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: Aritmetika Field Biner Menggunakan GMP Library dalam Pemrograman Prosedural C
Abstrak: Almost all cryptographic algorithms involve the construction of integer arithmetic operations. The operations is referred to huge operation to an integer value in order to support the level of security of a cryptosystem. Related to this, the arithmetic operations in binary field is needed to construct various cryptographic algorithms. Binary field arithmetic implementation starts with the representation of its members, who then will be done by operating the addition, multiplication, reduction, and inversion. Each operation is simulated in 1024 bit length or more. Unlike the addition of polynomial operations that are directly applicable in the binary field , multiplication operations require reduction step necessary to build . Through experiments conducted for three types of reduction each Trinomial, Pentanomial, and Full Polynomial, apparently Full Polynomials provide the most high-speed reduction.
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Judul: Karakteristik Anatomi Skelet Kepala Buaya senyulong (Tomistoma schlegelii).
Abstrak: Buaya sepit atau senyulong (Tomistoma schlegelii) merupakan jenis buaya asli Indonesia yang berhabitat di sungai-sungai Sumatera, Kalimantan, dan juga pedalaman Sulawesi. Salah satu ciri khas buaya senyulong adalah bentuk moncong yang runcing dan sempit, namun hingga saat ini informasi mengenai struktur skelet kepala buaya senyulong sangat terbatas. Penelitian ini bertujuan untuk mempelajari karakteristik anatomi skelet kepala buaya senyulong yang dikatikan dengan fungsi dan perilakunya. Penelitian dilakukan secara eksploratif dengan melakukan pengamatan, pencatatan, dan pengambilan gambar dari skelet kepala buaya senyulong. Skelet kepala berukuran panjang 70 cm, lebar 29 cm, dan tingggi 17 cm dengan permukaan kasar pada os nasale, os frontale, os maxilla, os mandibula, os lacrimale, os jugale. Jumlah gigi pada buaya ini sebanyak 78 buah, terdiri dari 4 buah gigi premaxila, 16 buah gigi maxila, dan 19 buah gigi mandibula. Pada regio orbitalis ditemukan dua pasang fenestrae temporales yang berkembang baik. Fenestra supratemporale merupakan lubang oval yang membentang di sepanjang os parietale. Fenestra infratemporale berbentuk segitiga dan dibatasi oleh os squamosum, os postorbitale, os jugulare, dan os quadratum. Os mandibula hewan ini mempunyai symphysis mandibularis yang panjang yaitu garis yang melintang di corpus mandibulae. Secara fungsional ukuran symphysis mandibularis berkaitan dengan adaptasi hewan terhadap diet makan.
Keyword: kepala, moncong, Tomistoma schlegelii