While encryption makes data unreadable to anyone without authorization, decryption does the opposite: it restores the information to its original and understandable form. Both processes rely on a specific type of cryptographic key.
Without the correct key, decryption becomes far more difficult and could, in theory, only be achieved through brute-force attacks that try many possible keys. Robust encryption algorithms are designed to generate keys that are practically impossible to break, because the number of possible combinations would require an impractical amount of time and computing power to test.
In symmetric key cryptography, the same key is used to both encrypt and decrypt a piece of information. Until 1976, this was the only widely known type of encryption technique. The main consideration is that both parties must share the same secret key, and that key needs to be kept private.
On the other hand, public key cryptography, also called asymmetric encryption, uses a pair of mathematically related keys: a public key and a private key. Data encrypted with the public key can only be decrypted with the matching private key. This means the public key can be shared openly, while the private key stays secret and performs the decryption.
A digital currency that is secured by cryptography to work as a medium of exchange within a peer-to-peer (P...
The science of using mathematical theories and computation in order to encrypt and decrypt information.