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The asymmetric key algorithms are used to create a mathematically related key pair: a secret private keyand a published public key.
Conventional encryption ciphers rely on a single key for both encryption and decryption. Modern protocols will use a private key for encryption and a different public key for decryption. These two keys are mathematically related in a fashion that allows them to encrypt/decrypt the same data successfully.
in synchronous communication data will be transmitted with clock and in asynchronous only start and stop bit is required for transmission of databut speed of the data transmission in synchronous is very high data rateand in asynchronous speed is slow due to the start and stop bit
Related words are "encryption" and "cryptography".
Data Encryption Standard. The related link will give you more information