General Security Considerations for Crypto Assets Exchange
draft-vcgtf-crypto-assets-security-considerations-00

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Network Working Group                                        H. Nakajima
Internet-Draft                                             Mercari, Inc.
Intended status: Informational                              June 7, 2018
Expires: December 9, 2018

       General Security Considerations for Crypto Assets Exchange
          draft-vcgtf-crypto-assets-security-considerations-00

Abstract

   This document discusses the threat, risk, and controls on the
   followings; Online system of crypto assets exchange that provides the
   exchange service to its customer (consumers and trade partners);
   assets information (including the private key of the crypto assets)
   that the online system of a crypto assets exchange manages; Social
   impact that can arise from the discrepancy in the security measures
   that are implemented in the online system of a crypto assets
   exchange.

   This document is applicable to the crypto assets exchanges that
   manages the private key that corresponds to the crypto assets.  It
   includes the organizations that outsources the key management to
   another organization.  In such a case, the certain recommendations
   applies to those outsourcers.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on December 9, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Nakajima                Expires December 9, 2018                [Page 1]
Internet-DraGeneral Security Considerations for Crypto Assets  June 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Scope of this document  . . . . . . . . . . . . . . . . . . .   3
   3.  Conventions and Definitions . . . . . . . . . . . . . . . . .   3
   4.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Basic description of a model online system of a crypto assets
       exchange  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     5.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   3
     5.2.  A basic model of online system of a crypto assets
           exchange and its functional components  . . . . . . . . .   3
     5.3.  The flow leading to the sending of the transaction  . . .   4
     5.4.  Types of keys that are used for signature and encryption    4
       5.4.1.  Type of keys  . . . . . . . . . . . . . . . . . . . .   4
       5.4.2.  A flow for the key generation and the key usage . . .   4
       5.4.3.  On the usage of multiple keys . . . . . . . . . . . .   4
       5.4.4.  On the suspension of keys . . . . . . . . . . . . . .   4
     5.5.  On the characteristics of crypto assets on Blockchain and
           distributed ledger technologies . . . . . . . . . . . . .   4
       5.5.1.  General . . . . . . . . . . . . . . . . . . . . . . .   4
       5.5.2.  The importance of the private key used for signing  .   4
       5.5.3.  Diversity of implementations  . . . . . . . . . . . .   4
       5.5.4.  Risk on the unapproved transactions . . . . . . . . .   4
   6.  Basic objectives for the security management of crypto assets
       exchanges . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   7.  Approaches to basic security controls . . . . . . . . . . . .   4
   8.  Sector specific security management controls for crypto
       assets exchanges  . . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   5
     8.2.  On the direction of the information security management .   5
     8.3.  On the controls for key recovery  . . . . . . . . . . . .   5
     8.4.  On the controls against theft and leakage of the private
           key for signing . . . . . . . . . . . . . . . . . . . . .   5
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