Length Hiding Padding for the Transport Layer Security Protocol

Document Type Expired Internet-Draft (individual)
Authors Alfredo Pironti  , Nikos Mavrogiannopoulos 
Last updated 2014-03-15 (latest revision 2013-09-11)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This memo proposes length hiding methods of operation for the TLS protocol. It defines a TLS extension to allow arbitrary amount of padding in any TLS ciphersuite, and it presents guidelines and a reference implementation of record fragmentation and padding so that the length of the exchanged messages is effectively concealed within a given range of lengths. The latter guidelines also apply to the standard TLS padding allowed by the TLS block ciphers.


Alfredo Pironti (alfredo.pironti@inria.fr)
Nikos Mavrogiannopoulos (nmav@gnutls.org)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)