Judul: Analisis hasil enkripsi file wave menggunakan sandi algoritme berkelamp-massey
Abstrak: Secured voice data transfer is an important thing to be noticed, especially when dealing with confidential data. A technique used in assuring the transfer is encrypting the data. This technique applied symmetric key stream cipher Left Feedback Shift Register (LFSR) generator. The key developed by LFSR generator also contains high level of safety because it has semirandom byte stream key with large period. However, the influence of voice encryption using LFSR symmetric key to the wave format files is not widely known. Besides, this technique's safety level must be examined further as a consideration for larger use. This research tends to test the impact of encryption using LFSR symmetric key stream cipher on voice recorded as wave file format, and its safety level. Wave files employed on this research recorded using Sound Recorder application on Windows Operation System. These files have various fast and slow rythm. The result of this research was the change on the voice after being encrypted, with different intensity of noise, that will affect the clarity of voice's message contents. Some voices have message that could be identified well, and others couldnn't be identified at all. The result of the analysis showed that the factors influence the encryption were the rythm of the voice, and the type of polynomial applied (primitive / non primitive; polynomial degree, and linear complexity measured by Berlekamp- Massey Algorithm). Furthermore, the encrypted voices could be recovered to their genuine source while the key to decrypt is similar with the encryption key.
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Judul: Penyandian File Teks Menggunakan Algoritma AES (Advanced Encryption Standard)
Abstrak: Perkembangan teknologi dan informatika saat ini sangatlah pesat, sehingga diperlukan adanya kriptografi sebagai upaya pengamanan data. Algoritma Advanced Encryption Standard (AES) termasuk ke dalam sistem kriptografi modern yang simetris. Algoritma AES yang umum dipakai saat ini adalah AES-128, AES-192 dan AES-256. Penelitian ini merekonstruksi tahapan-tahapan algoritma AES baik secara teknis implementasi maupun konsep matematika yang digunakan, serta menerapkan algoritma AES dalam penyandian file teks dan mengukur run-time algoritma tersebut. Algoritma AES diawali dengan mengubah plaintext menjadi sejumlah blok teks berukuran 128 bit, serta melakukan proses key scheduling untuk memperoleh sejumlah round key. Proses enkripsi meliputi AddRoundKey dengan menggunakan round key yang telah diperoleh, ShiftRows, SubBytes dan MixColumn sebanyak beberapa putaran. Proses dekripsi AES merupakan kebalikan dari proses enkripsi. Proses-proses pada algoritma AES terjadi di sebuah lapangan yang disebut Galois Field (GF(2^8)). Berdasarkan hasil yang diperoleh, waktu yang diperlukan untuk mengenkripsi dan dekripsi file meningkat secara linear tergantung pada ukuran file., The current development of technology and informatics has been advanced rapidly, hence the need for cryptography as an effort to secure data. The Advanced Encryption Standard (AES) algorithm belongs to the category of modern symmetric cryptography. The commonly used AES algorithms today are AES-128, AES-192, and AES-256. This research reconstructs the stages of the AES algorithm, both in technical implementation and the mathematical concepts employed. It also applies the AES algorithm in encoding text files and measures the algorithm's run-time. The AES algorithm starts by converting plaintext into a series of text blocks, each sized at 128 bits. It also undergoes a key scheduling process to obtain a set of round keys. The encryption process involves AddRoundKey using the obtained round key, followed by ShiftRows, SubBytes, and MixColumn for several rounds. The decryption process in AES is the reverse of the encryption process. These processes in the AES algorithm occur in a field known as Galois Field (GF(2^8)). Based on the obtained results, the time required for encrypting and decrypting files increases linearly depending on the file size.
Keyword: AES, algorithm, cryptography, Galois Field, security

Judul: Pengusahaan tanaman tebu di pabrik gula ngadiredjo Kediri, PTP XXI - XXII ( Persero ) Jawa Timur
Abstrak: Tebu merupakan salah satu tanaman yang dapat menghasilkan gula. Menurut Wilsie (1962) kira-kira 60% dari produksi gula dunia berasal dari tebu dan 40% berasal dari bit gula. Univer Tanaman tebu tumbuh di daerah tropika dan subtropika di sekitar katulistiwa sampai batas garis isoterm 20° C, yakni 39° garis lintang utara dan 35 lintang selatan. Tanaman tebu dapat tumbuh dari pantai sampai ke dataran tinggi 1 400 m di atas permukaan laut (dpl) (Notojoewono, 1964). Produksi gula Indonesia akhir Pelita II (1978) masih belum dapat memenuhi kebutuhan, sehingga masih harus meng- import sebesar 350 000 ton (Saputro, 1979). Dengan bertambahnya penduduk dan bertambahnya tingkat kemakmuran, kebutuhan gula makin bertambah. Pada akhir Pelita III (1983) kebutuhan gula untuk konsumsi dalam negeri diperkirakan sebesar 1.8 juta ton. Kebutuhan ini diperkirakan untuk konsumsi penduduk sebesar 150 901 000 jiwa dengan kebutuhan gula perkapita per tahun sebesar 12 kg (Anonim, 1978, dalam Yogasara, 1979). ...
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