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Openssl encrypto1/9/2023 MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuA7v5TOXfP48pg2ibneq 1 root root 451 Mar 8 13:34 public_key.pem This command ended up creating the public key: Notice that the public key is generated using the private key as it’s input. $ openssl rsa -pubout -in private_key.pem -out public_key.pem We then generate this private key’s public key by running the following: UwfxXc6VetTPaLWc9ZRrXzE+AyaDV4GosD9TZFzM5HB9gIqz9g+K28XUGtR85mA7 JTfA1SsIlncg4KJXH+QVpNSdcbuI+duUg+VcTAL98HxR5Daah/iYpgdZZFUP2res SRzkTUSfENVTAQbAtRVNt75f/tO9xgC3nVh7Kz9hAoGBANykgv1AWGMrXON18xJX LPeqWUnKD7元dLyYo2QT7UQ9uvssNx2HrgQaKYgQt1oOvvHkKgtuFuOxbcxn53cU TVMpngN19GE/zHPGYHlZcmQczbuqyPvZhl5EDhCW5ACNtTOMc0GETNQomxJKj7ET LWayZvqJYu1YYXADRPHy2ugV8VQQi42Xo+GqLsVbgO2nZc圓ItEoNTNPFmAoq6GXĭW6PqYXeEo4Wmlcvj44K1TbWHHY7MvrVy6MIFMq8kBrsPZTVLiPL6RtvAoGBALwB UunASFYNSDMaAMRcdolz3jW5iWa9AlAwqi/szPqJil4LffI59lZbKBFXUjVK1P6hĬjAOV7PVcQKBgCHAdN9VFw20Dc4HipHpf6k9Al/1TQNissKnEhbppbTWVZU8ppeb XZr0hq0AwiPzS0tpPwsnTHMhzC2TfNfEAZXH+X6zGYrxHz9jS5vxN0p1DuerwD2b McTXOpdC+1QriQ/270b+IQ48zlefFQktdEAB2OnuE2v9/759jQ3CMjDddyUXpw3Sġh3pzSSSBDGAeiUVz3kPsg+mYwKBgQDL9nqxn5JZgBJFBkmZReGBGOQl3WCUUm9G YNFygkNLF4tMRrPsyRtie7MSWKWFtU2tPZ5ZaObXgQKBgQDnBG2c97+xldgBNl7zĤ+pdAbo+gDMjXUltX6fSwVHn/e0BegvuZr9tsZm7Z4kLBgleQ6seO8ByPXpRmIU0 YjQ9XJ8IdByhYA6inTX1a1q2J8u8SUEv7My0/ZkMxr24qLOgD2sMBlOiHrIvpj7qĭfNRtVlpqYBzoIT5NhPLxlOsbgXE90jclkoBn3GZjXBJVrgnLTGZi32InAb84F2WĦNlfspNiytKgQS1jkK12X5d8LcQhYV7p9eMj9eyM9HMoOCLD+YvImW2hRdj9Pwfu LtQNMOu3XLvdxfLfsbAk/8E79FjQl5RVSj0jaDNfxKNERkzeBqQLd+tZInQqnsyV +vuakdCzAgMBAAECggEACrSzt308voR7Op1oaUyElOsTZKqLslo1Dl7BnU2Ga0t2 GpJtuV5NWVdCDtJ3h8pp6MSWy/Q6Aq/gu1rlxWprgttJi/gvDRb2HvJzrEH2c6q2 TbOIHHjh2WEUOT02q4ZPbwNYMk4ZvAzQBmr4gUfvJj6iyaYACdjebjzgsqQyVPcAĬt2Aijue7OMms34wj61bCoGiRTG5h8NsoNRpU5ayqmrV0LFdK+QoA0/Ll63RbCMHĤt+ODgTk元9Qlt2DdZyWTIj1XX8J5R1UlY2O5+851eurhYPAEPAA6kysgRbIYfEj MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQC4Du/lM5d8/jymĭaJud6oi5fbZcro3u7q7wa2JNbTXBtCbamCAdsBdss3jkbSN0shjRdK1X7GWfgsv ![]() 1 root root 1704 Mar 8 13:32 private_key.pem This command ends up creating the following file: In my case I set the complexity to 2048 bits. However a more complex private key also uses up more computing resources encrypting/decrypting data, that’s why a balance needs to be struck. The longer this random number, the more complex the private key is which in turn makes the private key harder to crack using brute force. Openssl initially generates a random number which it then uses to generate the private key. Here we specified the ‘RSA’ Asymmetric Encryption Algorithm which is the industry standard. There are a lot of Asymmetric based Encryption Algorithms avialable. $ openssl genpkey -algorithm RSA -out private_key.pem -pkeyopt rsa_keygen_bits:2048 $ openssl enc -in -out -d -aes256 -k symmetric_keyfile.keyĮncrypting and Decrypting data using Asymmetric encryption $ openssl enc -in secrets.txt -out -e -aes256 -k symmetric_keyfile.key ![]() 1 root root 128 Mar 9 18:46 symmetric_keyfile.key $ openssl rand 128 > symmetric_keyfile.key You can also use a key file to encrypt/decrypt: Now to decrypt, we use the same key (i.e. Here we used the ‘aes-256-cbc’ symmetric encryption algorithm, there are quite a lot of other symmetric encryption algorithms available. Verifying - enter aes-256-cbc encryption password: $ openssl aes-256-cbc -e -in secrets.txt -out ![]() First we create a test file that is going to encrypted A symmetric key can be in the form of a password which you enter when prompted. In the example we’ll walkthrough how to encrypt a file using a symmetric key. Note that it is also possible for the private key to created encrypted files which can then be decrypted by only the key-pair’s public key (or the private key itself).Įncrypting and Decrypting data using symmetric encryption The decrypting is actually done by the key-pair’s private key. The public key can only encrypt files, but can’t decrypt them again (you might wander how it’s possible that a key can decrypt but not encryp, the answer is that there is lot of very complex maths involved). ![]() These keys are commonly referred to as the public key and private key. Asymmetric encryption (aka Public-key cryptography): With this type of cryptograghy, we have a pair of keys (aka key-pair) which are intrinsically linked to each other.This key is used to encrypt data and is also used to decrypt it. Symmetric encryption: With this type of encryption we have a single key.You can find all my latest posts on medium.
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