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A block cipher is so-called because the scheme encrypts one block of data at a time using the same key on each block.In general, the same plaintext block will always encrypt to the same ciphertext when using the same key in a block cipher whereas the same plaintext will encrypt to different ciphertext in a stream cipher. One problem is error propagation; a garbled bit in transmission will result in n garbled bits at the receiving side. It is termed "self-synchronizing" because the decryption process can stay synchronized with the encryption process merely by knowing how far into the n-bit keystream it is.One key is used to encrypt the plaintext and the other key is used to decrypt the ciphertext.
Their paper described a two-key crypto system in which two parties could engage in a secure communication over a non-secure communications channel without having to share a secret key.
Synchronous stream ciphers generate the keystream in a fashion independent of the message stream but by using the same keystream generation function at sender and receiver.
While stream ciphers do not propagate transmission errors, they are, by their nature, periodic so that the keystream will eventually repeat.
The Advanced Encryption Standard (AES) and Rijndael 5.10. Because a single key is used for both functions, secret key cryptography is also called symmetric encryption.
The receiver applies the same key to decrypt the message and recover the plaintext.