Commutative re-encryption techniques are important tools for different applications where the encryption and decryption operations are performed in arbitrary order. These techniques also enable one to transfer information securely in a network without any knowledge of public keys of other parties. The process of message transmission vastly depends on the performance of underlying commutative technique used for cryptographic operations. The aim of this paper is to inquest some recently invented commutative re-encryption techniques at every step of their operation and expose the technique with better performance. The content of the paper is broadly divided into three parts—describing the importance of the commutative re-encryption techniques, presenting some latest techniques along with proposing a modification for making their operations faster, and analyzing every operational step of both the naive and proposed techniques. The modification is proposed only for experimentally proved slow techniques to faster their operation and a comparison is made at the end to show the effectiveness of the modification in making the operations faster.
['Nazmul Islam', 'Kazi Md. Rokibul Alam', 'Shaikh Shiam Rahman']
Commutative Re-encryption Techniques: Significance and Analysis