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4.1 Additive Stromverschlüsselung

Animation 4.1-1 represents the principle of an additive stream cipher.

The follwoing symbols are used: $k$ is the secret, symmetric key, $f$ is the keystream generator, $m_t$ the message sequence and $z_t$ the keystream sequence.

Encryption and Decryption are calculated by the following terms.

Encryption: $c_t = z_t + m_t$
Decryption: $m_t = z_t + c_t$

Animation 4.1-1: Additive Stromverschlüsselung