| Chapter # | Sentence # | Quote |
|---|---|---|
| 25 | 124 | From the View more quotes about practical">practical point of view, if a cipher is used briefly and for a given short message, it may be impossible to break. |
| Chapter # | Sentence # | Quote |
|---|---|---|
| 25 | 121 | "It seems unlikely," he said. |
| 25 | 122 | "Are there unbreakable ciphers?" asked Samos. |
| 25 | 123 | "Yes," said Bosk, "both from a practical and theoretical point of view. |
| 25 | 124 | From the practical point of view, if a cipher is used briefly and for a given short message, it may be impossible to break. |
| 25 | 125 | There is just not enough material to work with. |
| 25 | 126 | From the theoretical point of view, the unique-sequence cipher cannot be broken. |
| 25 | 127 | It utilizes key words or numbers, but each message is further altered in a prearranged, random manner. |