Preface
As a programmer, if you still don’t know anything in the face of new knowledge and new technology, and you still have a legacy of more than ten years ago, then you must be behind in knowledge and technology. If you fail to enter the management level, then you It will definitely be shot on the beach by the back waves of the Yangtze River.
Many programmers who are advancing with the times and good at learning are still the backbone of the industry. This just means that today's world has traveled all over the world with a single trick, and the era of life-long eating has passed. A person must live and learn before he can walk in the world.
In my spare time at work, I will also turn over the interview questions of Dachang, so that I can always maintain the interview skills, and at the same time, I can understand the needs of Dachang for technology in order to prepare for emergencies, "Born in trouble, died in peace "The ancients don't deceive me.
Let me share with you a systematic growth and advancement route that I have summarized over the years of my own work, and share it for your reference.
Share a wave of introduction interview questions
Tencent—What is symmetric encryption and what is asymmetric encryption? Do public and private keys belong to symmetric encryption?
Interviewer: What is symmetric encryption and what is asymmetric encryption? Do public and private keys belong to symmetric encryption?
Psychological analysis : Cryptography is generally studied in computer science at a university. When interviewers rely on this question, they will not go deep into the underlying content of cryptography, and the difference between symmetric and asymmetric knowledge will be tested. This question is generally not asked in depth, but will ask about https, which currently uses asymmetric encryption. But job seekers must not fall into the trap, saying that they have never heard of symmetry and asymmetry.
**Job applicants:** should start with encryption and decryption
Public key and private key are commonly known as asymmetric encryption methods, which are an improvement from the previous symmetric encryption (using username and password). Let me explain the principle by e-mail.
The purpose of using public and private keys is to achieve secure emails, and the following purposes must be achieved:
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- The content I send to you must be encrypted and cannot be seen by others during the transmission of the email.
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- It must be ensured that it is the mail sent by me and not someone else impersonating me.
To achieve this goal, both people who send the mail must have a public key and a private key. The public key is for everyone to use. You can publish it via email, or let others download it through the website. The public key is actually used for encryption/verification. The private key is your own and must be kept very carefully. It is best to add a password. The private key is used to decrypt/sign. First of all, as far as the ownership of the key is concerned, the private key is only owned by the individual. The function of the public key and the private key is: the content encrypted with the public key can only be decrypted with the private key, and the content encrypted with the private key can only be decrypted with the public key.
For example, I want to send you an encrypted email. First of all, I must have your public key, and you must also have my public key.
First of all, I use your public key to encrypt this email, so as to ensure that this email is not seen by others, and that this email has not been modified during transmission. After you receive the email, you can decrypt it with your private key and you can see the content.
Secondly, I use my private key to encrypt this email. After it is sent to you, you can decrypt it with my public key. Because the private key is only in my hand, this ensures that this email is sent by me.
When A->B data, A will use B's public key to encrypt, so as to ensure that only B can unlock, otherwise the general public can unlock the encrypted message, which means that the confidentiality of the data is eliminated. Verification uses the mechanism of signing and stamping. When A sends information to everyone, he will use his private key as a signature, so that all people who receive the message can use A’s public key to verify the stamp and confirm the message It was sent by A
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- Tencent T4 level Android architecture technical mind map; check for omissions and make up for systematic in-depth learning
- First-line Internet Android interview questions with detailed explanations (primary to advanced topics)
These questions are the questions asked by group friends this year when they interviewed Tencent, Baidu, Xiaomi, LeTV, Meituan, 58, Cheetah, 360, Sina, Sohu and other top Internet companies. And most of them have sorted out the answers, familiar with these knowledge points will greatly increase the chance of passing the first two rounds of technical interviews
Are there any free learning materials for Android architects?
Have 3-5 years of Android development foundation. I hope to break through the bottleneck and become a small partner of the architect. You can follow me and get it for free in my personal introduction section.
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"Android Learning PDF + Architecture Video + Interview Document + Source Notes" to obtain learning materials to improve yourself to challenge the difficulties of BAT interviews
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+Architecture video + Interview document + Source code notes" to get learning materials to improve yourself to challenge the BAT interview difficulties**
Why share for free?
If the threshold is set, many developers and friends will miss this set of advanced architecture materials and miss the possibility of becoming an architect. This has lost our original intention; so that more people can improve their skills and structure, promote and raise their salary through efficient and high-quality learning.