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Symmetric Encryption and Decryption with a key file

Generate a random 256-bit key

To generate a random 256-bit key using /dev/urandom, you can directly extract the random data without the need for additional hashing. Here’s how you can do it:

$ dd if=/dev/urandom of=/path/to/your/keyfile bs=1 count=32

In this command:

if=/dev/urandom specifies the input source as /dev/urandom.
of=/path/to/your/keyfile specifies the output file where your key will be saved.
bs=1 sets the block size to 1 byte.
count=32 specifies that we want 32 bytes (256 bits) of random data.

$ dd if=/dev/urandom of=symmetric_keyfile.key bs=1 count=32


We can use this command to encrypt the sample.txt file:
$ openssl enc -in sample.txt -out sample.txt.enc -e -aes256 -pbkdf2 -kfile symmetric_keyfile.key


$ openssl enc -in sample.txt.enc -out sample_decrypted.txt -d -aes256 -pbkdf2  -kfile symmetric_keyfile.key


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