ASN.1, or Abstract Syntax Notation 1, is a standard format for representing and encoding abstract data types and values. ASN.1 is used by many security standards to represent and encode data, such as X.509, PKCS, and Kerberos.
 
This enhancement involves making an ASN.1 API publicly available in the Java SE API. This API would be composed of the internal 'DER' classes contained in the internal sun.security.util package. These APIs would be enhanced as appropriate to make them more flexible and extensible for use by developers.