At we often find ourselves explaining to lớn our customers the concepts of how public và private keys work. We thought it would be helpful khổng lồ discuss what these keys are, what they aren’t, and how they work.The blog below provides a general overview on public and private key pairs rather than an architectural overview of For a detailed understanding of’s public-private key architecture, please kiểm tra out our architectural whitepaper.

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How public & private key encryption works

Public và private keys khung the basis for public key cryptography , also known as asymmetric cryptography. In public key cryptography, every public key matches to lớn only one private key. Together, they are used to encrypt & decrypt messages. If you encode a message using a person’s public key, they can only decode it using their matching private key.

Public & private keys: an example

Bob wants to skết thúc Alice an encrypted email. To vì chưng this, Bob takes Alice’s public key và encrypts his message lớn her. Then, when Alice receives the message, she takes the private key that is known only to her in order to lớn decrypt the message from Bob.Although attackers might try to lớn compromise the VPS and read the message, they will be unable to lớn because they lack the private key khổng lồ decrypt the message. Only Alice will be able lớn decrypt the message as she is the only one with the private key. And, when Alice wants khổng lồ reply, she simply repeats the process, encrypting her message to Bob using Bob’s public key.

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More on how public và private keys are used: Whitepaper: Security và DesignArticle: End-to-end encryptionThe difference between public và private keysPublic keys have sầu been described by some as being like a business’ address on the website – it’s public & anyone can look it up and nói qua it widely. In asymmetric encryption, public keys can be shared with everyone in the system. Once the sender has the public key, he uses it khổng lồ encrypt his message.Each public key comes paired with a unique private key. Think of a private key as akin to lớn the key lớn the front door of a business where only you have a copy. This defines one of the main differences between the two types of keys. The private key ensures only you can get through the front door. In the case of encrypted messages, you use this private key to lớn decrypt messages

Together, these keys help to ensure the security of the exchanged data. A message encrypted with the public key cannot be decrypted without using the corresponding private key.

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Generating public and private keys

The public và private key are not really keys but rather are really large prime numbers that are mathematically related to lớn one another. Being related in this case means that whatever is encrypted by the public key can only be decrypted by the related private key.A person cannot guess the private key based on knowing the public key. Because of this, a public key can be freely shared. The private key however belongs to lớn only one person.There are several well-known mathematical algorithms that are used lớn produce the public và private key. Some well-respected algorithms include:

Private keys enable:

You can decrypt a message secured by your public key You can sign your message with your private key so that the recipients know the message could only have sầu come from you.

Public-private key encryption: Real world examples

Digital signatures

Public và private keys can also be used to lớn create a digital signature. A digital signature assures that the person sending the message is who they clayên to be.Typically, we use the recipient’s public key to lớn encrypt the data và the recipient then uses their private key lớn decrypt the data. However, using the scheme of digital signatures, there’s no way khổng lồ authenticate the source of the message. Mike could get a hold of Alice’s public key (since it’s public) and pretkết thúc that Bob is the person sending a message to Alice.To create a digital signature, Bob digitally signs his email to Alice using his private key. When Alice receives the message from Bob, she can verify the digital signature on the message came from Bob by using his public key. As the digital signature uses Bob’s private key, Bob is the only person who could create the’s method for securing messages is a bit more complex than the example provided above sầu. However, the example provides a good general overview for how asymmetric encryption works.


Diffie-Helman key exchange

The Diffie Hellman key exchange demonstrates an example of how users can securely exchange cryptographic keys over a public channel.In the past, secure encrypted communication required that the individuals first exchange keys by a secure means such as paper key lists transported by a trusted courier. The Diffie–Hellman key exchange method allows two parties that have sầu no prior knowledge of each other to lớn jointly establish a shared secret key over an insecure uses the Diffie Hellman key exchange khổng lồ enable Web Web is a browser based end-to-over encrypted email service that allows users lớn easily access their secure tin nhắn tài khoản on the website without any software tải về or any passwords khổng lồ remember.Here’s a đoạn phim khổng lồ explain how this works:

Business benefits of public private key encryption


Public & private key pairs size the basis for very svào encryption & data security. If you are interested in reading more about public and private keys, take a look at the following articles: