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1. EP3664360 - CERTIFICATELESS PUBLIC KEY ENCRYPTION USING PAIRINGS

Office European Patent Office
Application Number 18306629
Application Date 06.12.2018
Publication Number 3664360
Publication Date 10.06.2020
Publication Kind A1
IPC
H04L 9/08
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Arrangements for secret or secure communication
08Key distribution
H04L 9/30
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
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
Inventors DUGARDIN MARGAUX
FACON ADRIEN
GUILLEY SYLVAIN
Designated States
Priority Data 18306629 06.12.2018 EP
Title
(DE) ZERTIFIKATSLOSE PUBLIC-KEY-VERSCHLÜSSELUNG DURCH PAIRINGS
(EN) CERTIFICATELESS PUBLIC KEY ENCRYPTION USING PAIRINGS
(FR) SCHÉMA DE CHIFFREMENT À CLEF PUBLIQUE CERTIFICAT À L'AIDE DE COUPLAGE
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).

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