Encryption is a method for transforming data in order to maintain confidentiality used to prevent unauthorized access, wiretapping or interception of the data. The encryption process provides key agreement between users and its usage in the encryption process. Technical encryption feature is that an attacker will not be able to access data without having a unique key which is used by users.
Encryption can be symmetric or asymmetric. The symmetric encryption uses only one key, two users know in advance. The asymmetric encryption uses two keys – public and private. Public key is used to encrypt the message, and decryption key is secret.
Data Encryption in Video Conferencing
With the advent of Internet-based services for communication, data leakage protection gained a significant relevance. Therefore, the software that supports encryption is the most secure option for clients who do not want to face possible problems with unauthorized interception of data traffic, such as:
→ Stealing logins and passwords;
→ Unauthorized recording;
→ Listening or viewing the conference.
SSL (Secure Sockets Layer) is a cryptographic protocol that provides communication security and prevents falsification. SSL involves the exchange of keys between two points: the client and the server, during which they seem to “agree” on how the algorithm and key to encrypt data.
How it works in video conferencing?
The use of SSL for the video conference creates a secure channel with a unique symmetric encryption. In order for the user to safely “contact” with the server, a special session authentication key is sent from the server to the client. In turn, the client receives this key, thus confirming the reliability of the source. Such procedure for obtaining and key agreement is called a “handshake” or “SSL matching procedure” between the server and the user and it continues throughout the video conference, thus providing a safe and secure connection.
The main objective of the exchange of encryption keys and decryption is creating a secret client environment, known only to the server and the client. So that traffic interceptor will not be able to connect to the conference, as it doesn’t know a secret key.
Standard AES symmetric encryption is the most common and secure. There are three types of standards: AES-128, AES-192 and AES-256. The difference between them is in the key, which is determined by the number of bits. The more bits — the better security level is provided by the key.
Therefore, AES-256 is the the most reliable key among all three types.