| 摘要 |
After the enciphering of a clear text, arbitrary control characters will occur which are not printable, such as, for example, "return movement of carriage" and "new line". The method of rendering the whole enciphered text printable obviates this disadvantage in accordance with the invention by subjecting all the enciphered characters to an additional processing step. This processing step consists in that the characters of an enciphered text consisting of, for example, 5-bit characters, are subdivided into 4-bit words. The 4-bit words are then extended to a new 5-bit word in a manner such that it is ensured that printable characters are obtained. |
