開発スタッフがアプリ関連の最新技術やニュースをご紹介します。

In today’s interconnected world, the internet plays a crucial role in our daily lives. However, it’s important to be aware of potential threats that can compromise our online safety. One such threat is DNS poisoning. Today, I will explain what DNS poisoning is, its potential risks, and provide you with some easy-to-follow precautions to safeguard yourself against it.

What is DNS Poisoning?

DNS (Domain Name System) is like the phone book of the internet, translating human-friendly domain names into machine-readable IP addresses. DNS poisoning, also known as DNS spoofing, is an attack where Cyber criminals manipulate the DNS records to redirect users to malicious websites. Essentially, it tricks your computer or device into connecting to a fraudulent or dangerous destination instead of the legitimate website you intended to visit.

Risks of DNS Poisoning

The consequences of falling victim to DNS poisoning can be severe. Here are some potential risks:

1. Phishing Attacks: Cyber criminals can redirect you to fake websites that imitate legitimate ones, aiming to steal your sensitive information such as login credentials, credit card details, or personal data.

2. Malware Infections: By redirecting your traffic, attackers can make you unknowingly download and install malware on your device. This malware can compromise your system’s security and lead to data breaches or other harmful activities.

3. Financial Loss: If you mistakenly enter your financial information on a spoofed website, hackers can gain unauthorized access to your accounts and exploit your finances.

Precautions against DNS Poisoning

The risk of falling victim to such attacks can be significantly reduced by taking the following a few simple precautions .

1. Use a Reliable DNS Service: Ensure you use a reputable and trustworthy DNS service provider. Research and choose a service known for its security measures and reliability.

2. Keep Your System Updated: Regularly update your operating system, web browsers, and other software. These updates often include security patches that address vulnerabilities exploited by attackers.

3. Enable DNSSEC: DNSSEC (Domain Name System Security Extensions) is a security protocol that adds an additional layer of authentication to DNS records. Enable DNSSEC if your DNS service provider supports it.

4. Utilize a Firewall: A firewall acts as a barrier between your device and potential threats. Configure your firewall to filter incoming and outgoing traffic, providing an added layer of protection.

5. Be cautious of suspicious Links and Emails in the case of clicking on links in emails, messages, or on unfamiliar websites.

Conclusion

Maintaining online safety is crucial in today’s digital life. So by understanding DNS poisoning and following these straightforward precautions, you can significantly reduce the risk of falling victim to such attacks.

This is all for now. Hope you enjoy that.

By Asahi

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Elon Musk says he has found a new CEO for Twitter.

Musk didn’t say who would replace him, but the Wall Street Journal now reports that NBCUniversal communications director Linda Yaccarino is “in talks” for the role. . In a tweet, Musk announced that he would be transitioning from his role as CTO. The new CEO is expected to take over within six weeks.

Musk bought the twitter for $44 billion in October last year, after originally proposing an acquisition in April 2022. Once the deal was completed, he took over as CEO and quickly fired former Twitter CEO and other executives. He then laid off half of the staff in November.

Musk has previously said he plans to step down as CEO by the end of 2023 and appoint a new chief executive, saying he will respect the findings of the investigation as to whether he should remain in charge of the company. But so far he has not nominated a candidate.

During his time as CEO, Musk overhauled Twitter’s policies and features, prompting several major advertisers to stop spending on the twitter.

Musk’s decision to appoint Twitter’s new CEO should appease Tesla investors who fear that his time on Twitter is distracting him from his role as CEO of Tesla. Musk will soon step down as CEO of Twitter, but he remains the company’s owner. Musk recently changed the name of Twitter to Company X.

Yuuma

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Today, I would like to share how to rotate and crop the images in Python using opencv.

Rotating and cropping are common image processing techniques used to manipulate digital images. Python OpenCV is a powerful library for image processing that provides numerous tools for image manipulation. In this tutorial, we will learn how to rotate and crop images using Python OpenCV.

1. Installing OpenCV

First, we need to install OpenCV in our system. If you haven’t installed OpenCV yet, you can install it using pip:

pip install opencv-python

2. Loading an Image

After installing OpenCV, we can load an image using the imread() function. The imread() function takes the image file path as an argument and returns an array representing the image.

import cv2

# Load image

image = cv2.imread('path/to/image.jpg')

3. Rotating an Image

Rotating an image involves changing the orientation of the image. We can use the cv2.rotate() function to rotate an image. The cv2.rotate() function takes three arguments: the image, the rotation type, and the angle of rotation.

# Rotate image

rotated_image = cv2.rotate(image, cv2.cv2.ROTATE_90_CLOCKWISE)

In the above example, we have rotated the image 90 degrees clockwise.

4. Cropping an Image

Cropping an image involves selecting a portion of the image and discarding the rest. We can use array slicing to crop an image. The array slicing notation is [start_row:end_row, start_column:end_column].

# Crop image

cropped_image = image[start_row:end_row, start_column:end_column]

In the above example, we have cropped the image from start_row to end_row and start_column to end_column.

5. Displaying Images

After rotating or cropping an image, we can display the images using the cv2.imshow() function. The cv2.imshow() function takes two arguments: the name of the window and the image.

# Display images

cv2.imshow('Original Image', image)

cv2.imshow('Rotated Image', rotated_image)

cv2.imshow('Cropped Image', cropped_image)

# Wait for a key press and close all windows

cv2.waitKey(0)

cv2.destroyAllWindows()

6. Saving an Image

We can save the rotated or cropped image using the cv2.imwrite() function. The cv2.imwrite() function takes two arguments: the name of the file and the image.

# Save image

cv2.imwrite('path/to/saved/image.jpg', rotated_image)

In the above example, we have saved the rotated image to a file named ‘saved_image.jpg’ in the specified path.

Conclusion

In this tutorial, we have learned how to rotate and crop images using Python OpenCV. We have also learned how to display and save images. These are just a few of the many image processing techniques that can be performed using OpenCV. With OpenCV, we can perform a wide range of image processing tasks, from simple operations like cropping and rotating to more complex operations like edge detection and object recognition.

This is all for now. Hope you enjoy that.

By Asahi

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Hugging Face, an AI startup backed by tens of millions of venture capitalists, has released an open-source alternative to OpenAI’s AI-powered viral chatbot ChatGPT called HuggingChat.

HuggingChat can be tested via a web interface or integrated with existing apps and services via the Hugging Face API. HuggingChat can handle many of the same tasks as ChatGPT, such as writing code, writing emails, and writing song lyrics.

The AI model that powers HuggingChat was developed by Open Assistant. This is a project sponsored by LAION, a German non-profit organization responsible for creating the datasets on which Stable Diffusion, a text-to-image AI model, was trained.

HuggingChat joins a growing family of open source alternatives to ChatGPT. Last week, Stability AI released StableLM. This is a suite of models that can generate code and text with basic instructions.

Some researchers have criticized the release of open source models similar to StableLM in the past, claiming they are flawed and can be used for malicious purposes such as crafting phishing emails. claim. However, some point out that many of the policed business models like ChatGPT, with their filtering and moderation systems, have proven to be flawed and exploitable.

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Today, we will explore how to create client and server sockets using Python, along with an example code.

Client and server sockets are a fundamental part of network communication in computer science. A socket is essentially an endpoint that enables two-way communication between two devices over a network.

Server Socket

The server socket is a program that listens for incoming connections from clients. Once a connection is established, the server creates a new socket object to handle the communication with the client. Here is a basic example of a server socket program in Python:

import socket

HOST = '127.0.0.1'  # Standard loopback interface address (localhost)
PORT = 65432        # Port to listen on (non-privileged ports are > 1023)

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.bind((HOST, PORT))
    s.listen()
    conn, addr = s.accept()
    with conn:
        print('Connected by', addr)
        while True:
            data = conn.recv(1024)
            if not data:
                break
            conn.sendall(data)

In the above code, we first import the socket module and define the IP address and port number for the server. Then we create a new socket object ‘s’ using the AF_INET address family and SOCK_STREAM socket type.

We then bind the socket to our defined IP address and port number, and start listening for incoming connections using the s.listen() method. Once a client connects, the s.accept() method returns a new socket object ‘conn’ representing the connection, along with the address of the client.

We then use a while loop to continuously receive data from the client using conn.recv() and send data back to the client using conn.sendall() until there is no more data to receive.

Client Socket

The client socket is a program that initiates a connection to the server socket. Here is a basic example of a client socket program in Python:

import socket

HOST = '127.0.0.1'  # The server's hostname or IP address
PORT = 65432        # The port used by the server

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((HOST, PORT))
    s.sendall(b'Hello, world')
    data = s.recv(1024)

print('Received', repr(data))

In the above code, we again import the socket module and define the IP address and port number for the server. We then create a new socket object ‘s’ using the AF_INET address family and SOCK_STREAM socket type.

We then initiate a connection to the server using s.connect() and send data to the server using s.sendall(). Finally, we receive data from the server using s.recv() and print the received data.

Conclusion

We have explored how to create client and server sockets using Python along with a basic example code. Sockets are a powerful tool for network communication and are used extensively in a wide range of applications. With the above knowledge, you can build complex network applications in Python.

This is all for now. Hope you enjoy that.

By Asahi

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