Advantages and Disadvantages of Symmetric and Asymmetric Key Encryption Methods

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Advantages and Disadvantages of Symmetric and Asymmetric Key Encryption Methods - Yahoo Voices - voices.yahoo.com

- Origin and authenticity of message cannot be guaranteed: Since both sender and receiver use the same key, messages cannot be verified to have come from a particular user. This may be a problem if there is a dispute.  Asym metric/ Public Key En cryption  Also known as public key enc ry ption, this method of encr ypting messages makes use of two key s: a public key and a private key.T he public key is made publicly av ailable and is used to encrypt messages by anyone who wishes to send a message to the person that the key belongs to. The private key is kept secret and is used to decrypt receiv ed messages. An example of asymmetric key  encryption system is RSA.  Advant ages - Convenience: It solv es the problem of distributing the key for encry ption.Every one publishes their public key s and private keys are kept secret. - Provides for message authentication: Public key encryption allows the use of digital signatures which enables the recipient of a message to verify that the message is truly from a particular sender. - Detection of tampering: The use of digital signatures in public key encryption allows the receiver to detect if the message was altered in transit. A digitally signed message cannot be modified  without invalidating the signature. - Provide for non-repudiation: Digitally signing a message is akin to physically signing a document. It is an acknowledgement of the message and thus, the sender cannot deny it. See More: How to Encrypt Yo ur Mail Properly  Disadvantages - Public key s should/must be authenticated: No one can be absolutely sure that a public key   belongs to the person it specifies and so every one must verify that their public keys belong to them. - Slow: Public key encryption is slow compared to symmetric encry ption. Not feasible for use in decrypting bulk messages. - Uses up more computer resources: It requires a lot more computer supplies compared to single-key encryption. - Widespread security comprom ise is possible: If an attacker determines a person's private key, his or her entire messages can be read. - Loss of private key may be irreparable: T he loss of a private key means that all received messages cannot be decrypted.

 As for which of them is more secure, there are diff ering views. Some experts c onsider symmetric k ey  encryption to be more secure and others think the public key encryption method is better. Ideally,  both of them are employed together to tak e advantage of their benefits. See More: How to Encrypt Yo ur Mail Properly 

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