Public Key and Private Keys


The Public and Private key pair comprise of two uniquely related cryptographic keys (basically long random numbers). Below is an example of a Public Key:

3048 0241 00C9 18FA CF8D EB2D EFD5 FD37 89B9 E069 EA97 FC20 5E35 F577 EE31 C4FB C6E4 4811 7D86 BC8F BAFA 362F 922B F01B 2F40 C744 2654 C0DD 2881 D673 CA2B 4003 C266 E2CD CB02 0301 0001

The Public Key is what its name suggests - Public. It is made available to everyone via a publicly accessible repository or directory. On the other hand, the Private Key must remain confidential to its respective owner.

Comodo - SSL Certificate Authority

Because the key pair is mathematically related, whatever is encrypted with a Public Key may only be decrypted by its corresponding Private Key and vice versa.

For example, if Bob wants to send sensitive data to Alice, and wants to be sure that only Alice may be able to read it, he will encrypt the data with Alice's Public Key. Only Alice has access to her corresponding Private Key and as a result is the only person with the capability of decrypting the encrypted data back into its original form.

Comodo - SSL Certificate Authority

As only Alice has access to her Private Key, it is possible that only Alice can decrypt the encrypted data. Even if someone else gains access to the encrypted data, it will remain confidential as they should not have access to Alice's Private Key.

Public Key Cryptography can therefore achieve Confidentiality. However another important aspect of Public Key Cryptography is its ability to create a Digital Signature.

< Previous   |   Next >

  • Speak with an expert now

    USA :

    1-888-256-2608

    International :

    1-703-637-9361
Contact an Expert

Contact us for consultation on your security needs.

Contact an expert

White Paper

Free Whitepaper

Driving Company Security is Challenging.

Read more

Featured Client

Verify and secure your site with COMODO. Get your SSL Certificate FAST, Order instantly and easily!. Our SSL is fully trusted by all known browsers.

Comodo Antivirus protection makes your PC impervious to viruses. More than 40 million computers protected by Comodo Internet Security software. Try Now!

Free SSL Certificate