ISO/IEC INTERNATIONAL STANDARD 11770-4 Second edition 2017-11-15 AMENDMENT 1 2019-09 Information technology Security techniques Key management - Part 4: Mechanisms based on weak secrets AMENDMENT 1: Unbalanced Password. Authenticated Key Agreement with Identity-Based Cryptosystems (UPAKA- IBC) Technologies de I'information - Techniques de sécurité - Gestion de clés - Partie 4: Meécanismes basés sur des secrets faibles AMENDEMENT 1: Accord dissymétrique de cle authentifié par mot de passe utilisant un mécanisme de chiffrement basé sur I'identité Reference number IEC IS0/IEC 11770-4:2017/Amd.1:2019(E) IS0/IEC2019 IS0/IEC 11770-4:2017/Amd.1:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0/IEC 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0/IEC 2019 - All rights reserved