| dc.description.abstract | Symmetric algorithms are known for their speed but face significant challenges in
secure key distribution, as the same key must be shared between sender and
receiver, which makes it vulnerable to interception. In contrast, asymmetric
algorithms provide enhanced security but are less efficient when encrypting and
decrypting large text messages. This research aims to enhance the security of
digital data and documents through the implementation of a hybrid cryptosystem
that integrates the Cramer-Shoup and Spritz algorithms. Brute force testing is
conducted to evaluate the system's resilience against brute force attacks, along with
an analysis of the system's effectiveness, encryption-decryption speed, and
efficiency in protecting various types of data and digital documents (such as .docx
and .pdf files). The research methodology includes a literature review, analysis of
the encryption-decryption process, brute force testing to assess system strength,
and performance testing using Python. Speed test results indicate that the hybrid
cryptosystem achieves fast encryption-decryption times, with an encryption time of
0.002607 milliseconds and decryption time of 0.001537 milliseconds for 400
characters. For digital documents in .pdf format, encryption time is 0.424478
milliseconds, and decryption time is 0.404343 milliseconds. Furthermore, brute
force testing confirms the system's resistance to brute force attacks, attributed to
the combination of Cramer-Shoup and Spritz algorithms, which increase the
complexity of cracking the encryption key. The application of the SHA-3 hash
function also proves effective in maintaining data integrity. In conclusion, the
hybrid cryptosystem offers a secure and efficient solution for protecting various
types of digital data, including text and documents, while also demonstrating
resilience to brute force attacks. | en_US |
