av Victor Navarro för 3 årar sedan
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The first division between continents was made by ancient Greek navigators, who named them 'landmass, terra firma'.
Generally classified by convention rather than any strict criteria, nowadays seven regions are regarded as continents from a geopolitical point of view.
Antarctica is not only the coldest place on Earth but also the highest, driest, windiest and emptiest, completely covered with ice.
75% of the world's ice and 70% of the Earth's fresh water is located here.
Summer months of December to February give 24 hours of light, while the winter months of late March to late September are pitch dark the whole day.
There are no permanent inhabitants, except for scientists maintaining research stations in Antarctica.
The coldest natural temperature ever recorded on Earth was recorded here.
Write it down.
Write down the temperatures of the Frozen Continent during the summer and the winter.
You can find on this continent:
The world's largest snake and the second-longest lives here.
Name this snake as well as other animals that can be found in South America.
The largest forest, which covers 30% of South America's total area, is famous for its biodiversity. It’s crisscrossed by thousands of rivers, including the powerful Amazon.
Name this forest as well as its type.
The world's highest uninterrupted waterfall can be found here.
Write down its name, height and the country in which you can find it.
There are 12 countries that make up South America.
Name as many of you can! Don't forget about their capitals.
North America has five time zones and it is the only continent with every type of climate.
North America was named after the explorer Amerigo Vespucci and is also known as the 'New World'.
The world's largest sugar exporter among the seven continents - Cuba - also called the 'sugar bowl of the world' is located here.
The world's largest freshwater lake by surface area and the third-largest freshwater lake by volume can be found here. It provides a route for the transportation of iron ore, as well as grain and other mined and manufactured materials.
Large cargo vessels called lake freighters, as well as smaller ocean-going freighters, transport these commodities across this lake.
Name this lake.
There are 23 countries that make up North America.
Name as many of you can! Don't forget about their capitals.
Trabaja con bloques de 64 bits y la clave de 128 bits (todos útiles, sin paridad). Igual que DES, IDEA.
Opera con bloques de tamaño variable 832, 64 o 128 bits) y clave también variable.
Es el algoritmo empleado por el WPA de las redes inalámbricas. Opera con claves de 128, 192 o 256 bits. Opera con bloques.
Se basa en aplicar DES 3 veces. La clave es de 128 bits y se divide en dos de 64 (claves A y B), es mas seguro que DES
Divide la información en bloques de 64 bits y los cifra con claves de 64 bits, es altamente vulnerable
Australia is the world's smallest continent and is also known as an 'island continent' as it is surrounded by water on all sides.
It includes 14 countries and it is the least populated continent.
Its name comes from the Latin word 'australis' meaning 'southern' because it lies entirely on the south of the equator.
The largest coral reef can be found here.
Name this coral reef, add its length and mention what type of coral is it.
Emisor y receptor usan un par de claves, clave pública y clave privada, la clave pública es compartida, pero no así la privada. El emisor cifrará con la clave pública siendo sólo posible el descifrado con la clave privada del receptor.
En la que emisor y receptor comparten una misma clave para el cifrado y descifrado del mensaje.
Out of 14, how many countries you can name?
How about these countries' capitals?
Se sustituyen los caracteres del mensaje original por otros (que pueden ser letras, números o incluso imágenes o sonidos).
Los caracteres (grupos de caracteres) del mensaje original se cambian de posición. Podrán ser simples, dobles o múltiples según el número de veces que se realice la transposición.
