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Optimization of The Gronsfeld Cipher Key Using Okamoto-Uchiyama Public-Key Cryptosystem for Data Security

All aspects of life requires security, including in computer. Cryptography is one of the methods continually developed in computer security. Combining ciphers is an effort to improve security with the expectation to increase the security level. This paper compared the execution time as a parameter between Gronsfeld cipher and optimized Gronsfeld cipher key using Okamoto-Uchiyama cryptosystem. The result of execution time was between 0.0030-0.0040 seconds for Gronsfeld cipher, and up to 0.0050 seconds for Gronsfeld cipher with key optimization using Okamoto-Uchiyama