
190 Computing in Geographic Information Systems
10.4.1.3 S-63
S-63 is an IHO standard for encrypting and securing ENC data. The standard
was adopted as the official IHO standard by the IHO member states in De-
cember 2002. The S-63 standard secures data by encrypting the basic transfer
database using the Blowfish algorithm, SHA-1-hashing the data based on a
random key and adding a CRC32 check. It also defines the use of DSA format
signatures to authenticate the data originator.
10.4.1.4 S-100
S-100 came into use on 1 January 2010. It explains how the IHO will use
and extend the ISO 1900 series of geographic standards for hydrographic,
maritime and related ...