A nonce may be used to ensure security for a stream cipher.

Some machines have more problems with weak keys than others, as modern block and stream ciphers do.

E0 is a stream cipher used in the Bluetooth protocol.

A stream cipher makes use of a much smaller and more convenient key such as 128 bits.

It is quite possible for a stream cipher to be completely insecure.

Short periods for stream ciphers have been a practical concern.

RC4 is the world's most widely used stream cipher.

But the stream ciphers, like RC4, can be very good.

The primitive can be used both as a hash function and a stream cipher.

It is essential that the same key never be used twice with a stream cipher.