艾伦图灵苹果公司 双语畅销书《艾伦图灵传》第7章:运转起来(43)

双语畅销书《艾伦图灵传》第7章:运转起来(43)  

It was in this aspect of the Delilah that his cryptanalytic experience came into play.
The work they had done so far constituted the mechanism for 'adding on' to speech.
The crucial question of what to add was the one on which he had spent much of his time since 1938.
而图灵从1938年就开始思考一个更关键的问题，那就是要叠加什么。
In this he could act as the mathematical Cambridge and Bletchley figure
rather than someone who had joined in
somewhat awkwardly and embarrassingly
with the expanding world of electronic engineering.
Although he could not say
nor even hint
the task amounted to creating something like the Fish key generator.
It had to be deterministic
for otherwise it could not be produced identically at o independent ends.
But it had to be sufficiently devoid of pattern or repetition
to be as secure as something truly 'random'
such as electronic noise.
Any kind of mechanism would
inevitably
have some pattern to it; the job was to make sure that it was one that the enemy cryptanalyst could not possibly detect.
So in doing this for the Delilah
he was finally scoring off the half-hearted efforts of German cryptography.
In fact
he was doing very much better
for the Delilah key would have to be supplied in sequences of hundreds of thousands of numbers.
It was like enciphering not telegraph messages
but War and Peace.