Can encryption be done without a key?

Is it possible to decrypt without the key?

No, not with the current hardware if a good encryption method was used and the key (password) was long enough. Unless there is a flaw in the algorithm and that you know it, your only option is to brute force it which might takes hundred of years.

Why do we need key for encryption?

Encryption enhances the security of a message or file by scrambling the content. To encrypt a message, you need the right key, and you need the right key to decrypt it as well.It is the most effective way to hide communication via encoded information where the sender and the recipient hold the key to decipher data.

Is encryption a key?

An encryption key is a random string of bits created explicitly for scrambling and unscrambling data. Encryption keys are designed with algorithms intended to ensure that every key is unpredictable and unique. The longer the key built in this manner, the harder it is to crack the encryption code.

Is encryption done with public key?

Public Key (or asymmetric encryption) In a public key system, two keys are used, one for encrypting and one for decrypting. The two keys are mathematically related to each other but knowing one key does not divulge the other key. The two keys are called the “public key” and the “private key” of the user.