Using OpenSSL for hashing and verifying the hashes of a text file

Situatie

Solutie

Part 1: Creating a Hash of a Text File with OpenSSL

-Enter the cat Secret_message to display the contents of the file on the screen

cat Secret_message

-Run the following command to hash the text file.

openssl sha256 Secret_message

This command will use the SHA-256 hashing algorithm to generate a hash of the text file, and the result will be displayed on the screen once OpenSSL completes the computation.

Tip solutie

Permanent

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Part 2: Verifying Hashes

-Let’s edit the Secret_message text file and recalculate the SHA-256 hash. Run the command below to open nano, a command-line text editor.

nano Secret_message

-In nano, change the word “lies” to “dies” on the second line, modifying only one character from ‘l’ to ‘d’. After making the change, save the modified file.

-After modifying and saving the file, run the same command again to generate the SHA-256 hash of the updated file.

openssl sha256 Secret_message

The smallest change results in a completely different hash. Hashes can be calculated before and after transmission, and then compared. If the hashes do not match, then data was modified during transmission.

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