Currently I am learning about Hybrid Encryption but I was not able to find any good study material.

Below is my understanding:

One of the reason why we use Hybrid Encryption because public-key cryptosystems often rely on complicated mathematical computations and are thus generally much more inefficient than comparable symmetric-key cryptosystems. A hybrid cryptosystem is one which combines the convenience of a public-key cryptosystem with the efficiency of a symmetric-key cryptosystem.

Steps of Hybrid Encryption:

To encrypt a message addressed to Alice in a hybrid cryptosystem, Bob does the following:

• Obtains Alice's public key.
• Generates a fresh symmetric key for the data encapsulation scheme.
• Encrypts the message under the data encapsulation scheme, using the symmetric key just generated.
• Encrypt the symmetric key under the key encapsulation scheme, using Alice's public key.
• Send both of these encryptions to Alice.

To decrypt this hybrid ciphertext, Alice does the following:

• uses her private key to decrypt the symmetric key contained in the key encapsulation segment.
• uses this symmetric key to decrypt the message contained in the data encapsulation segment.

I am pretty much understood how Hybrid Encryption works but I don't see how this is better than Public Key Cryptography.

Question :- Why is Hybrid Encryption superior?

1. It is doing an extra work for generating a symmetric key by using Alice's public key. This will also involve complex mathematical computation.
2. Along with sending data here it also needs to key along.
3. Alice also needs to first decrypt the symmetric key and then decrypt the message. It almost seems like a double work.

I found some answers here but still it seems incomplete link1 and link2

Currently I am learning about Hybrid Encryption but I was not able to find any good study material.

Below is my understanding:

One of the reason why we use Hybrid Encryption because public-key cryptosystems often rely on complicated mathematical computations and are thus generally much more inefficient than comparable symmetric-key cryptosystems. A hybrid cryptosystem is one which combines the convenience of a public-key cryptosystem with the efficiency of a symmetric-key cryptosystem.

Steps of Hybrid Encryption:

To encrypt a message addressed to Alice in a hybrid cryptosystem, Bob does the following:

• Obtains Alice's public key.
• Generates a fresh symmetric key for the data encapsulation scheme.
• Encrypts the message under the data encapsulation scheme, using the symmetric key just generated.
• Encrypt the symmetric key under the key encapsulation scheme, using Alice's public key.
• Send both of these encryptions to Alice.

To decrypt this hybrid ciphertext, Alice does the following:

• uses her private key to decrypt the symmetric key contained in the key encapsulation segment.
• uses this symmetric key to decrypt the message contained in the data encapsulation segment.

I am pretty much understood how Hybrid Encryption works but I don't see how this is better than Public Key Cryptography.

Question :- Why is Hybrid Encryption superior?

1. It is doing an extra work for generating a symmetric key by using Alice's public key. This will also involve complex mathematical computation.
2. Along with sending data here it also needs to key along.
3. Alice also needs to first decrypt the symmetric key and then decrypt the message. It almost seems like a double work.

I found some answers here but still it seems incomplete link1 and link2

Currently I am learning about Hybrid Encryption but I was not able to find any good study material.

Below is my understanding:

One of the reason why we use Hybrid Encryption because public-key cryptosystems often rely on complicated mathematical computations and are thus generally much more inefficient than comparable symmetric-key cryptosystems. A hybrid cryptosystem is one which combines the convenience of a public-key cryptosystem with the efficiency of a symmetric-key cryptosystem.

Steps of Hybrid Encryption:

To encrypt a message addressed to Alice in a hybrid cryptosystem, Bob does the following:

• Obtains Alice's public key.
• Generates a fresh symmetric key for the data encapsulation scheme.
• Encrypts the message under the data encapsulation scheme, using the symmetric key just generated.
• Encrypt the symmetric key under the key encapsulation scheme, using Alice's public key.
• Send both of these encryptions to Alice.

To decrypt this hybrid ciphertext, Alice does the following:

• uses her private key to decrypt the symmetric key contained in the key encapsulation segment.
• uses this symmetric key to decrypt the message contained in the data encapsulation segment.

I am pretty much understood how Hybrid Encryption works but I don't see how this is better than Public Key Cryptography.

Question :- Why Hybrid Encrption is superior?

1. It is doing an extra work for generating a symmetric key by using Alice's public key. This will also involve complex mathematical computation.
2. Along with sending data here it also needs to key along.
3. Alice also needs to first decrypt the symmetric key and then decrypt the message. It almost seems like a double work.

I found some answers here but still it seems incomplete link1 and link2

Could anyone answer?

Currently I am learning about Hybrid Encryption but I was not able to find any good study material.

Below is my understanding:

One of the reason why we use Hybrid Encryption because public-key cryptosystems often rely on complicated mathematical computations and are thus generally much more inefficient than comparable symmetric-key cryptosystems. A hybrid cryptosystem is one which combines the convenience of a public-key cryptosystem with the efficiency of a symmetric-key cryptosystem.

Steps of Hybrid Encryption:

To encrypt a message addressed to Alice in a hybrid cryptosystem, Bob does the following:

• Obtains Alice's public key.
• Generates a fresh symmetric key for the data encapsulation scheme.
• Encrypts the message under the data encapsulation scheme, using the symmetric key just generated.
• Encrypt the symmetric key under the key encapsulation scheme, using Alice's public key.
• Send both of these encryptions to Alice.

To decrypt this hybrid ciphertext, Alice does the following:

• uses her private key to decrypt the symmetric key contained in the key encapsulation segment.
• uses this symmetric key to decrypt the message contained in the data encapsulation segment.

I am pretty much understood how Hybrid Encryption works but I don't see how this is better than Public Key Cryptography.

Question :- Why is Hybrid Encryption superior?

1. It is doing an extra work for generating a symmetric key by using Alice's public key. This will also involve complex mathematical computation.
2. Along with sending data here it also needs to key along.
3. Alice also needs to first decrypt the symmetric key and then decrypt the message. It almost seems like a double work.

I found some answers here but still it seems incomplete link1 and link2