What does KEM mean in UNCLASSIFIED
KEM (Key Encapsulated Mechanism) is a cryptographic primitive used in key exchange protocols to securely establish a shared secret between two or more parties over an insecure channel. It involves encapsulating a symmetric encryption key within a public-key cryptosystem, ensuring that only the intended recipient with the corresponding private key can retrieve it.
KEM meaning in Unclassified in Miscellaneous
KEM mostly used in an acronym Unclassified in Category Miscellaneous that means Key Encapsulated Mechanism
Shorthand: KEM,
Full Form: Key Encapsulated Mechanism
For more information of "Key Encapsulated Mechanism", see the section below.
Key Encapsulation Process
The KEM process typically involves the following steps:
- Key Generation: The sender generates a random symmetric key, known as the session key.
- Encapsulation: The sender encrypts the session key using the recipient's public key, resulting in an encapsulated key.
- Transmission: The encapsulated key is transmitted to the recipient over the insecure channel.
- Decapsulation: The recipient uses their private key to decrypt the encapsulated key, recovering the original session key.
Key Exchange Protocol
KEM is often used in conjunction with other cryptographic primitives to establish a secure key exchange protocol. For example, a widely adopted protocol is the Diffie-Hellman Key Exchange (DHKE), which combines KEM with a Diffie-Hellman key agreement.
Essential Questions and Answers on Key Encapsulated Mechanism in "MISCELLANEOUS»UNFILED"
What is Key Encapsulated Mechanism (KEM)?
A KEM is a cryptographic mechanism that encapsulates a symmetric key inside a public-key encrypted structure. This ensures secure distribution of the key to authorized parties.
How does a KEM work?
A KEM generates two sets of keys: a public/private key pair for encryption and a symmetric key for the encapsulated data. The public key is used to encrypt the symmetric key, which is then encapsulated in a ciphertext structure. The ciphertext can only be decrypted by the corresponding private key, allowing the authorized party to access the symmetric key.
What are the advantages of using a KEM?
KEMs offer several advantages:
- Secure key distribution: KEMs enable secure distribution of symmetric keys without exposing them to eavesdroppers.
- Ciphertext encapsulation: The encrypted symmetric key is embedded in the ciphertext structure, ensuring confidentiality.
- Hybrid encryption: KEMs combine the security of public-key encryption with the efficiency of symmetric encryption.
Where are KEMs used?
KEMs are widely used in various cryptographic applications, including:
- Key exchange protocols (e.g., TLS, SSH)
- Secure messaging systems (e.g., WhatsApp, Signal)
- Cloud computing and storage services
What are some examples of KEMs?
Some well-known KEMs include:
- Elliptic Curve Diffie-Hellman (ECDH) KEM
- Koblitz Elliptic Curve Diffie-Hellman (KECDH) KEM
- NTRU KEM
How do KEMs differ from traditional key exchange methods?
Unlike traditional key exchange methods (e.g., Diffie-Hellman), KEMs provide an additional layer of security by encapsulating the symmetric key in a ciphertext structure. This prevents eavesdroppers from obtaining the key even if they intercept the exchanged messages.
Final Words: KEM is a crucial component in many cryptographic protocols, providing a secure mechanism for key establishment over insecure channels. It enables parties to communicate securely without sharing sensitive information directly, making it an essential tool in ensuring the confidentiality and integrity of online communications.
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