Takashi Nishide

Improved proxy re-encryption scheme for symmetric key cryptography

2017

A proxy re-encryption scheme is a scheme that can be executed by a semi-trusted proxy, so that we can convert a ciphertext encrypted with a key to another ciphertext without allowing the proxy to access …

A privacy-enhanced access log management mechanism in SSO systems from nominative signatures

2017 · International Journal of Applied Cryptography

In online services, a service provider (SP) manages access logs containing customers' buying histories. Therefore, user's information is revealed from the exposed logs if each customer can be linked. In fact, such information exposure has …