Encrypt and Decrypt Files With Password Using OpenSSL

Blockchain technology offers decentralized and secure solutions for various applications, including data storage and transfer. One of the essential aspects of data security is encryption. In this article, we will explore how to encrypt and decrypt files using OpenSSL, a widely used open-source cryptographic library, in the context of blockchain.

Understanding Encryption and Decryption:

Encryption involves transforming plain text or data into an unreadable format called ciphertext, accomplished through the utilization of an encryption algorithm and a secret key or password. This measure guarantees that solely authorized individuals can access and comprehend the encrypted information. Conversely, decryption is the inverse process of converting ciphertext back into its original form using the same key or password.

Using OpenSSL for File Encryption and Decryption:

OpenSSL is a powerful cryptographic library that provides a wide range of encryption algorithms and functions. It is available for various operating systems and programming languages, making it accessible and widely used in the blockchain community. Here’s a step-by-step guide on how to encrypt and decrypt files using OpenSSL with a password:

Step 1: Install OpenSSL:

First, ensure that OpenSSL is installed on your system. To acquire OpenSSL can be downloaded from its official website or utilize operating system-specific package managers.

Step 2: Generate a Password:

When encrypting and decrypting your files, it is crucial to select a robust and secure password. An ideal password should possess characteristics such as length, complexity, and a mixture of uppercase and lowercase letters, numbers, and special characters. Remember to keep your password confidential and secure.

Step 3: Encrypt the File:

To begin, access the terminal or command prompt and navigate to the directory where the file is situated. Use the following command in php:

openssl enc -aes-256-cbc -salt -in <input_file> -out <output_file> -k <password>

Replace <input_file> with the name of the file you want to encrypt and <output_file> with the desired name for the encrypted file. <password> should be replaced with the password you generated in the previous step.

Step 4: Decrypt the File:

To decrypt the encrypted file, use the following command in php:

openssl enc -aes-256-cbc -d -in <encrypted_file> -out <decrypted_file> -k <password>

Replace <encrypted_file> with the name of the encrypted file and <decrypted_file> with the desired name for the decrypted file. <password> should be the same password used for encryption.

The Significance in Blockchain:

Encryption and decryption of files play a crucial role in blockchain applications, especially when it comes to securing sensitive data and maintaining privacy. By encrypting files before storing them on a blockchain network, data confidentiality is ensured. Only authorized parties with the correct password can decrypt and access the information.

This level of encryption adds an extra layer of security to blockchain networks, preventing unauthorized access and protecting the integrity of the stored data. It enhances trust and confidence in the system, making blockchain technology a reliable solution for secure data storage and transfer.


Encrypting and decrypting files using OpenSSL and a strong password is a vital practice for ensuring data security and privacy in the blockchain ecosystem. By following the comprehensive instructions outlined in this article, you can encrypt your files with a password, harnessing the strength of encryption to protect confidential information within blockchain applications.

Explore more articles like this.

Leave a comment