![]() With asymmetric cryptography, a public key that can be shared with anyone gets used to encrypt messages while a private key that’s known only by the recipient gets used to decrypt messages.Ĭritically, it should be relatively easy to compute the public key from the private key but nearly impossible to do the reverse and generate the private key from the public key. Specifically, people (or technology) who want to correspond via symmetric encryption must share the key to do so, and if the channel used to share the key gets compromised, so does the entire system for sharing secure messages since anyone with the key can encrypt or decrypt those communications.īy today’s standards, symmetric encryption is a relatively simple cryptographic algorithm, however it was once considered state of the art and used by the German army in World War II.Īsymmetric cryptography also uses mathematical permutations to encrypt a plain text message, but it uses two different permutations, still known as keys, to encrypt and decrypt messages. “SSS” would not encrypt to three of the same characters), which makes it difficult to decode the encrypted message without the key.Įven though it’s difficult to decrypt messages without the key, the fact that this approach uses the same key for both encryption and decryption creates risk. Importantly, the same plain text letter does not always come out the same in the encrypted message (e.g. It also uses the same mathematical permutation, known as a key, to decrypt messages. ![]() Symmetric cryptography uses mathematical permutations to encrypt a plain text message.
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