Projects / basE91


basE91 is an advanced method for encoding binary data as ASCII characters. It is similar to UUencode or base64, but is more efficient. The overhead produced by basE91 depends on the input data. It amounts at most to 23% (versus 33% for base64) and can range down to 14%, which typically occurs on 0-byte blocks. This makes basE91 very useful for transferring larger files over binary unsafe connections like e-mail or terminal lines.

Operating Systems

Recent releases

  •  03 Nov 2006 15:22

    Release Notes: The encoding/decoding routines have been restructured to be thread-safe, and the syntax of the commandline frontend is more similar to base64 from the GNU coreutils now.

    •  25 Aug 2006 14:13

      Release Notes: The source code has been cleaned to avoid errors and warnings with the latest gcc versions, and the DOS assembly encoder has been rewritten to be faster and compatible down to Intel 8086.

      •  08 Oct 2005 23:41

        Release Notes: This version fixes Java-b91enc to handle file extensions case insensitively, and introduces a native DOS assembly implementation of the basE91 encoder.

        •  25 Jun 2005 21:12

          Release Notes: This version breaks backward compatibility because the basE91 alphabet was changed to reduce the occurrence of double quotes when encoding random data (e.g. compressed files). If the ASCII output needs to be enclosed in double quotes (e.g. in C or Java programs), this minimizes the need for escape characters. Before upgrading, users should decode all their basE91 encoded files.

          •  16 May 2005 20:41

            Release Notes: The AWK basE91 decoder no longer depends on GNU extensions.


            Project Spotlight


            A Fluent OpenStack client API for Java.


            Project Spotlight

            TurnKey TWiki Appliance

            A TWiki appliance that is easy to use and lightweight.