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1. WO2020115265 - CERTIFICATELESS PUBLIC KEY ENCRYPTION USING PAIRINGS

Publication Number WO/2020/115265
Publication Date 11.06.2020
International Application No. PCT/EP2019/083943
International Filing Date 06.12.2019
IPC
H04L 9/08 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Arrangements for secret or secure communication
08Key distribution
H04L 9/30 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Arrangements for secret or secure communication
28using particular encryption algorithm
30Public key, i.e. encryption algorithm being computationally infeasible to invert and users' encryption keys not requiring secrecy
H04L 9/32 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Arrangements for secret or secure communication
32including means for verifying the identity or authority of a user of the system
CPC
H04L 9/0847
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Cryptographic mechanisms or cryptographic; arrangements for secret or secure communication
08Key distribution ; or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
0816Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
0838Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these
0847involving identity based encryption [IBE] schemes
H04L 9/0894
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Cryptographic mechanisms or cryptographic; arrangements for secret or secure communication
08Key distribution ; or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
0894Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage
H04L 9/3073
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Cryptographic mechanisms or cryptographic; arrangements for secret or secure communication
30Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy
3066involving algebraic varieties, e.g. elliptic or hyper-elliptic curves
3073involving pairings, e.g. identity based encryption [IBE], bilinear mappings or bilinear pairings, e.g. Weil or Tate pairing
H04L 9/321
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Cryptographic mechanisms or cryptographic; arrangements for secret or secure communication
32including means for verifying the identity or authority of a user of the system ; or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
321involving a third party or a trusted authority
Applicants
  • SECURE-IC SAS [FR]/[FR]
Inventors
  • DUGARDIN, Margaux
  • FACON, Adrien
  • GUILLEY, Sylvain
Agents
  • HNICH-GASRI, Naïma
Priority Data
18306629.906.12.2018EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CERTIFICATELESS PUBLIC KEY ENCRYPTION USING PAIRINGS
(FR) CRYPTAGE DE CLÉS PUBLIQUES SANS CERTIFICAT À L'AIDE D'APPARIEMENTS
Abstract
(EN)
A transmitter device (103) for sending an encrypted message to a receiver device (105) in an identity-based cryptosystem (100), the transmitter device (103) being associated with a transmitter identifier. The transmitter device (103) is configured to receive a transmitter partial private key from a trusted center (101), the transmitter device (103) being configured to: - send a request for two public session keys to the receiver device (105); - receive from the receiver device (105) a first ciphertext set, the first ciphertext set being derived from an encryption and authentication of two public session keys; - decrypt and authenticate the two public session keys from the first ciphertext set using a receiver identifier and the transmitter partial private key; - determine a second ciphertext set from the transmitter partial private key, from the receiver identifier, and from the two public session keys, the second ciphertext comprising an encrypted message; - send the second ciphertext set to the receiver device (105).
(FR)
La présente invention concerne un dispositif émetteur (103) conçu pour envoyer un message crypté à un dispositif récepteur (105) dans un système cryptographique basé sur l'identité (100). Le dispositif émetteur (103) est associé à un identifiant d'émetteur. Le dispositif émetteur (103) est configuré pour : - recevoir une clé privée partielle de l'émetteur provenant d'un centre de confiance (101) ; - envoyer au dispositif récepteur (105) une demande relative à deux clés de session publiques ; - recevoir du dispositif récepteur (105) un premier ensemble de cryptogrammes, le premier ensemble de cryptogrammes étant dérivé d'un cryptage et d'une authentification des deux clés de session publiques ; - décrypter et authentifier les deux clés de session publiques à partir du premier ensemble de cryptogrammes à l'aide d'un identifiant de récepteur et de la clé privée partielle de l'émetteur ; - déterminer un second ensemble de cryptogrammes à partir de la clé privée partielle de l'émetteur, de l'identifiant de récepteur et des deux clés de session publiques, le second ensemble de cryptogrammes contenant un message crypté ; et - envoyer le second ensemble de cryptogrammes au dispositif récepteur (105).
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