| 摘要 |
[Problem] To perform, by use of an existing encryption scheme, an encryption that is excellent in encoding rate and suitable for stream encryption and that exhibits a high security against known plain text attacks. [Solution] From a random number sequence matrix consisting of random number sequences having no mutual correlations and having different lengths, a random number sequence is selected by using, as an index, a random number that is independently generated by means of a physical random number or the like. A plain text to be encrypted is then camouflaged on the basis of the selected random number sequence, further coupled to the aforementioned random number and thereafter subjected to application of a conventional type of encryption algorithm. |
