IP Flow Anonymization Support
RFC 6235
Internet Engineering Task Force (IETF) E. Boschi
Request for Comments: 6235 B. Trammell
Category: Experimental ETH Zurich
ISSN: 2070-1721 May 2011
IP Flow Anonymization Support
Abstract
This document describes anonymization techniques for IP flow data and
the export of anonymized data using the IP Flow Information Export
(IPFIX) protocol. It categorizes common anonymization schemes and
defines the parameters needed to describe them. It provides
guidelines for the implementation of anonymized data export and
storage over IPFIX, and describes an information model and Options-
based method for anonymization metadata export within the IPFIX
protocol or storage in IPFIX Files.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for examination, experimental implementation, and
evaluation.
This document defines an Experimental Protocol for the Internet
community. This document is a product of the Internet Engineering
Task Force (IETF). It represents the consensus of the IETF
community. It has received public review and has been approved for
publication by the Internet Engineering Steering Group (IESG). Not
all documents approved by the IESG are a candidate for any level of
Internet Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6235.
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RFC 6235 IP Flow Anonymization Support May 2011
Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................4
1.1. IPFIX Protocol Overview ....................................4
1.2. IPFIX Documents Overview ...................................5
1.3. Anonymization within the IPFIX Architecture ................5
1.4. Supporting Experimentation with Anonymization ..............6
2. Terminology .....................................................6
3. Categorization of Anonymization Techniques ......................7
4. Anonymization of IP Flow Data ...................................8
4.1. IP Address Anonymization ..................................10
4.1.1. Truncation .........................................11
4.1.2. Reverse Truncation .................................11
4.1.3. Permutation ........................................11
4.1.4. Prefix-Preserving Pseudonymization .................12
4.2. MAC Address Anonymization .................................12
4.2.1. Truncation .........................................13
4.2.2. Reverse Truncation .................................13
4.2.3. Permutation ........................................14
4.2.4. Structured Pseudonymization ........................14
4.3. Timestamp Anonymization ...................................15
4.3.1. Precision Degradation ..............................15
4.3.2. Enumeration ........................................16
4.3.3. Random Shifts ......................................16
4.4. Counter Anonymization .....................................16
4.4.1. Precision Degradation ..............................17
4.4.2. Binning ............................................17
4.4.3. Random Noise Addition ..............................17
4.5. Anonymization of Other Flow Fields ........................18
4.5.1. Binning ............................................18
4.5.2. Permutation ........................................18
5. Parameters for the Description of Anonymization Techniques .....19
5.1. Stability .................................................19
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RFC 6235 IP Flow Anonymization Support May 2011
5.2. Truncation Length .........................................19
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