asymmetric vs symmetric cryptography

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What is the difference between symmetric and asymmetric encryption?

Most efficient for the transfer of small data. Symmetric encryption can take 128 or 256-bit key sizes. Asymmetric takes more key sizes of RSA 2048-bit or more. Symmetric encryption is considered less secure because it uses a single key for encryption. Asymmetric encryption remains safer because it uses two keys in encryption and decryption.

How does symmetric cryptography work?

Symmetric cryptography relies on algorithms that use a single key to encrypt and decrypt information. In other words, the sender uses a secret key to encrypt the message. Then, the recipients use the same key to decrypt and read the data. So, the key needs to be shared across all parties that are authorized to decrypt the message.

What does asymmetric cryptography workflow look like?

Let’s see how asymmetric cryptography workflow looks like: We can see that asymmetric cryptography eliminates two main weaknesses of the symmetric one. First of all, the private key that decrypts the data isn’t transferred anywhere. Therefore, only the recipient poses the private key and is the only person responsible for its security.

What is a symmetric key used for?

Specifically, the key is used to encrypt plaintext - the data’s pre-encryption or post-decryption state - and decrypt ciphertext - the data’s post-encryption or pre-decryption state. Symmetric encryption is one of the most widely used encryption techniques and also one of the oldest, dating back to the days of the Roman Empire.

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