hallojoe

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OSI Layers

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven abstraction layers. Each layer in the OSI model serves a specific purpose and communicates with the adjacent layers. Here's a brief description of each layer from the bottom (Layer 1) to the top (Layer 7):

Physical Layer (L1):

• Function: Deals with the physical connection between devices.
• Activities: Transmission and reception of raw bit streams over a physical medium, such as cables or wireless signals.
• Devices: Hubs, cables, repeaters.

Data Link Layer(L2):

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Certificate formats

Certificate formats are used to store digital certificates, which are cryptographic files that contain information about an entity (such as a website or an individual) and their corresponding public key. These certificates are used in various security protocols like SSL/TLS to establish secure connections and verify the authenticity of the parties involved. Different formats are used to store certificates and their associated private keys, and they vary in terms of their structure and supported encryption algorithms. Let's go through some of the common certificate formats:

These formats serve different purposes based on whether you need to store certificates, private keys, or other related cryptographic data, and whether you prioritize human-readability or compactness. The choice of format often depends on the system or application you are working with.

PEM (Privacy-Enhanced Mail) .pem, .crt, .cer

PEM is a widely used format that can contain both certificates and private key

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input[role=switch], 
input[role=switch] { 

  // public

  // apperance
  --size:                      1.5; 
  --round:                     1;
  --spacing:                   .125em;
  --transition:                .15s ease-in;

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Isometric Ratio

1.4142:1 1:0.5773

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Status

The REST client is a bitch and Azure pipelines is a man-whore without access to viagra.

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interface IBuilder<T> {
  build(): T
}

interface IValueModel {
  name: string
  date: Date
}

class FluentValueModelBuilder implements IBuilder<IValueModel> {

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Bitwise

Bitwise in 1010 seconds.

AND &

Return 1 where both are 1:

   bin   dec

---

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enum CharacterClassifications {
  None                   = 0, 
  Digit                  = 1,  
  Upper                  = 2,
  Lower                  = 4,
  Space                  = 8,
  Control                = 16,
  SymbolOrPunctuation    = Upper | Lower, 
  AlphaOrDigit           = Digit | Upper | Lower | Space
}

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const UnicodeMap = new Map<string, [number, number]>([
  ["Basic Latin", [32, 127]],
  ["Latin-1 Supplement", [160, 255]],
  ["Latin Extended-A", [256, 383]],
  ["Latin Extended-B", [384, 591]],
  ["IPA Extensions", [592, 687]],
  ["Spacing Modifier Letters", [688, 767]],
  ["Combining Diacritical Marks", [768, 879]],
  ["Greek and Coptic", [880, 1023]],
  ["Cyrillic", [1024, 1279]],