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Furthermore, stream ciphers have different implementation

properties that restrict the cryptanalyst. They only receive their inputs once

(a key and a nonce) and then produce a long stream of pseudo-random data. A

stream cipher can start with a strong cryptographic operation to thoroughly

mix the key and nonce into a state, and then use that state and a simpler

mixing operation to produce the key stream...

If the attacker tries to manipu-late

the inputs to the cipher he encounters the strong cryptographic operation.

Alternatively he can analyse the key stream, but this is a static analysis only.

As far as we know, static attacks are much less powerful than dynamic attacks.

As there are fewer cryptographic requirements to fulfill, we believe that the

key stream generation function can be made significantly faster, per message

byte, than a block cipher can be...

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