bit value, which can be used as a unique identifier.

An example of a 40-bit ENID:

m6sc7n75

And an 80-bit ENID:

y3gx5gxm-mpb8ey39

ENIDs are generated by encrypting plaintext bytes so that they appear pseudo-random. The encrypted bytes are then formatted as a variant of Base32 (Crockford's Base32) that excludes the letters i, l, o, and u. Each group of 40 bits is represented by 8 characters and separated by a hyphen.

This crate does not yet include a method for generating ENIDs, which will be added in a future version.

Some features of ENIDs:

• Short - ENIDs are 8 or 17 characters long, compared with 36-character UUIDs.
• Uniformly distributed - sequentially-generated ENIDs are unlikely to appear similar.
• URL-safe - ENIDs can be used in URLs without percent-encoding.