The FREE Cybersecurity Glossary by Thor Pedersen!

Symmetric cipher: A type of cipher that uses the same key for both encryption and decryption. It is a fundamental type of encryption technique that uses a single key to convert plaintext data into ciphertext, and the same key is used to convert the ciphertext back into the original plaintext. Examples of symmetric ciphers include DES (Data Encryption Standard), AES (Advanced Encryption Standard), and RC4. They are widely used due to their speed and efficiency but require secure key distribution and management.

Symmetric Key: An encryption method using a single secret key for encrypting and decrypting messages. Both sender and receiver must share and safeguard the key. Symmetric key algorithms are fast and efficient, suitable for encrypting large amounts of data, but require secure key distribution methods to prevent interception.

Symmetric key encryption: A form of cryptography that utilizes a single secret key for both encryption and decryption of data. The key is used to convert plaintext data into ciphertext, and the same key is used to convert the ciphertext back into the original plaintext. While this method provides a fast and efficient means of data encryption, securely distributing the key to the intended parties presents a unique challenge, as anyone who possesses the key can decrypt the information.

Symmetric Multiprocessing (SMP): A computer architecture that enables two or more identical processors to connect and share a single, coherent view of the main memory. SMP systems can process multiple tasks simultaneously, improving performance and reliability.

Synchronous: The events that occur at the same time or in a predictable and consistent time sequence. In the context of data transmission, synchronous refers to the method where data is sent at regular intervals, often accompanied by a clock signal, to ensure both the sender and receiver are in synchronization. This consistent timing can improve the efficiency of data transmission but requires both systems to maintain the same pace, which can be challenging.

SYN Flood: A type of denial of service (DoS) attack that overloads a server by sending numerous SYN (synchronize) packets without completing the connection process. It is commonly used to disrupt network services or take down a website. Examples include a SYN Flood attack on a web server or a SYN Flood attack on a DNS server.