PDF | The Secure Socket Layer (SSL) and Transport Layer Security (TLS) is the most widely deployed security protocol used today. It is essentially a protocol. Protocols allow client/server applications to communicate in a way designed to prevent eavesdropping, tampering, and message forgery. Secure Sockets Layer . Introduction to SSL. ▫. The overall goal of the Secure Sockets Layer (SSL) protocol is to provide privacy and reliability between two communicating applications.

Secure Socket Layer Pdf

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SSL is the ubiquitous security protocol used in almost % of secure Internet . The original Secure Sockets Layer (SSL) implementation was developed in the. The Secure Sockets Layer (SSL). Due to the fact that nearly all businesses have websites (as well as government agen- cies and individuals) a large. Introduction. Originally developed by Netscape. Communications to allow secure access of a browser to a Web server, Secure Sockets. Layer (SSL) has become.

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Show More. This prepared data is attached with the following header fields: Content type: identifies what payload is delivered by the packet to determine which higher protocols are to be used for processing of data included in the packet.

Major version : establishes the main portion of the protocol version to be used.

SSL session and connection

For SSL 3. With the addition of fields, the process of record preparation is completed. Afterwards, the record is sent to the targeted point. The entire process of preparation of the packet to be sent is illustrated in Figure 3. Figure 3. The Alert Protocol The Alert Protocol is used by parties to convey session messages associated with data exchange and functioning of the protocol.

Each message in the alert protocol consists of two bytes. The first byte always takes a value, "warning" 1 or "fatal" 2 , that determines the severity of the message sent. The next byte of the message contains one of the defined error codes, which may occur during an SSL communication session.

It consists of a single message that carries the value of 1.

The sole purpose of this message is to cause the pending session state to be established as a fixed state, which results, for example, in defining the used set of protocols. This type of message must be sent by the client to the server and vice versa. After exchange of messages, the session state is considered agreed.

The handshake protocol The handshake protocol constitutes the most complex part of the SSL protocol. It is used to initiate a session between the server and the client. Within the message of this protocol, various components such as algorithms and keys used for data encryption are negotiated.

The process of negotiations between the client and the server is illustrated in Figure 4. It can be divided into 4 phases separated with horizontal broken lines. During the first phase, a logical connection must be initiated between the client and the server followed by the negotiation on the connection parameters.

This data is used to protect the key exchange session between the parties of the connection. Session ID: a number that defines the session identifier.

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A zero value in this field indicates that the client wishes to establish a new connection. CipherSuite: a list of encryption algorithms and key exchange method supported by the client. The first element of this field is a chosen method of exchange of cryptographic keys between the client and the server.

The set of encryption algorithms and key exchange method sent in the CipherSuite field establishes three components: the method of key exchange between the server and client, the encryption algorithm for data encryption purposes, a function used for obtaining the MAC value. The server begins the next phase of negotiations by sending its certificate to the client for authentication.

The message sent to the client contains one or a chain of X certificates.

These are necessary for authentication of both the server and the certification path towards a trusted certification official of the certificating body for the server. Moreover, the server can request a certificate from the client.

What is SSL?

After sending this message, the server waits for a client response. If the CA, which has issued the server's certificate is not included in the CAs list, the client attempts to verify the CA signature.

If no information about the CA can be obtained, the client terminates the identification procedure by either returning the error signal or signalling the problem for the user to solve it. Identifying the authenticity of the public key of the CA which has issued the certificate: if the Certifying Authority is included in the client's list of trusted CAs, the client checks the CA's public key stated in the server's certificate with the public key available from the list.

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This procedure verifies the authenticity of the certifying body. Upon successful completion of all steps the server is considered authenticated. If all parameters are matched and the server's certificate correctly verified, the client sends the server one or multiple messages.

The content of this message depends on the negotiated method of key exchange. Moreover, at the server's request, the client's certificate is sent along with the message enabling verification of the certificate. This procedure ends Phase 3 of negotiations. Phase 4 is to confirm the messages so far received and to verify whether the pending data is correct.

Then the client sends the finished message, which is first protected with just negotiated algorithms, keys and secrets. This is to confirm that the negotiated parameters and data are correct.Need Assistance? No Downloads. By making the protocol accessible to its competitors, Netscape was able to gain web server market share with its secure web server product, while, at the same time, ensuring that the SSL protocol would become an IETF proposed standard.

This is the key to the success of SSL — it is an incredibly simple experience for end users.

SSL Information Center

They are ideal for use on websites like this site that provides content, and not used for sensitive data. Upcoming SlideShare.

We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. This type of message must be sent by the client to the server and vice versa.

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