By Hadfield

ISBN-10: 0175556938

ISBN-13: 9780175556939

*The language syllabus follows the communicative talents of the scholars *Suitable to be used with any path *Teacher's notes aid you play each one video game *Photocopiable ideas sheets advisor the scholars

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Extra info for Advanced Communication Games: A Collection of Games and Activities for Intermediate and Advanced Students of English

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One way to accomplish this was to go in and create a new user account for which attackers created the password. They would then go into etc/passwd and take the encrypted value for the password for the account just created and copy it over the current value for root. (Usually attackers would save the original value of root so that they could put the system back to the way it was to cover their tracks). Essentially, attackers could change the password for the root without knowing what the original value was.

A secure channel is one on which no one can read any information in transit. A trusted channel is one on which you can read information, but you are assured that the information comes from a trusted source and therefore has not been modified in transit. Asymmetric encryption requires a trusted channel because anyone can generate a key pair and spoof someone’s public key. To minimize or reduce the chance of spoofing you have to have some level of confidence that the key came from the expected recipient.

Caesar or ROT ciphers simply rotate a character a certain number of places in the alphabet. Say that you are using an ROT 3 scheme with the English language; in that case, each letter would be rotated three spaces in the alphabet. The word “cat” would become “fdw” by rotating the letters three places forward—letter “c” rotated three places to the letter “f”, and so on. This table shows an ROT 1 scheme where each letter moves one letter to the right: a b c d e f g h i b c d e f g h i j j k k l m n o p q r s t u l m n o p q r v w x s t u v w x y y z z a To encrypt a message with an ROT 1 scheme you find the letter on the top row and replace it with the letter on the bottom row.

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Advanced Communication Games: A Collection of Games and Activities for Intermediate and Advanced Students of English by Hadfield

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