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Cipher suite
A cipher suite is a set of algorithms that help secure a network connection. Suites typically use Transport Layer Security (TLS) or its deprecated predecessor Secure Socket Layer (SSL) as their protocol. The set of algorithms that cipher suites usually contain include: a key exchange algorithm, a bulk encryption algorithm, and a message authentication code (MAC) algorithm.
The key exchange algorithm is used to exchange a key between two devices. This key is used to encrypt and decrypt the messages being sent between two machines. The bulk encryption algorithm is used to encrypt the data being sent. The MAC algorithm provides data integrity checks to ensure that the data sent does not change in transit. In addition, cipher suites can include signatures and an authentication algorithm to help authenticate the server and or client.
Overall, there are hundreds of different cipher suites that contain different combinations of these algorithms. Some cipher suites offer better security than others. But with the adoption of TLS 1.3, only 5 cipher suites have been officially supported and defined.
The structure and use of the cipher suite concept are defined in the TLS standard document. TLS 1.2 is the most prevalent version of TLS. The newest version of TLS (TLS 1.3) includes additional requirements to cipher suites. Cipher suites defined for TLS 1.2 cannot be used in TLS 1.3, and vice versa, unless otherwise stated in their definition.
A reference list of named cipher suites is provided in the TLS Cipher Suite Registry.
The use of ciphers has been a part of the Secure Socket Layer (SSL) transit protocol since its creation. SSL has been succeeded by TLS for most uses. However, the name Cipher Suite was not used in the original draft of SSL. Instead the ability for a client and a server to choose from a small set of ciphers to secure their connection was called Cipher-Choice. It was not until SSL v3 (the last version of SSL) that the name Cipher Suite was used. Every version of TLS since has used Cipher Suite in its standardization. The concept and purpose of a Cipher Suite has not changed since the term was first coined. It has and still is used as a structure describing the algorithms that a machine supports in order for two machines to decide which algorithms to use to secure their connection. What has changed is the versions of the algorithms that are supported in the cipher suites. Each version of TLS has added support for stronger versions of the algorithms and removed support for versions of the algorithms that have been identified as insecure.
TLS 1.3 marks a change in how cipher suites are coordinated between machines. The cipher suite chosen for two communicating machines to use is determined by the handshake process. Modifications were done in TLS 1.3 to the handshake process to cut down on the number of messages needed to be sent. This allows for less processing, less packet traffic and more efficiency compared to previous versions of TLS.
Each cipher suite has a unique name that is used to identify it and to describe the algorithmic contents of it. Each segment in a cipher suite name stands for a different algorithm or protocol. An example of a cipher suite name: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
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Cipher suite
A cipher suite is a set of algorithms that help secure a network connection. Suites typically use Transport Layer Security (TLS) or its deprecated predecessor Secure Socket Layer (SSL) as their protocol. The set of algorithms that cipher suites usually contain include: a key exchange algorithm, a bulk encryption algorithm, and a message authentication code (MAC) algorithm.
The key exchange algorithm is used to exchange a key between two devices. This key is used to encrypt and decrypt the messages being sent between two machines. The bulk encryption algorithm is used to encrypt the data being sent. The MAC algorithm provides data integrity checks to ensure that the data sent does not change in transit. In addition, cipher suites can include signatures and an authentication algorithm to help authenticate the server and or client.
Overall, there are hundreds of different cipher suites that contain different combinations of these algorithms. Some cipher suites offer better security than others. But with the adoption of TLS 1.3, only 5 cipher suites have been officially supported and defined.
The structure and use of the cipher suite concept are defined in the TLS standard document. TLS 1.2 is the most prevalent version of TLS. The newest version of TLS (TLS 1.3) includes additional requirements to cipher suites. Cipher suites defined for TLS 1.2 cannot be used in TLS 1.3, and vice versa, unless otherwise stated in their definition.
A reference list of named cipher suites is provided in the TLS Cipher Suite Registry.
The use of ciphers has been a part of the Secure Socket Layer (SSL) transit protocol since its creation. SSL has been succeeded by TLS for most uses. However, the name Cipher Suite was not used in the original draft of SSL. Instead the ability for a client and a server to choose from a small set of ciphers to secure their connection was called Cipher-Choice. It was not until SSL v3 (the last version of SSL) that the name Cipher Suite was used. Every version of TLS since has used Cipher Suite in its standardization. The concept and purpose of a Cipher Suite has not changed since the term was first coined. It has and still is used as a structure describing the algorithms that a machine supports in order for two machines to decide which algorithms to use to secure their connection. What has changed is the versions of the algorithms that are supported in the cipher suites. Each version of TLS has added support for stronger versions of the algorithms and removed support for versions of the algorithms that have been identified as insecure.
TLS 1.3 marks a change in how cipher suites are coordinated between machines. The cipher suite chosen for two communicating machines to use is determined by the handshake process. Modifications were done in TLS 1.3 to the handshake process to cut down on the number of messages needed to be sent. This allows for less processing, less packet traffic and more efficiency compared to previous versions of TLS.
Each cipher suite has a unique name that is used to identify it and to describe the algorithmic contents of it. Each segment in a cipher suite name stands for a different algorithm or protocol. An example of a cipher suite name: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256