Iraqi Journal of Information and communication technology

Shannon defines perfect secrecy for a cryptographic system as such a cryptographic system in which the ciphertext yields no possible information about the plaintext. Diffie and Hellman suggest computationally secure cryptographic systems even if the intercepted data contains sufficient information to allow a unique solution to the cryptographic problems. In this paper, we present a new idea to cipher data with a perfect secrecy properties based on the chaotic maps for generating a one-time random key used to encrypt text data. The output of ciphertextprocess has been examined and shows perfect random properties, ideal performance and throughput comparedwith block cipher systems

Chain of custody plays an important role to determine integrity of digital evidence, because the chain
of custody works on a proof that evidence has not been altered or changed through all phases, and must include
documentation on how evidence is gathered, transported, analyzed and presented.
The aims of this work is first to find out how the chain of custody has been applied to a wide range of models of the
digital forensic investigation process for more than ten years. Second, a review of the methods on digitally signing
an evidence that achieves the successful implementation of chain of custody through answering a few questions
\\"who, when, where, why, what and how\\", and thus providing digital evidence to be accepted by the court. Based
on the defined aims, an experimental environment is being setup to outline practically an acceptable method in
chain of custody procedure. Therefore, we have adopted SHA512 for hashing and regarding encryption RSA and
GnuGP is applied where according to the defined requirement a combination of these algorithms could be adopted
as a practical method.

In this paper, we designed a system that extract citizens opinion about Iraqis government and Iraqis
politicians through analyze their comments from Facebook (social media network). People express their opinion in
a random way so extract cleared pattern form their comments need several pre-processing steps, first, we cleaned
the dataset by remove special characters, normalize the letters that written in different shape and remove repeated
characters. Also, a stemmer specializes for Iraqi dialect was built to stem the vocabulary as much as possible, this
is the first attempt to build stemmer for Iraqis dialect. Cleaning and stemming reduce the number of vocabulary
in our dataset from 28968 to 17083, these reductions caused reduction in memory size from 382858 bytes to 197102
bytes. Generally, there are two approaches to extract users opinion; namely, lexicon-based approach and machine
learning approach. In our work, machine learning approach is applied with three machine learning algorithm which
are; Naive base, K-Nearest neighbor and AdaBoost ensemble machine learning algorithm. For Naive base, we
apply two models; Bernoulli and Multinomial models. We found that, Naive base with Multinomial models give
highest accuracy.

The huge development and use of digital multimedia (video, image) over computer networks has led to increase the need for securing of these digital data. Video encryption is widely used as a method for providing security for digital video. In this paper video encryption method is developed using chaotic system for key generator and stream cipher, it uses chaotic map as one-time key generator which produce key used for encryption process. Chaotic systems have been successfully used for multimedia encryption. Chaotic cryptography have good characteristic such as pseudo-randomness, and sensitivity to initial conditions. Video encryption method have successfully designed and implemented, the tests and analysis results have showed the succeed of the encryption method in term of speed and security

Network security role grew exponentially in the late several years, especially with the notable amount
of attacks that target all types of organizations and services. Thus, the need for more research on efficient and
open source perimeter defense system and packet analysis and are rising. Intrusion detection system and firewall
can afford significate role in protecting networks by detecting, reporting and blocking malicious behaviors. In this
paper, an open source-based model was introduced that can provide security monitoring and logging, intrusion
detection and prevention, firewall services and packet inspection and analysis. The proposed design provide high
visibility and add a security layer to networks and data centers with many use cases such as: network forensics,
security analysis, and production deployment. All the components and software were deployed with virtualization
and container-based technology to get the benefits of these technologies like cost-effective, cloud applicable, and
flexible deployment across many hardware requirements. Tests were performed to verify the performance of the
implemented model. The results show that the proposed design presents detection capability of the attacks and
visualization of the network traffic with security controls.