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Symmetric cryptography uses the same secret (private) key to encrypt and decrypt its data whereas asymmetric uses both a public and private key. Symmetric requires that the secret key be known by the party encrypting the data and the party decrypting the data. Asymmetric allows for distribution of your public key to anyone with which they can encrypt the data they want to send securely and then it can only be decoded by the person having the private key. This eliminates the need of having to give someone the secret key (as with symmetric encryption) and risk having it compromised.

The issue with asymmetric is that it is about 1000 times slower than symmetric encryption which makes it impractical when trying to encrypt large amounts of data. Also to get the same security strength as symmetric, asymmetric must use strong a stronger key than symmetric.

If you do a quick search on the differences between symmetric and asymmetric you can find many more explanations. This just a quick overview.

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โˆ™ 2008-11-08 15:04:27
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โˆ™ 2010-05-06 22:29:28

in symmetric key one key uses for both encryption and decryption, but in asymmetric form, two different seprate keys use for decryption and encryption.

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Q: Difference between symmetric and asymmetric key cryptography?
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Secret key cryptography is also known symmetric key cryptography. So there is no difference between the two.


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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.


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What is the difference between symmetric and asymmetric cryptography?

From another user: Symmetric cryptography uses the same secret (private) key to encrypt and decrypt its data whereas asymmetric uses both a public and private key. Symmetric requires that the secret key be known by the party encrypting the data and the party decrypting the data. Asymmetric allows for distribution of your public key to anyone with which they can encrypt the data they want to send securely and then it can only be decoded by the person having the private key. This eliminates the need of having to give someone the secret key (as with symmetric encryption) and risk having it compromised. The issue with asymmetric is that it is about 1000 times slower than symmetric encryption which makes it impractical when trying to encrypt large amounts of data. Also to get the same security strength as symmetric, asymmetric must use strong a stronger key than symmetric.


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There are two general types of modern cryptography; symmetric cryptography and asymetric (also known as public key) cryptography. Symetric crypto is where both sides have the same shared encryption key, and that key is used to both encrypt and also decrypt any encrypted information. Symmetric crypto is more efficient (faster) than asymmetric crypto, but asymetric crypto works without having to share a key.


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I believe you are asking about "symmetric vs asymmetric" cryptography. In a symmetric cryptographic cipher both parties must use the same key for encryption and decryption. This means that the encryption key must be shared between the parties before any decryption of the message can take place. This transfer of the shared key opens the door for potential detection of the key. These are commonly referred to as "shared secret systems" or "private key systems". In an asymmetric cipher, the encryption key and the decryption keys are separate. In an asymmetric system, each person has two keys. One key, the public key, is shared publicly. The second key, the private key, should never be shared with anyone. When you send a message using asymmetric cryptography, you encrypt the message using the recipients public key. The recipient then decrypts the message using his private key. That is why the system is called asymmetric. Because asymmetric ciphers tend to be significantly more computationally intensive, they are usually used in combination with symmetric ciphers to implement effect public key cryptography. The asymmetric cipher is used to encrypt a session key and the encrypted session key is then used to encrypt the actual message. This gives the key-exchange benefits of asymmetric ciphers with the speed of symmetric ciphers. Examples of symmetric ciphers are AES and DES. Examples of asymmetric cipers are RSA and Diffie Hellman.


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