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Encryption and decryption class library

Symmetric encryption algorithm class provided by php

Encryption and decryption class library

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Symmetric encryption algorithm class provided by php Share a symmetric encryption algorithm class provided by PHP. KEY is a previously defined constant Mcrypt::encrypt(); Mcrypt::decrypt();

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Solving the problem of empty string after Python AES encryption and decryption

03 Dec 2025

This article aims to solve the problem of getting an empty string after decryption when using Python's Crypto library for AES encryption and decryption. By analyzing common causes and providing repaired code examples, we help developers correctly implement AES encryption and decryption functions to ensure safe data transmission and storage.

Python cryptography.fernet implements file encryption and decryption tutorial

14 Nov 2025

This tutorial details how to use the fernet module in Python's cryptography library to implement file encryption and decryption operations. The article will cover the generation, management and reuse of Fernet keys, as well as how to securely perform encryption and decryption processes in files, and emphasize the importance of secure storage of keys to ensure data confidentiality.

How to encrypt and decrypt files in Python

26 Nov 2025

Fernet using the cryptography library can safely implement Python file encryption and decryption. 2. Generate and securely store keys for encryption and decryption processes. 3. When encrypting, read the file content and write it into the .enc file, and when decrypting, restore the original file. 4. Pay attention to key security management and avoid hard coding or submitting to version control. 5.Fernet is based on AES and HMAC and is suitable for most scenarios, but streaming processing of large files needs to be considered.

Using Forge AES to solve partial decryption problems: understanding and managing padding mechanisms

11 Dec 2025

This article aims to solve the problem of partial decryption of text due to the default padding mechanism when using the Forge library for AES decryption. It provides an in-depth analysis of the padding principle of block ciphers, especially the default behavior of PKCS#7 padding in the Forge library, and provides specific code examples showing how to ensure complete decryption by disabling Forge's automatic depadding feature. At the same time, the article emphasizes the insecurity of ECB mode, key derivation vulnerabilities and the importance of authenticated encryption, providing developers with a comprehensive set of solutions and security practice guidelines.

PHP implements AES-ECB file decryption: Python to PHP porting guide

30 Dec 2025

This article provides detailed guidance on how to transplant the AES-ECB file decryption logic based on the PyCryptodome library in Python to the PHP environment. It focuses on analyzing key derivation, chunked reading and writing, and deeply explores the most common pitfall in cross-language implementation-the difference in encryption padding modes. By comparing the behavior of Python's unpad mechanism and the OPENSSL_ZERO_PADDING flag of PHP's openssl_decrypt function, an accurate PHP decryption implementation solution is provided to ensure that files can be decrypted correctly and avoid errors such as "wrong final block length".

Fix Padding Issues in Password Managers

01 Dec 2025

This article aims to solve the problem of decryption failure due to incorrect Padding when using Python's Crypto library for AES encryption. By introducing custom Padding and Unpadding methods, combined with sample code, it shows in detail how to correctly encrypt and decrypt passwords and store them securely in text files. At the same time, suggestions for improvements to the code structure and potential security risks are also made to ensure the security and reliability of the password manager.