Digital Certificates - Reading Assignment

Blockchain Business Course
#1

Welcome to the discussion about this reading assignment.

Leave your answers to the questions below in this thread. If you have any questions or you want to discuss something connected to the assignment feel free to do it in this thread as well, but please everything to the topic.

  1. What is a digital certificate?
  2. What is the difference between a digital certificate and a public key?
  3. What is the most common use case for digital certificates?
  4. What is a certificate authority?
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#2

Digital Certificates – Reading Assignment

1. What is a digital certificate?

A digital certificate, also known as a public key certificate, is used to cryptographically link ownership of a public key with the entity that owns it. Digital certificates are for sharing public keys to be used for encryption and authentication.

2. What is the difference between a digital certificate and a public key?

Public key cryptography depends on key pairs: one a private key to be held by the owner and used for signing and decrypting, and one a public key that can be used for encryption of data sent to the public key owner or authentication of the certificate holder’s signed data. The digital certificate enables entities to share their public key in a way that can be authenticated. (techtarget.com)

3. What is the most common use case for digital certificates?

To provide assurance that published content has not been modified by any unauthorized actors, and to share keys for encrypting and decrypting web content.

4. What is certificate authority?

The vast majority of digital certificates are issued by a certificate authority (CA). CAs are considered trusted third parties.

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#3
  1. A digital certificate is used to cryptographically link ownership of a public key with the entity that owns it.
  2. Digital certificates include the public key being certified, identifying information about the entity that owns the public key, metadata relating to the digital certificate and a digital signature.
  3. They are most commonly used for initializing secure SSL connections between web browsers and web servers. Digital certificates are also used for sharing keys to be used for public key encryption and authentication of digital signatures.
  4. Most digital certificates are issued by a certificate authority. CAs are considered trusted third parties.
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#4
  1. What is a digital certificate?

A digital certificate, also known as a public key certificate, is used to cryptographically link ownership of a public key with the entity that owns it. Digital certificates are for sharing public keys to be used for encryption and authentication.

  1. What is the difference between a digital certificate and a public key?

In public key cryptography; digital signatures are generated using algorithms for signing of data, with the result that a recipient can irrefutably confirm that the data was signed by the holder of a particular public key. Whereas digital certificates themselves are signed digitally, they should not be trusted unless the signature can be verified.

  1. What is the most common use case for digital certificates?

Digital certificates are most commonly used by web browsers and web servers to provide assurance that published content has not been modified by any unauthorized actors, and to share keys for encrypting and decrypting web content.

  1. What is a certificate authority?

A third party issuer of digital certificates.

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#5
  1. a digital certificate is an electronic document , used to prove ownership of a public key
    2.digital certificates has more information then just a public key. a digital certificate, usually contains info, like the name of the issuer, or other info about the entity that owns the public key, and has a digital signature that proves the entity owns the public key.
    3.to prove that information transmitted to the receiver, has not been modified before getting to the receiver.
    4,it is an authority that issues a digital certificate. it is usually a trusted 3 rd party
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#6

  1. What is a digital certificate?
    A digital certificate is used to cryptographically link ownership of a public key with the entity that owns it.

  2. What is the difference between a digital certificate and a public key?
    A digital certificate differs from a public key in that it is broader. Digital certificates include the public key being certified, identifying information about the entity that owns the public key, metadata relating to the digital certificate and a digital signature of the public key created by the issuer of the certificate.

  3. What is the most common use case for digital certificates?
    Digital certificates are used in public key cryptography functions; they are most commonly used for initializing secure SSL connections between web browsers and web servers. Digital certificates are also used for sharing keys to be used for public key encryption and authentication of digital signatures.

  4. What is a certificate authority?
    Certificate Authority, or CA’s, are considered trusted third parties in the context of a Publick Key Infrastructure; using a trusted third party to issue digital certificates enables individuals to extend their trust in the CA to the trustworthiness of the digital certificates that it issues.

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#7

  1. What is a digital certificate?
    A digital artifact that authenticates the owner of a public key and its private key counterpart. The reason to trust the digital certificate is based on trusting the issuer (a CA).

  2. What is the difference between a digital certificate and a public key?
    The digital certificate contains the public key and is a declaration of who owns the of the public key. The public key is the “cryptographic data” that is used when performing cryptographic functions.

  3. What is the most common use case for digital certificates?
    To retrieve the public key of, and information about an entity and verify this ownership. This implies functionality of a public/private key pair, e.g.

  • privacy (sending messages only readable by the communicating parties) and
  • message integrity (ensuring that messages stay intact, not modified by any third party).
  1. What is a certificate authority?
    An entity that issues certificates and provides trust, i.e. if you’re trusting the CA, you trust the certificates they store. Technically, a CA is endorsing ownership of a public key and the accompanied identity information etc. by signing the corresponding digital certificate with its own private key. If you trust the that the CA’s owns the public key, you’re trusting the digital certificate. This could be chained, having a “parent CA” signing the public key ownership of the child CA in another digital certificate. The CA at the end of the chain, the anchor of trust, is called the root CA.
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#8

1. What is a digital certificate?
Also known as a public key certificate, is used to link the owner of a public key with the entity that owns the certificate.
2. What is the difference between a digital certificate and a public key?
A digital certificate shares public keys and a public key encrypts data.
3. What is the most common use case for digital certificates?
A digital signature which depends on a public key shared by a digital certificate to be trusted. Another use case is for securing SSL connections between web browsers and web servers.
4. What is a certificate authority?
It is a trusted third party that issues digital certificates in the PKI context.

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#9
  1. Digital certificate is used to link ownership of a public key to an entity that owns it.
  2. Digital certificate enables sharing of public key and that can be authenticated. Public key is used for signing and encrypted messages that can only be read by a private key holder. Both keys belong to the same entity.
  3. To assure that the content has not been changed by an unauthorized actor and to share keys for encryption and decription.
    4.CA stands for Certified Authority and represents a trusted third party.
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#10

What is a digital certificate?
A data file that store user data and crypto keys.

What is the difference between a digital certificate and a public key?
A digital certificate holds data and a private key. The public key contains authenticating info to lock up the private key in the certificate. Only the related public key to the certificate can unlock the certificate through cryptographic algorithms.

What is the most common use case for digital certificates?
For encryptions, authentications and digital signatures like TLS-certificates(SSL) , VPN-certificates(Intranet) and E-identifications(Bankings).

What is a certificate authority?
A trusted third party entities provider of digital certificates. Examples of CAs- Comodo, GlobalSsign, IdenTrust, Verisign

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#11
  1. What is a digital certificate? also a public key certificate, is used to cryptographically link ownership of a public key with the entity that owns it
  2. What is the difference between a digital certificate and a public key? The digital certificate enables entities to share their public key in a way that can be authenticated. Public key cryptography depends on key pairs: one a private key to be held by the owner and used for signing and decrypting, and one a public key that can be used for encryption of data sent to the public key owner
  3. What is the most common use case for digital certificates? To provide assurance that published content has not been modified by any unauthorized actors, and to share keys for encrypting and decrypting content.
  4. What is a certificate authority? CAs are considered trusted third parties, and they are the issuer
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#12
  1. What is a digital certificate?

A digital certificate aka a public key the digital certificate is used to Cryptographically link ownership of a public key with the entity that owns it digital certificates are for sharing public keys to be used for encryption and authentication.

  1. What is the difference between a digital certificate and a public key?

A digital certificate enables entities to share their public key in a way that can be authenticated. The public key is the cryptographic data that is used when preforming cryptographic functions.

  1. What is the most common use case for digital certificates?

The most common use case for certificates are initializing secure SSL connections between web browsers and web services.

  1. What is a certificate authority?

CA’s are Trusted third parties in the context of a PKI (public key infrastructure) that can issue digital certificates.

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#13

  • What is a digital certificate?
    It’s a public key that can use shared, safely, allowing the recipient to verify that sent data is valid.

  • What is the difference between a digital certificate and a public key?
    A digiital certificate is the means by which a public key is shared.

  • What is the most common use case for digital certificates?
    Validating the authenticity of a given message.

  • What is a certificate authority?
    A certificate authority is an established/trusted entity that provides the certificates.

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#14
  1. A digital certificate is a cryptographic ‘proof’ if you will, linking the public key with the entity who owns it.
  2. A public key (like a postal address for example), is a destination address of sorts, and not much else information. A certificate contains much more data, such as
    a) The public key being certified
    b) Identifing information about the entity that owns the private key
    c) metadata relating to the digital certificate
    d) a digital signiture of the public key being created by the issuer of the certificate
  3. Used to link the owner to the key in a way which cab be verified and authenticated, one common use to to establish some secure connections to ensure both parties are who they say they are (SSL connections)
    4.Ironically, a trusted third party
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#15
  1. a digital certificate links the public key with an organisation
  2. the public key is used encryption/decryption of a message, the certificate is used for verifiying the owner of the pubic key
  3. we can proof that a message comes from the owner of the certificate
  4. a trusted third party which issues certificates
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#16

  1. What is a digital certificate?
    A link between a public key and the person that owns it.

  2. What is the difference between a digital certificate and a public key?
    A public key does not imply linked ownership.

  3. What is the most common use case for digital certificates?
    Proving data is authentic from the expected publisher and not altered.

  4. What is a certificate authority?
    A trusted entity for proof stating the validity of the certificate.

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#17

1. What is a digital certificate?
A certificate issued by Certificate Authority that includes certificate owner’s name, owner’s public key and its expiration date, certificate issuer’s name, certificate issuer’s digital signature etc that establishes trust that the information is sent by the real owner of the certificate.

2. What is the difference between a digital certificate and a public key?
Digital Certificate is issued by a third party (usually CA), contains a public key and authenticates the entity of the sender. Public key is sent out by the sender for the receiver to decrypt sender’s digital signature. When a public key is included and authenticated by a digital certificate, it is proven that the data sent is by the legit sender.

3. What is the most common use case for digital certificates?
Used in websites, emails, voice messaging apps etc through SSL or TSL certificate to assure that the published content hasn’t been modified by hackers in transit between servers and clients.

4. What is a certificate authority?
A third party who establishes trust in the context of PKI - public key infrastructure, that issue digital certificate.

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#18

  1. What is a digital certificate?
    Digital Certificates, or Public Key Certificates, are cryptographic links of ownership from a public key to the entity which owns said key.

  2. What is the difference between a digital certificate and a public key?
    The digital certificate describes the relationship between the key and the entity, the public keys are the pairs used for authentication of the relationship and ensuing action

  3. What is the most common use case for digital certificates?
    Digital certificates are used for sharing public keys to be used for encryption and authentication

  4. What is a certificate authority?
    A certificate authority is a trusted third party used to issue public keys

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#19

Or, what @cryptojay said.

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#20
  1. What is a digital certificate?
    A sertificate that prooves servers identity and allows clients to check if the encrypted data you recieve belongs to the original source.
  2. What is the difference between a digital certificate and a public key?
    A digital Certificate is issued by the 3rd party. A public key is on the other hand is generated by the private key holder (server) and used to check if the information recieved belongs to the private key holder.
  3. What is the most common use case for digital certificates?
    SSL certificates for retailers that handle the credit card information of the customers. They need to make sure that they have connected to a secure website.
  4. What is a certificate authority?
    A third party that issues the certificate.
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