You should select the text by clicking and holding the mouse at the beginning of the text and then dragging it to the end of the area you want to change. You can also use the arrow keys and hold shift, but this takes longer typically.
Some protocols have multiple algorithms to choose from for e.g., cryptographic purposes. During connection set up, client and server negotiate which one they'll use.
One example is the set up of a TLS connection. During the handshake, the client shares a list of its supported ciphers (the 'ciphersuites'). The server responds by indicating the best one that both sides support.
Umm
This is to bunch of questions..
3. ¿Qué mensaje recupera Bob después del descifrado? Mostrar como caracteres hexadecimales.
Respuesta: la clave con el mensaje :