This paper presents an implementation of three encryption algorithms and a comparison between them based on CPU execution time. The CPU execution time is broken down to kernel and user time. The selected algorithms are: DES, Triple-DES (T-DES) and Blowfish. These are symmetric block encryption algorithms. The objective of this research is to evaluate the performance of the three cryptography algorithms in terms of the processing time required in the kernel and user space for generating the secret key, encryption and decryption operations. The powerful portable programmning language Java and JCA (Java Cryptography Architecture) is used in implementing the encryption algorithms. The performance of the implemented encryption algorithms will be evaluated on SunOS platforms. The results show that the Blowfish algorithm is the fastest, followed by the DES algorithm then the T-DES algorithm.

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In this paper we present empirical results obtained from Java implementation of Elliptic curve Cryptosystem (ECC) as an asymmetric block cipher algorithm and a set of symmetric block cipher algorithms namely Triple-Data Encryption Standard (T-DES), Advanced Encryption Standard (AES), and Blowfish. Performance evaluation based on CPU execution time is presented under WinXP and Linux.We used in our implementation Java programming language, Java Cryptography Architecture (JCA) and Java Cryptography Extension (JCE). The evaluation of the performance of these algorithms is done for secret key generation and encryption and decryption operations. Results indicated that ECC outperforms the other encryption/decryption algorithms considered in this study regarding the security strength, speed, and key size of ECC. Also, ECC's performance advantage increases as security needs increases for newly emerging applications.

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