# vector secret

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### Use of vector ry in game programming 1

. AThe unit vector of isA/|A|, That is, (x, y)/SQRT (x ^ 2 + y ^ 2 ). Iv. simple 2-D tracking Now, with the basic vector knowledge, we can analyze a common problem-tracking from one point on the screen to another. In fact, this problem can also be understood as a line-drawing problem, there are many online draw algorithms: DDA, midpoint, and bresenham. However, these algorithms are generally used to draw f

### Mesh profile (3.8) mesh security

process before the serial number reaches its maximum value. This also guarantees that the serial number will never be duplicated (wrap around surround)IV IndexThe initialization vector index is a 32bit value. And he is a shared resource in the network. ( all nodes in the network share the same IV index , and the IV index is used in the subnets they own.) ）The IV index starts with 0x000000. Increased through the IV update process.IV the time to increa

### "C + + programming principles and Practice" reading notes (v)

CopyOur vector type has the following form:Class vector{Private:int sz; Double * Elem;public:vector (int s): SZ (s), Elem (new Double[s]) {} ~vector () {delete [] elem;};Let's try to copy one of these vectors:void f (int n) {vector V (3);V.set (2, 2.2);Vector v2 = v; //...}

### Photoshop Advanced Layer Tips Step by step

Advanced | Skill layer is one of the most important parts of Photoshop. In many people's eyes, a layer may not be as mysterious as a channel-after all, it is easier to create a new layer and paint it on it than to bother to operate the channel. From the Photoshop3.0 began to appear in the layer, development so far, has a powerful function. If your understanding of layers is limited to painting images separately and simply blending patterns, then it's a bit overqualified. You know, a lot of hidde

### Eigenvalues and eigenvectors of matrices of linear algebra

points (a bit of a mouthful! ). ), someone called it "left 0 space" (leftnull). This: number of columns in a = Dim ( left 0 space of a) + Dim ( column Space of a) the left 0 space of a is also orthogonal to the column space of a, and they add up to just one w space. Their bases also form the base of W. Relationship between row space and column space of transformation matricesDon't forget that the transformation matrix actually transforms the target vect

### Secure instance sharing for PHP

string "Abcdefghijklmnopqrstuvwxyzabcdefghij ..." and pass it in. We can then calculate how long it will take to return. Then we know which role is different! This is the basis for timed attacks. But we don't have code that looks like that in the real world. Let's look at a real example: \$secret = "Thisismykey", if (\$_get[' secret '!== \$secret) {die ("not all

### Nodejs Advanced: The Security basics you need to master in the crypto module

split blocks according to a specific pattern.Common packet encryption modes are: ECB (unsecured), CBC (most commonly used), CFB, OFB, CTR, etc.In the simplest case of the ECB, split the messages into equal modules and encrypt them with a secret key.Photo Source: Here, more about the packet encryption mode can refer to the wiki. The following assumes that each block has a length of 128 bits 2. Initialization

### Photoshop Advanced Layer Tips (first)

Advanced | Skill layer is one of the most important parts of Photoshop. In many people's eyes, a layer may not be as mysterious as a channel-after all, it is easier to create a new layer and paint it on it than to bother to operate the channel. From the Photoshop3.0 began to appear in the layer, development so far, has a powerful function. If your understanding of layers is limited to painting images separately and simply blending patterns, then it's a bit overqualified. You know, a lot of hidde

### Computer network 4. Network Layer and IP protocol

is equal to the time between receiving them at the destination or the time interval does not exceed a fixed value.Security Service: the source host's network layer can encrypt all the datagram loads sent to the target host using secret session keys only known to the source and target hosts. The network layer of the target host is responsible for decrypting the load.The network layer of the Internet provides a single network service, which is called t

### Nodejs's crypto encryption

'));functionAesdecrypt (encrypted, key) {Const Decipher= Crypto.createdecipher (' aes192 ', key); vardecrypted = Decipher.update (encrypted, ' hex ', ' UTF8 '); Decrypted+ = decipher.final (' UTF8 '); returndecrypted;}vardata = ' Hello, this is a secret message! ';varKey = ' password! ';varencrypted = ' 8a944d97bdabc157a5b7a40cb180e713f901d2eb454220d6aaa1984831e17231f87799ef334e3825123658c80e0e5d0c ';vardecrypted =Aesdecrypt (encrypted, key); Console

### Matrix-feature vector)

converts the target vector from the row space to the column space. The row space, column space, zero space, and left zero space of the matrix constitute all spaces in our online algebra research. It is very important to clarify the relationship between them for the transformation of the base. Feature equation secret We try to construct such a transformation matrix A: It transforms the

### Encrypt and decrypt using PHP MCrypt

initial vector based on the initial vector size.MCrypt encryption decryption requires the following stepsEncryption:1 Use Mcrypt_module_open () to open the corresponding module for the specified algorithm and Mode.2 mcrypt_get_iv_size () Gets the module initial vector length, mcrypt_enc_get_iv_size (\$td)3 Create initial vect

### Ssl/tls/wtls principle (the figurative analogy of key negotiation: Use the server's public key to negotiate the encryption format, and then encrypt the specific message) good

vector and the HMAC key.) This secret message-the protocol, known as per_master_secret-, is encrypted with the public key of B, encapsulated in a message called Clientkeyexchange. Due to the use of B's public key to ensure that third parties cannot eavesdrop)I generated a secret message and encrypted it with your public key and gave it to you (send Clientkeyexch

### Learn about security in. NET Framework (continued)

parameter is to use the createencryptor method of the tripledescryptoserviceprovider class to generate a encryptor object to complete the actual encryption process. If you need decryption, you can use the createdecryptor method. They all return icryptotransform interfaces. In the example, we can see that the createencryptor method uses two parameters. The first parameter corresponds to the key. This is easy to understand. The symmetric encryption algorithm, of course, requires a key. The second

### The principle of "go" Secure Transport Protocol SSL and TLS and WTLS

, if one of the errors, issue a warning and disconnect, this step ensures the authenticity of B's public key)(generates a secret message that is treated as an encryption key, encrypting the initialization vector and the HMAC key.) This secret message-the protocol, known as per_master_secret-, is encrypted with the public key of B, encapsulated in a message called

### 3D Mathematical Basis---vector in the unity3d of "Unity3d game development"

Vectors are the standard tool for 2D and 3D Mathematical research, and in 3D games vectors are the basis. Therefore, it is very important to master some basic concepts and properties of vectors and common operation methods. In this blog, horse and everyone to review and learn about the Unity3d in the common 3D mathematics knowledge.I. Vector concepts and basic definitions 1, mathematical definitions of vectors A

### Two or three things you may not know about linear models (three, the magic of eigenvalues and singular values)

penalty can well prevent the model from overfitting. in the norm of machine learning (a) L0, L1, and L2 norm, the author intuitively explains why L1 is more advantageous in maintaining simplicity, while L2 in preventing overfitting.Furthermore, the process of solving the linear model with penalty is essentially the maximum likelihood estimation of the solution containing the priori information. A linear model with L1 penalty, assuming that the weight vector

### The physical meaning of matrix and its transformation, eigenvalues and eigenvectors

up just can be a w space, their base also formed the base of W.Relationship between row space and column space of transformation matricesThe transformation matrix actually transforms the target vector from the row space to the column space.The line space, column space, 0 space, and left 0 space of the matrix make up all the space in the study of linear algebra, and make clear the relationship between them, which is very important for the separate bas

### Talk about clustering (4): spectral clustering &lt;reprint&gt;

function. The secret of spectral clustering is full of streets. You can find a copy from the stalls and open it to see the full picture of the spectral clustering algorithm: Construct a Graph Based on the Data. Each node of the graph corresponds to a data point and connects similar points. The Edge Weight is used to represent the similarity between data. This graph is represented in the form of an adjacent matrix and recorded. One of the lazy ways

### Leetcode 299: Bulls and Cows

shoshould return "1A1B". You may assume that the secret number and your friend's guess only contain digits, and their lengths are always equal. Credits:Special thanks to @ jeantimexico for adding this problem and creating all test cases. Subscribeto see which companies asked this question // You and your friends are playing the following guess number game (BullsandCows): you write the next 4-digit mysterious number and ask your friends to guess it. /

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