Definition - What does
Cryptography involves creating written or generated codes allowing information to be kept secret. Cryptography converts data into a format that is unreadable for an unauthorized user, allowing it to be transmitted without anyone decoding it back into a readable format, thus compromising the data.
Information security uses cryptography on several levels. The information cannot be read without a key to decrypt it. The information maintains its integrity during transit and while being stored. Cryptography also aids in non-repudiation. This means that neither the creator nor the receiver of the information may claim they did not create or receive it. Cryptography also allows senders and receivers to authenticate each other through the use of key pairs. There are various types of algorithms for encryption:
Secret Key Cryptography (SKC): Here only one key is used for both encryption and decryption. This type of encryption is also referred to as symmetric encryption.
Public Key Cryptography (PKC): Here two keys are used. This type of encryption is also called asymmetric encryption. One key is the public key and anyone can have access to it. The other key is the private key, and only the owner can access it. The sender encrypts the information using the receiver’s public key. The receiver decrypts the message using his/her private key. For non-repudiation, the sender encrypts plain text using a private key, while the receiver uses the sender’s public key to decrypt it. Thus, the receiver knows who sent it.
Hash Functions: These are different from SKC and PKC. They have no key at all and are also called one-way encryption. Hash functions are mainly used to ensure that a file has remained unchanged.
Public Key Cryptography (PKC)
Controlled Cryptographic Item (CCI)
Can Public Key Infrastructure Provide More Security Online?
- So just how safe is your data? Here we take a deeper look at the PKI technology being designed to protect it.
12 DNS Records Explained
- DNS can be a little daunting. We'll show you how it works by dissecting the most common DNS records.
An Intro To Bitcoin: Can A Virtual Currency Work?
- The major stumbling block for virtual currencies has been security, but this cryptocurrency thinks it has the answer. Learn all about Bitcoin, including how it is created, valued and used.
Related White Papers
Recommended For You
Why APIs Have Become a Big Deal
Connect with us
Techopedia on Linkedin
Follow us on LinkedIn
Techopedia on Twitter
Sign up for Techopedia's Free Newsletter!
History of Tech
Who To Follow
Buzzwords and Jargon
World Wide Web