WebMD Symptom Checker helps you find the most common medical conditions indicated by the symptoms joint pain, muscle stiffness (rigidity), muscle weakness and night sweats including Lack of exercise, Exercise or physical activity, and Hypocalcemia.endinitis symptoms include muscle and tendon pain or stiffness close to a joint, and pain with movement.
Symmetric Encryption. Symmetric encryption (or pre-shared key encryption) uses a single key to both encrypt and decrypt data. Both the sender and the receiver need the same key to communicate. Symmetric key sizes are typically 128 or 256 bitsâthe larger the key size, the harder the key is to crack.
In symmetric systems the same key (the secret key) is used to encrypt and decrypt a message. Data manipulation in symmetric systems is faster than asymmetric systems as they generally use shorter key lengths. Asymmetric systems use public key to encrypt a message and a private key to decrypt it.Use of asymmetric systems enhances the security of communication. In colloquial use, the term  code  is often used to mean any method of encryption or concealment of meaning.ymmetric-key cryptography, where a single key is used for encryption and decryption. Symmetric-key cryptography refers to encryption methods in which both the sender and receiver share the same key (or, less commonly, in which their keys are different, but related in an easily computable way).