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    Home»Security»Difference between public key and private key cryptography in Cryptology
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    Difference between public key and private key cryptography in Cryptology

    AdministratorBy Administrator07.03.2022No Comments3 Mins Read
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    What is public and private key cryptography?

    There are two main concepts in cryptography: encryption and decryption. Encryption is the transformation of the original message into unreadable, i.e. encrypted. Decryption is the transformation of an encrypted message back into its original form. The algorithm and key are used for both encryption and decryption, and there are two encryption and decryption methods: symmetric and asymmetric encryption. Symmetric encryption, also called private key encryption, has been known to mankind for a very long time. On the other hand, asymmetric encryption, also called public key encryption, only came into existence in the 1970s and became really widespread as the Internet developed.
    Difference between public key and private key cryptography in Cryptology

    What is Private Key Encryption?

    Private key encryption is a very popular, simple and effective encryption system. This allows both encryption and decryption to be performed using the same key. Since anyone with the key can decrypt the information encrypted in this way, this key must be kept secret and accessible only to the sender and recipient of the information. That is why it is called private key and the encryption system itself is called private key encryption.

    What is Public Key Encryption?

    This encryption system is much more complex, it only uses the private key to decrypt the message. To encrypt the same message, a separate public key derived from the public key is used. If a person knows the private key, he can calculate the public key. However, knowing only the public key is not enough to calculate the private key. This is why the public key does not need to be kept secret, since knowing it does not allow the encrypted information to be decrypted.

    How does public and private key encryption work?

    In private key cryptography, the sender encrypts a message with the private key and sends it to the recipient. In order for the recipient to decrypt the message, they would need the sender to provide the same private key through a well-secured channel, which reduces the security of such cryptographic systems.
    1646606150 632 Difference between public key and private key cryptography in Cryptology
    In public key cryptography, the sender of a message encrypts the message with the public key and sends it to the recipient. The recipient of the message receives it and decrypts it with a private key that only they have. Because only the recipient needs the private key in this encryption system, it does not need to be sent, making it more secure. In public-key cryptography, only the recipient—not even the sender—can decrypt the message.
    1646606150 355 Difference between public key and private key cryptography in Cryptology

    Advantages and disadvantages of public key cryptography

    Let’s look at the advantages and disadvantages of these encryption systems by comparing them.

    Comparison of private and public key cryptography

    Private key cryptography

    Public key cryptography

    Encryption-decryption speed

    Faster

    Slow down

    Required processing power

    Less

    More

    You need to send the private key over a secure channel

    Yes

    Not

    Key length

    shorter

    longer

    Parties who need to know the private key

    Recipients and senders

    Recipients only

    Complexity of key management in a large network

    High

    Short

    Can be used to create an electronic digital signature

    Not

    Yes

    In this comparison, we can see that although private key encryption is much simpler and faster, it is not suitable for blockchain networks.




    #Difference #public #key #private #key #cryptography #Cryptology

    Cryptography Cryptology Difference key private public
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