scholarly journals The Implementation of the RC4 algorithm For Sale and Purchase Agreements Data Security On Notary Office

Author(s):  
Trisna Setiawaty ◽  
Olven Manahan

Ksecurity wheel is one of the essential needs of the data, or information. With this regard the importance of the information or data by the party or person of interest. This research aims to design and build a system for data security deed of sale that can help the Notary / PPAT. The system was built using the RC4 (Rivest Code 4) which is a symmetric key cryptographic algorithms and is stream cipher, there is a process of encryption and decryption. The encryption is the process of encoding the original message or plaintext into ciphertext encrypted text. While decryption is the process of encoding back to cipherteksmenjadiplainteks (original data). This research resulted in a system that is able to change the data that can be read into the data that is not easily understood.

2017 ◽  
Author(s):  
Andysah Putera Utama Siahaan

This study combines classic and modern cryptographic algorithms so that the data security of information more awake authenticity. Caesar cipher is the oldest classical cryptography which uses a symmetric key method is the key used for encryption is the same as the key used for the decryption process. Three-Pass Protocol is one of the modern cryptography where the process of sending a message does not need to distribute the key so that each party both the recipient and sender of the message does not need to know each lock. In this combination of receiving and sending messages using the Caesar Cipher algorithm for encryption and decryption, while for its delivery process using algorithms Three Pass protocol. The results from the combination of the two algorithms are to help the information sent is secure.


Author(s):  
Kaldius Ndruru ◽  
Putri Ramadhani

Security of data stored on computers is now an absolute requirement, because every data has a high enough value for the user, reader and owner of the data itself. To prevent misuse of the data by other parties, data security is needed. Data security is the protection of data in a system against unauthorized authorization, modification, or destruction. The science that explains the ways of securing data is known as cryptography, while the steps in cryptography are called critical algorithms. At this time, there are many cryptographic algorithms whose keys are weak especially the symmetric key algorithm because they only have one key, the key for encryption is the same as the decryption key so it needs to be modified so that the cryptanalysts are confused in accessing important data. The cryptographic method of Word Auto Key Encryption (WAKE) is one method that has been used to secure data where in this case the writer wants to maximize the encryption key and description of the WAKE algorithm that has been processed through key formation. One way is to apply the algebraic pascal triangle method to maximize the encryption key and description of the WAKE algorithm, utilizing the numbers contained in the columns and rows of the pascal triangle to make shifts on the encryption key and the description of the WAKE algorithm.Keywords: Cryptography, WAKE, pascal


Author(s):  
Sabitha S ◽  
Binitha V Nair

Cryptography is an essential and effective method for securing information’s and data. Several symmetric and asymmetric key cryptographic algorithms are used for securing the data. Symmetric key cryptography uses the same key for both encryption and decryption. Asymmetric Key Cryptography also known as public key cryptography uses two different keys – a public key and a private key. The public key is used for encryption and the private key is used for decryption. In this paper, certain asymmetric key algorithms such as RSA, Rabin, Diffie-Hellman, ElGamal and Elliptical curve cryptosystem, their security aspects and the processes involved in design and implementation of these algorithms are examined.


2021 ◽  
Vol 58 (1) ◽  
pp. 3420-3427
Author(s):  
P. A. S. D. Perera, G. S . Wijesiri

The present-day society depends heavily on digital technology where it is used in many applications such as banking and e-commerce transactions, computer passwords, etc. Therefore, it is important to protect information when storing and sharing them. Cryptography is the study of secret writing which applies complex math rules to convert the original message into an incomprehensible form.  Graph theory is applied in the field of cryptography as graphs can be simply converted into matrices There are two approaches of cryptography; symmetric cryptography and asymmetric cryptography. This paper proposes a new connection between graph theory and symmetric cryptography to protect the information from the unauthorized parties. This proposed methodology uses a matrix as the secret key which adds more security to the cryptosystem. It converts the plaintext into several graphs and represents these graphs in their matrix form. Also, this generates several ciphertexts. The size of the resulting ciphertexts are larger than the plaintext size.


2021 ◽  
Vol 6 (2) ◽  
pp. 94-102
Author(s):  
Muslih Muslih ◽  
Abdussalam Abdussalam ◽  
Elkaf Rahmawan Pramudya

The main purpose of using cryptography is to provide the following four basic information security services. One of the purposes of cryptography is secrecy. Confidentiality is the fundamental security service provided by cryptography. This is a security service that stores information from unauthorized persons. Confidentiality can be achieved through a variety of ways ranging from physical security to the use of mathematical algorithms for data encryption. Vernam cipher is a stream cipher where the original data or plain with 8x8 block operation. Experimental results prove that RC4 can perform encryption and decryption with a fast execution process. In this study used a processor with 8GB of RAM. The encryption result of the text used yields the average encryption time and decryption average of 2 second.


2015 ◽  
Vol 3 (2) ◽  
pp. 244
Author(s):  
Balajee Maram ◽  
Y Ramesh Kumar ◽  
K Lakshmana Rao

<p>In this research paper, a novel and strong symmetric key cryptography algorithm is proposed. NARSKCA is based on several symmetric cryptographic algorithms. NARSKCA is very simple that uses character converting algorithm, Fibonacci Number Series, Lucas Number series and bitwise XOR. In NARSKCA, 32 files are shared-secret files plays a vital role in this Proposed Algorithm. The Sub-keys are generated from those 32 shared-secret files which are useful in different rounds of Encryption and Decryption Process. The most important feature is the calculation of the final key from the Sub-Keys for each Text-Block. Key Generation, encryption/decryption schemes of NARSKCA are fast and difficult to predict by Cryptanalysts.</p>


Author(s):  
Grace Lamudur Arta Sihombing

Confidentiality of data is very important in communication. Many cyber crimes that exploit security holes for entry and manipulation. To ensure the security and confidentiality of the data, required a certain technique to encrypt data or information called cryptography. It is one of the components that can not be ignored in building security. And this research aimed to analyze the hybrid cryptography with symmetric key by using a stream cipher algorithm and asymmetric key by using RSA (Rivest Shamir Adleman) algorithm. The advantages of hybrid cryptography is the speed in processing data using a symmetric algorithm and easy transfer of key using asymmetric algorithm. This can increase the speed of transaction processing data. Stream Cipher Algorithm using the image digital signature as a keys, that will be secured by the RSA algorithm. So, the key for encryption and decryption are different. Blum Blum Shub methods used to generate keys for the value p, q on the RSA algorithm. It will be very difficult for a cryptanalyst to break the key. Analysis of hybrid cryptography stream cipher and RSA algorithms with digital signatures as a key, indicates that the size of the encrypted file is equal to the size of the plaintext, not to be larger or smaller so that the time required for encryption and decryption process is relatively fast.


2018 ◽  
Author(s):  
Andysah Putera Utama Siahaan

Encryption is needed in the digital world. It can help users to secure confidential information that will be sent. Many algorithms can be used to do that. RC4 or Rivest Cipher 4 made by Ron Rivest is a synchronous type of stream cipher that is a cipher that has a symmetric key and encrypts or decrypts plaintext bits per bit by performing XOR operations with a number generated on S-BOX. RC4 can be run with variable key lengths and operate with byte orientation. RC4 encryption method has weaknesses. One of the disadvantages of RC4 is that the attacker can know the sample or the entire plaintext of the ciphertext without having to know the encryption key. RC4 merger with Adler32 will help improve data security. Adler32 still has weaknesses. Although these weaknesses are rare, if a third party can combine the values of A and B according to the modified results in the text, changes in information can occur even though the feature value of the hash function has the same value before and after modification. The hash function value can be solved to get the A and B values; then the information will be modified and adjusted to the A and B values. The result is that the information is no longer original while the hash function indicates that the information is still original. However, Adler32 is very helpful when combined with RC4 where both algorithms work together to improve the security and validity of a document.


2018 ◽  
Vol 11 (2) ◽  
pp. 177-186
Author(s):  
Desi Nurnaningsih ◽  
Angga Aditya Permana

ABSTRAKData sangatlah berharga bagi semua pengguna komputer, belakangan ini kriptografi menjadi metode yang digunakan dalam mengamankan data. Kriptografi adalah ilmu yang mempelajari teknik-teknik matematika dalam mengamankan suatu informasi atau pesan asli (Plainteks) menjadi sebuah teks tersembunyi (Chiperteks) dan kemudian di ubah menjadi pesan asli kembali. Kriptografi mempunyai tiga unsur penting yaitu pembangkitan kunci, enkripsi dan deskipsi. Dalam kriptografi di kenal algoritma block chiper yang didalamnya terdapat AES (Anvanced Encyption Standard) merupakan bagian dari Modern Symmetric Key Cipher, algoritma ini menggunakan kunci yang sama pada saat proses enkripsi dan deskripsi sehingga data yang kita miliki akan sulit dimengerti maknanya. Teknik algoritma tersebut digunakan untuk mengkonversi data dalam bentuk kode-kode tertentu, untuk tujuan agar informasi yang tersimpan tidak bisa di baca siapa pun kecuali orang-orang yang berhak. Oleh karena itu, sistem keamanan data sangat di perlukan untuk menjaga kerahasian informasi agar tetap terjaga. ABSTRACTData is a valueable  for all computer users, cryptography is the one of  method used to securing data. Cryptography is the study of mathematical techniques in securing an information or original message (Plainteks) into a hidden text (Chiperteks) and then converted into the original message again. Cryptography has three important elements, first is key generation, second is encryption and latetly is description. In cryptography known as cipher block algorithms in which AES (Advanced Encyption Standard) is part of Modern Symmetric Key Cipher, this algorithm uses the same key during the encryption and description process so that the data we have will be difficult to understand. The algorithm technique is used to convert data in the form of certain codes, so that the information stored cannot be read by anyone except those who are entitled. Therefore, the data security system is very necessary to maintain the confidentiality of information. 


Author(s):  
Meenakshi R. K ◽  
A. Arivazhagan

<p>The demand of satellite communication, the security algorithms are to be designed in the board. The information from the satellite to the ground is required the data security with the cryptographic algorithms. Advanced encryption standard (AES) is one of the promising cryptographic algorithms for the terrestrial communication. In this paper, the encryption and decryption is mainly focused on the cipher block chaining (CBC) mode for achieving the high secured data transmission. For efficient data transmission, the AES algorithm is implemented by using CBC mode. The proposed work is designed by using RTL modeling and also the minimum numbers of logical elements are used for implementation. </p>


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