Moderator: Swati Sharma
Swati Sharma ♦ 0
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Posts by Swati Sharma
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... **Needham and Schroeder Authentication Protocol:**
- N-S is a shared-key authentication protocol designed to generate
and propagate a session key, i.e., a shared key for subsequent
symmetrically encrypted communication.
Note that there is no public key infrastructure in place.
- Needham-Schroeder ...
written 3 months ago by
Swati Sharma ♦ 0
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... **2. S/MIME (Secure / Multipurpose Internet Mail Extension)**
- It is enhancement of MIME protocol.
-SI MIME adds some new content types to include security service to the MIME. All these new types include the parameter " application / pkcs7-mime", in which 'pkcs' defines "Public Key cryptography S ...
written 3 months ago by
Swati Sharma ♦ 0
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... **Secure Email :**
1. PGP : - (Pretty Good Privacy)
- It provide email with privacy, integrity &authentication.
- It can be used to create a secure e-mail message or to store a file securely for future retrieval.
PGP provides following services :
a. Message integrity
b. Message compression. ...
written 3 months ago by
Swati Sharma ♦ 0
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... **Protocols of IPSEC :**
- IPSEC defines two protocols
- a. the Authentication Header (AH)
- b. Encapsulation Security Payload (ESP)
to provide authentication and for encryption for the packets at the IP level.
**1.Authentication Header (AH)** (provide source authentication & data integ ...
written 3 months ago by
Swati Sharma ♦ 0
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... **IP SECURITY: ( IPSEC )**
- IPSEC is a protocol to provide security for a packet at a Network layer which is often referred to as the Internet Protocol or IP layer.
- IPSEC helps to create confidential & authenticated packets for the IP layer.
- It can enhance the security of those client / ...
written 3 months ago by
Swati Sharma ♦ 0
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... **TLS: (Transport Layer Security )**
- TLS protocol is the IETF standard version of SSL protocol. Whose goal is to come out with an internet version of
- SSL & TLS are very similar with slight difference. Following are the differences between TLS & SSL
1. **Version :** the current versi ...
written 3 months ago by
Swati Sharma ♦ 0
• updated
3 months ago by
ethan.john2019 • 0
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... **SSL ( Secure socket Layer )**
This protocol is used for secure communication between the web browser & web server.
SSL protocol is located between the application layer & transport layer of the TCP/IP protocol suite i.e the application layer does not forward the data directly to the tran ...
written 3 months ago by
Swati Sharma ♦ 0
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... **Kerberos**
Many real-life systems use an authentication protocol called Kerberos the Needham - Shroeder is the basis of Kerberos.
Version 4 of Kerberos is found in most practical implementation also version 5 is in use.
**Working of Kerberos**
There are four parties involved in Kerberos protoc ...
written 3 months ago by
Swati Sharma ♦ 0
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... **Knapsack Algorithm**
• It is based on public key encryption algorithms and knapsack
• Given a note of items, each with different weights, it is possible to put some of the items in a bag in such a way that it should not be greater than the weight of the knapsack
• If $V_1, V_2, V_3…..V_4$ are ...
written 3 months ago by
Swati Sharma ♦ 0
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... **EI- Gamal Cryptography**
- EI gamal cryptography works in 3 steps/stages
$\hspace{1.5cm}$a. Key generation
$\hspace{1.5cm}$b. EI gamal encryption
$\hspace{1.5cm}$c. EI gamal decryption
**A. EI gamal key generation:**
1. Select a large prime number ‘P’
2. Select encryption key $‘E_1’$
3. S ...
written 3 months ago by
Swati Sharma ♦ 0
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