The key used to encrypt data written by the client. Client write MAC secret. The secret data used to authenticate data written by the client. For SSL, such connections are peer to peer relationships. The connections are transient.
Every connection is associated with one session.
CRL Certificate Revocation List. A certificate that is not valid but still within its expiry date. DES is a very widely used symmetric encryption algorithm. DES is a block cipher. Distinguished Encoding rules used in X509.