With the development of 5G and the Internet of Things (IoT), mobile terminals are widely
used in various applications under multicast scenarios. However, due to the limited …

To provide a terminal device that can share a session key for use in encryption
communication with multiple terminal devices at a certain timing without relying on an …

Plurality of users share a common key while permitting change of members sharing the
common key and computational complexity required for key exchange is reduced. R, and c …

A communication terminal which is capable of reducing load of a server apparatus by
reutilizing a message key to be used for encrypting a message is provided. The …

There is provided a data sharing technique in which it is possible to update data stored in a
server before to such data that is decryptable on the communication terminal side using an …

A key exchange device is provided that includes: a shared secret key storage in which
shared secret information mk ik which is information different from a secret key of the key …

Plurality of users share a common key while permitting change of members sharing the
common key and computa tional complexity required for key exchange is reduced. R; and c; …

A key distribution system includes a representative user terminal 2 p, a server apparatus 3,
and an (n+ 1)-th user terminal 2 n+ 1. The representative user terminal 2 p uses a public key …

A communication apparatus for use in a communication system including a call control
apparatus and a key information distribution apparatus is provided. The communication …

In this paper, we propose the first identity-based dynamic multi-cast key distribution (ID-
DMKD) protocol which is secure against maximum exposure of secret information (eg, secret …