Judul: Implementasi aritmatik field prima dengan bahasa c
Abstrak: Cryptography is the science of keeping message secure. Cryptography involves encryption and decryption of messages. Encryption is the process of converting a plaintext into chipertext and decryption is the process of getting back the encrypted message. Cryptographic systems can be divided into two kinds: symmetric-key cryptography and asymmetric-key cryptography (publickey cryptography). The major advantage of symmetric-key cryptography is high efficiency, but it has a number of drawbacks like key distribution and the provision of non-repudiation. Public-key cryptography provides solution to the problems in symmetric-key cryptography. Unfortunately, public-key operations are significantly slower than symmetric-key operation. It is caused by using a big number in its operations. The biggest problem of the big number is how to compute it in constrained machines like computer. A computer’s hardware can only perform operations on integers smaller than the machine word-size W. If bigger numbers are needed, the programmer has to provide routines for representation and manipulation of big number. In this research, big number is representated with base 2 W. This base is efficient in memory-space. Arithmetic of big number is constrained in prime-field. The big number that is used in this arithmetic is up to 1024 bit. Operations of this arithmetic are addition, subtraction, multiplication, division, and exponentiation. The result of this research shows that operations of big number can be executed fast in 32-bit computer
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Judul: Implementasi aritmetika Optimal Extension Field (OEF) menggunakan bahasa pemrograman C
Abstrak: Cryptography is the science to keep the message secure. Cryptography involves encryption and decryption of messages. Nowadays, the minimum key size for public key cryptography to reach the minimum security is claimed to be 1024 bit (RSA). With somekind of algorithm, the desktop computer that has 32 bit machine architecture could compute a number with that size easily, but not with the smaller machine that has only 8 bit or 16 bit architecture like handphones and smart cards. Those small machines need more time or maybe unable to compute a number with that size. Elliptic Curve Cryptography (ECC) is the solution of this problem. ECC has a great advantage. It can give a high security level of cryptography with smaller key size. As an example, ECC key with the size of 160 bit is claimed to be at the same level of security as compared to the conventional RSA key with 1024 bit of size. ECC implements a different kind of arithmetic field than that of the usual cryptosystem.
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Judul: Studi Kasus Liver Neoplasia pada Anjing Shih Tzu
Abstrak: Liver neoplasia is the excessive and uncontrolled replication of hepatocytes that forms nodules visible in ultrasonography. The purpose of this study is to study and discuss the characteristic, diagnosis and treatment of liver neoplasm through the interpretation of ultrasonography and hematology in a Shih Tzu dog. Ultrasonography is conducted with a Chison Q8 ultrasound machine with a 5 to 7 MHz frequency convex probe on lateral recumbency. The blood cells, liver enzymes and nodules sizes were the main parameters in this study. The results in the period of three years from 2021 to 2023 were interpreted and supported with secondary data sources. The Shih Tzu dog is 14 years old in the year 2023 with a body weight of 5.21kg. No obvious clinical signs were observed during previous examinations. However, lethargy, vomiting and anorexia were recorded in its latest examination. Thrombocytosis, granulocytosis, high liver enzymes and hypoglycemia, which are some of the neoplastic clinical manifestations were also presented by this patient. Besides, liver neoplasm, spleen neoplasm and biliary sludge were the sonogram findings of this patient. The liver and spleen neoplasm was observed stable, while the biliary sludge volume fluctuated. The treatment strategy recorded is Ondansetron, Samylin®, Ornipural and Ursodeoxycholic acid.
Keyword: Blood biochemistry profile, Hematology, Liver Neoplasia, Shih Tzu, Ultrasonography