What is the difference between Private key cryptography and public key cryptography?

Answer 1

Public key encryption refers to a type of cypher or code architecture known as public key cryptography that utilizes two keys, or a key pair), to encrypt and decrypt data. One of the two keys is a public key, which anyone can use to encrypt a message for the owner of that key. The encrypted message is sent and the recipient uses his or her private key to decrypt it. This is the basis of public and private key encryption.

Answer 2

It depends on how you apply the term "secret key encryption". In one sense "Secret key encryption" refers to using symmetric keys - both parties have the key and must keep it secret in order to protect the confidentiality of the communication. Usually the process that was used to encrypt the original message can be decrypted by repeating the encryption process with the original secret key. This should provide for confidentiality, non-repudiation, and validation since only the holders of the shared secret key should be able to successfully encrypt and decrypt the messages.

In contrast to the symmetric key encryption, Public Key encryption uses two keys in the encryption/decryption process. Anything encrypted with one key can be decrypted with the other key. The "public key" is published for everyone to access. The "private key" is kept by the owner and not made available to the world. The encryption of the original message using one key can be "undone" only by using the other key. Using the public key on a message already encrypted with the public key only results in an even more jumbled and unintelligible mess. The end result is that is someone encrypts a message with their private key, only their public key can be used to decrypt it, thus verifying the source of the message. Any message encrypted using the public key can only be decrypted with the private key, thus providing confidentiality. If two users want to use asymmetric encryption to communicate securely, they can do it this way:

Alice encrypts a message to Bob using Bob's public key. Only Bob can decrypt it and read it (using his private key). He can then send a return email to Alice using Alice's public key that only Alice can decrypt and read (using her own private key). If they wish, they can use this method to agree upon and exchange a shared symmetric key than can be used for further secure communications. Several automatic secure protocols use exactly this method or a variation of it.

The alternate meaning is to make "secret key" synonymous with the "private key" of asymmetric encryption. In this case there is really no difference between secret key and public key encryption except for which key of the public/private key pair is being used and who can read it.

Answer 3

Symmetric key cryptography is also called secret key cryptography. Basic difference between symmetric and public key cryptography is that in symmetric key there only one key while in public key there are two keys one is kept public and other private.

Answer 4

"secret key" is usually used to refer to a shared key used in symmetric encryption while "private key" is used to refer to the key retained by the user from the key pair generated for use in an asymmetric encryption algorithm. It gets confusing sometimes because the "private key" of asymmetric encryption is often referred to as a "secret key" because the owner keeps it secret.

Answer 5

Symmetric encryption is a single shared, private key between communicating nodes. There is only 1 key involved.

Public Key encryption (or asymmetric encryption) requires a pair of keys; a public and a private key for exchanging data in a secure manner.

Answer 6

In public key cryptography there are two parts: 1) secret part 2) public part. In order for p1 to send p2 a message, p1 first need to obtain p2's public key and using this key encrypts the message then p2 using his secret key decrypts the message. And in private key cryptography there is only one key so in order for p1 to send a message to p2, p1 should firstly ask p2 for his key then encrypt the message using that key and then p2 uses the same key to decrypt the message.

Answer 7

Private key cryptography : In this the key is kept secret and you can give your key selectively to people. Public key cryptography : in this there are two parts of key one is kept private and one is public.

Answer 8

difference between public key criptography and privare key criptography

Answer 9

Secret key cryptography is also known symmetric key cryptography. So there is no difference between the two.