SYMMETRIC KEY STREAM CIPHER CRYPTOGRAPHIC METHOD AND DEVICE

The subject of the invention is a symmetric key stream cipher cryptographic method for encrypting plaintexts and decrypting ciphertexts during which process a text to be encrypted or an encrypted text is scanned with an input/output data buffer, a pseudo random number is created with a pseudo random...

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Format Patent
LanguageEnglish
Published 13.06.2018
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Summary:The subject of the invention is a symmetric key stream cipher cryptographic method for encrypting plaintexts and decrypting ciphertexts during which process a text to be encrypted or an encrypted text is scanned with an input/output data buffer, a pseudo random number is created with a pseudo random number generator with a seed, a key automaton is used for encryption and/or decryption. It is characterized in that the procedure involves the method whereby using the characters of the text scanned by the input/output data buffer and the pseudo random number generated by the pseudo random number generator, an element of the key automaton's transition matrix is directly reached from the input/output data buffer; the procedure is then repeated. A symmetric key stream cipher cryptographic device for implementing the method of claim is also the subject of the invention.