How do I encrypt a file with a key?

Question

How to encrypt a big file using OpenSSL and someone's public key Step 0) Get their public key. The other person needs to send you their public key in .pem format. . Step 1) Generate a 256 bit (32 byte) random key. . Step 2) Encrypt the key. . Step 3) Actually Encrypt our large file. . Step 4) Send/Decrypt the files.

Can we encrypt file using private key?

If someone wants to communicate sensitive information with you, you can send them your public key, which they can use to encrypt their messages or files before sending them to you. Private keys are used for decryption. The only way you can decrypt your sender's encrypted message is by using your private key.

Can you encrypt something with a public key?

Only the owner of the private key can encrypt data so that the public key decrypts it; meanwhile, anyone can encrypt data with the public key, but only the owner of the private key can decrypt it.

How do I encrypt a file with RSA key?

Sender will follow these steps:1Generate a 256 (or any non-zero value) bit (32 byte) random password. ... 2Encrypt your file with a random key derived from randompassword. ... 3Encrypt your random password using recipient's RSA public key. ... 4Send both randompassword.encrypted and big-file.pdf.encrypted to the recipient.

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