Dynamic Threshold Proxy Authenticated Encryption Scheme

The authenticated encryption schemes can be used to provides integration, authentication, and non-repudiation for the signing message while keeping the message secret from the public. In this paper, we propose a new (t, n) threshold proxy authenticated encryption scheme, in which at least t out of n proxy signers delegated by the original signer can sign messages on behalf of the original signer. This scheme not only has the advantages such as unforgeablity, nonrepudiation and secrecy, but also provides flexibility. We can announce the parameters to change the threshold value t. Once the combined proxy signers of threshold value t and announcing parameters that can generate a legal proxy signature, this result can enable the security to increase or reduce the threshold value flexibility. Therefore, the scheme in this paper provides an easy and convenient way to delegate the power of digitally signed message.