A natural language dependent stream cipher is provided to increase complexity of stream cipher encryption. In one aspect, a message is received from a sender as an input in a first natural language and is translated into a selected second natural language. A binary Unicode representation of the input in the second natural language is created. An XOR operation is performed on the binary Unicode representation of the input in the second natural language and a binary key to generate an encrypted output. The encrypted output is sent to a receiver. The encrypted output may be decrypted by the receiver in the reverse of the encryption process. The decryption process yields the original message for viewing by an end-user of the system for a natural language dependent stream cipher.