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Backend Developer/Security Intern @ DeepFence

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jinnyatw34 发表于 2017-10-30 05:23:29 | 显示全部楼层 |阅读模式

2017(10-12月) 码农类 硕士 实习@Deepfence - 网上海投 - 技术电面 |Otherfresh grad应届毕业生

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想想好像是人生中第一次面试intern哈哈 激动地发一下悲惨的面经?  . visit 1point3acres.com for more.

Deepfence 是一家在匹兹堡的start up ,主要做一些infrastructure层面的security 。  大概是start up的关系所以三个创始人一起周日中午面我一个人。 . visit 1point3acres.com for more.
问题也五花八门,很任性想问什么就问什么哈哈。 以下是楼主整理的一些:

1.[backcolor=rgba(102, 128, 153, 0.0470588)][size=1em]Given a function[backcolor=rgba(102, 128, 153, 0.0470588)][size=1em] short_complex_compute(input,key)[backcolor=rgba(102, 128, 153, 0.0470588)][size=1em] [backcolor=rgba(102, 128, 153, 0.0470588)][size=1em]that takes two inputs : a n-bit integer[backcolor=rgba(102, 128, 153, 0.0470588)][size=1em] input[backcolor=rgba(102, 128, 153, 0.0470588)][size=1em] [backcolor=rgba(102, 128, 153, 0.0470588)][size=1em]and an n-bit secret key[backcolor=rgba(102, 128, 153, 0.0470588)][size=1em] key[backcolor=rgba(102, 128, 153, 0.0470588)][size=1em] . visit 1point3acres.com for more.
[size=1em]Conditions:
  • We know the pseudo code of short_complext_compute
  • We know that all the input, output and keys are n-bit intergers. 鐣欏鐢宠璁哄潧-涓浜╀笁鍒嗗湴
[size=1em]Task :
If the output is generated in the following way :

int temp = short_complex_compute(input,k1);
int output = short_complex_compute(temp,k2);
[size=1em]Task 1: Find k1 and k2 given input and output.
Task 2: If we know the invert function
input = short_complex_compute-1(output,k), can you give a better solution to find k1,k2.
Hint : any data structures that can make this more efficient ?
2 optimization
[size=1em]Given a function f that takes two bit vectors as input and output an interger, how can we find input that approximately give the maximum value of f.
int output = f(vec1,vec2)
Is there any machine learning algorithm that I can apply to it?
Terms : . 鍥磋鎴戜滑@1point 3 acres
- Simulated Annealing
- Genetic Algorithm

3.What is your understanding about unsupervised learning?
4. What is your understanding regarding anomaly detection?
5.What are the two types of optimization function for word2vec?
6.How to apply machine learning into security ?
7.What are you looking for in the internship?

面完感觉本科应该好好学 cryptography 0-0 然而已经还给professor了
不过创始人都蛮好的,因为是校友所以在选课和职业规划上还给了一些指导建议。 (同样因为是校友所以对我选的课具体有多少含金量,考核形式如何等等也都非常了解 : ) )
贴出来面经给要面security相关岗位的同学一些参考啦~  
另外 匹兹堡这几天真的冷哭了  Stay Warm!


 楼主| jinnyatw34 发表于 2017-10-30 05:26:56 | 显示全部楼层
第一个题目是这样的:
. 涓浜-涓夊垎-鍦帮紝鐙鍙戝竷
Given a function `short_complex_compute(input,key)` that takes two inputs : a n-bit integer **input** and an n-bit secret key **key**
Conditions:
-   We know the pseudo code of short_complext_compute
-   We know that all the input, output and keys are n-bit intergers-google 1point3acres

Task :
  If the output is generated in the following way :
cpp
int temp = short_complex_compute(input,k1);
int output = short_complex_compute(temp,k2);
.鏈枃鍘熷垱鑷1point3acres璁哄潧
Task 1:  Find k1 and k2 given input and output.
Task 2: If we know the invert function
         input = short_complex_compute-1(output,k), can you give a better solution to find k1,k2.
. visit 1point3acres.com for more.
Hint : any data structures  that can make this more efficient ?

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