OpenSSL.md

Encrypt and Decrypt Files with OpenSSL

This documentation provides detailed instructions on how to use OpenSSL to encrypt and decrypt text files.

Encrypt a File

openssl enc -aes-256-cbc -salt -in path/to/your/file.txt -out path/to/your/file.enc

Enter a password when prompted. This password will be necessary to decrypt the file.

Decrypt a File

openssl enc -aes-256-cbc -d -in path/to/your/file.enc -out path/to/your/decrypted_file.txt

Enter the password used for encryption when prompted.

OpenSSL

OpenSSL is a suite of tools for communication security and cryptography, used for creating SSL/TLS certificates and for managing various cryptographic functions.

• enc: This OpenSSL option indicates that you are using the encryption function.

• -aes-256-cbc: Specifies the encryption algorithm. AES (Advanced Encryption Standard) with a 256-bit key in CBC (Cipher Block Chaining) mode.

• -salt: Adds "salt" to the encryption key to improve security. The salt ensures that the keys generated are unique even if the same password is used multiple times.

• -in: Specifies the input file (the file you want to encrypt).

• -out: Specifies the output file (where you want the encrypted file to be saved).

• -d: Used during decryption. Indicates to OpenSSL to decrypt the data.

Important Notes

• These commands use the AES-256 algorithm to encrypt and decrypt the file.
• Do not forget the password used for encryption. Without it, you will not be able to access the contents of the encrypted file.
• Before encrypting important files, it is advisable to practice with test files to ensure you understand the process.