A Compression Method Designed for SMTP over TLS

  • Daigo Manabe
  • Shigetomo Kimura
  • Yoshihiko Ebihara
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3961)


TLS (Transport Layer Security) is a well-known protocol used to provide authentication and private communication for application protocols like HTTP (Hypertext Transfer Protocol) and SMTP (Simple Mail Transfer Protocol). The specification of TLS lays down that in the TLS record protocol, data transferred from the upper layer can be compressed before it is encrypted. However, since there are certain restrictions on the transfer of an E-mail, such as the need for text encoding of binary data and the recompression of already compressed data, using the compression mechanism on SMTP over TLS may result in a reduction in the compression performance. In order to solve these problems, this paper introduces a compression method specifically designed for use with SMTP over TLS. In network experiments, compression ratios and file transfer times for three kinds of E-mail were observed, with emulated bandwidth restrictions to represent three typical communication media, and the results show that the proposal method works efficiently especially for narrow bandwidth networks.


Compression Ratio Binary Data Text Data Compression Algorithm Compression Method 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Hoffman, P.: SMTP Service Extension for Secure SMTP over Transport Layer Security, RFC3207 (February 2002)Google Scholar
  2. 2.
    Klensin, J.: Simple Mail Transfer Protocol, RFC2821 (April 2001)Google Scholar
  3. 3.
    Dierks, T., Allen, C.: The TLS Protocol Version 1.0, RFC2246 (January 1999)Google Scholar
  4. 4.
    Deutsch, P.: DEFLATE Compressed Data Format Specification Version 1.3, RFC1951 (May 1996)Google Scholar
  5. 5.
    Hollenbeck, S.: Transport Layer Security Protocol Compression Methods, RFC3749 (May 2004)Google Scholar
  6. 6.
    Freed, N., Borenstein, N.S.: Multipurpose Internet Mail Extensions, RFC2045 to RFC2049 (November 1996)Google Scholar
  7. 7.
    Resnick, P.: Internet Message Format, RFC2822 (April 2001)Google Scholar
  8. 8.
    Okamoto, N., Kimura, S., Ebihara, Y.: An Introduction of Compression Algorithms into SSL/TLS and Proposal of Compression Algorithms Specialized for Application Protocols. In: Proceedings of AINA 2003, pp. 817–820 (March 2003)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Daigo Manabe
    • 1
  • Shigetomo Kimura
    • 1
  • Yoshihiko Ebihara
    • 1
  1. 1.Graduate School of Systems and Information EngineeringUniversity of TsukubaIbarakiJapan

Personalised recommendations