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OPENSSL CLI ENCRYPTION USING AES-256-CBC: A DEEP DIVE

Abstract: In this article, we will explore how to use OpenSSL on the command
line to encrypt data using the AES-256-CBC algorithm.

2024-01-26 by DevCodeF1 Editors



OPENSSL CLI ENCRYPTION USING AES-256-CBC: A DEEP DIVE

OpenSSL is a powerful tool for encryption and decryption tasks. This article
focuses on using OpenSSL from the command line to encrypt and decrypt data using
the AES-256-CBC cipher. We will cover the following topics:

 * Key concepts of OpenSSL and AES-256-CBC
 * Generating a secret key and IV
 * Encrypting data with OpenSSL
 * Decrypting data with OpenSSL
 * Summary and references


KEY CONCEPTS OF OPENSSL AND AES-256-CBC

OpenSSL is an open-source toolkit for the Transport Layer Security (TLS)
protocol and Secure Sockets Layer (SSL) protocol. It is widely used for
implementing cryptographic protocols and algorithms.

AES (Advanced Encryption Standard) is a symmetric encryption algorithm that is
widely used across the globe. AES-256 is the variant with a 256-bit key size.
CBC (Cipher Block Chaining) is a mode of operation for a block cipher.


GENERATING A SECRET KEY AND IV

To generate a secret key and an Initialization Vector (IV), we can use the
following command:

openssl rand -out secret.key 32

This command generates a 256-bit key (32 bytes) and saves it to a file named
secret.key.

To generate an IV, we can use the following command:

openssl rand -out iv.bin 16

This command generates a 128-bit IV (16 bytes) and saves it to a file named
iv.bin.


ENCRYPTING DATA WITH OPENSSL

To encrypt data with OpenSSL, we can use the following command:

echo "secret message" | openssl enc -aes-256-cbc -salt -in - -K $(cat
secret.key) -iv $(cat iv.bin) -out encrypted.bin

This command reads data from standard input (in this case, the string "secret
message"), encrypts it using the AES-256-CBC cipher with the key from secret.key
and the IV from iv.bin, and saves the encrypted data to a file named
encrypted.bin.


DECRYPTING DATA WITH OPENSSL

To decrypt data with OpenSSL, we can use the following command:

openssl enc -aes-256-cbc -d -in encrypted.bin -K $(cat secret.key) -iv $(cat
iv.bin) -out decrypted.txt

This command reads encrypted data from the file encrypted.bin, decrypts it using
the AES-256-CBC cipher with the key from secret.key and the IV from iv.bin, and
saves the decrypted data to a file named decrypted.txt.


SUMMARY AND REFERENCES

In this article, we have covered the basics of using OpenSSL from the command
line to encrypt and decrypt data using the AES-256-CBC cipher. We have also
discussed the key concepts of OpenSSL and AES-256-CBC, as well as the steps to
generate a secret key and IV.

 * OpenSSL Official Website
 * Advanced Encryption Standard (AES) on Wikipedia
 * Cipher Block Chaining (CBC) on Wikipedia

This article was written using the following references:

 * OpenSSL enc command manual page
 * Advanced Encryption Standard (AES) on Wikipedia
 * Cipher Block Chaining (CBC) on Wikipedia

This article was generated using the following command:

echo -e '


OPENSSL CLI ENCRYPTION USING AES-256-CBC: A DEEP DIVE

 * Key concepts of OpenSSL and AES-256-CBC
 * Generating a secret key and IV
 * Encrypting data with OpenSSL
 * Decrypting data with OpenSSL
 * Summary and references


KEY CONCEPTS OF OPENSSL AND AES-256-CBC

OpenSSL is a powerful tool for encryption and decryption tasks. This article
focuses on using OpenSSL from the command line to encrypt and decrypt data using
the AES-256-CBC cipher. We will cover the following topics:

 * Key concepts of OpenSSL and AES-256-CBC
 * Generating a secret key and IV
 * Encrypting data with OpenSSL
 * Decrypting data with OpenSSL
 * Summary and references


GENERATING A SECRET KEY AND IV

To generate a secret key and an Initialization Vector (IV), we can use the
following command:

openssl rand -out secret.key 32

This command generates a 256-bit key (32 bytes) and saves it to a file named
secret.key.

To generate an IV, we can use the following command:

openssl rand -out iv.bin 16

This command generates a 128-bit IV (16 bytes) and saves it to a file named
iv.bin.


ENCRYPTING DATA WITH OPENSSL

To encrypt data with OpenSSL, we can use the following command:

echo "secret message" | openssl enc -aes-256-cbc -salt -in - -K $(cat
secret.key) -iv $(cat iv.bin) -out encrypted.bin

This command reads data from standard input (in this case, the string "secret
message"), encrypts it using the AES-256-CBC cipher with the key from secret.key
and the IV from iv.bin, and saves the encrypted data to a file named
encrypted.bin.


DECRYPTING DATA WITH OPENSSL

To decrypt data with OpenSSL, we can use the following command:

openssl enc -aes-256-cbc -d -in encrypted.bin -K $(cat secret.key) -iv $(cat
iv.bin) -out decrypted.txt

This command reads encrypted data from the file encrypted.bin, decrypts it using
the AES-256-CBC cipher with the key from secret.key and the IV from iv.bin, and
saves the decrypted data to a file named decrypted.txt.


SUMMARY AND REFERENCES

In this article, we have covered the basics of using OpenSSL from the command
line to encrypt and decrypt data using the AES-256-CBC cipher. We have also
discussed the key concepts of OpenSSL and AES-256-CBC, as well as the steps to
generate a secret key and IV.

 * OpenSSL Official Website
 * Advanced Encryption Standard (AES) on Wikipedia
 * Cipher Block Chaining (CBC) on Wikipedia

This article was written using the following references:

 * OpenSSL enc command manual page
 * Advanced Encryption Standard (AES) on Wikipedia
 * Cipher Block Chaining (CBC) on Wikipedia

' > article.html


LEARN THE STEPS TO ENCRYPT DATA USING OPENSSL CLI AND AES-256-CBC ALGORITHM IN
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Tags::  OpenSSL Encryption AES-256-CBC CLI




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