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3.3.2 Compression algorithms used in the record layer

The TLS record layer also supports compression. The algorithms implemented in GnuTLS can be found in the table below. The included algorithms perform really good when text, or other compressible data are to be transferred, but offer nothing on already compressed data, such as compressed images, zipped archives etc. These compression algorithms, may be useful in high bandwidth TLS tunnels, and in cases where network usage has to be minimized. It should be noted however that compression increases latency.

The record layer compression in GnuTLS is implemented based on [RFC3749]. The supported algorithms are shown in Figure 3.2.

GNUTLS_COMP_UNKNOWN

Unknown compression method.

GNUTLS_COMP_NULL

The NULL compression method (no compression).

GNUTLS_COMP_DEFLATE

The DEFLATE compression method from zlib.

GNUTLS_COMP_ZLIB

Same as GNUTLS_COMP_DEFLATE .

Figure 3.2: Supported compression algorithms


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