November 2018
Intermediate to advanced
382 pages
11h 20m
English
Content preview from Practical Internet of Things Security - Second Edition
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Symmetric encryption
Symmetric encryption simply means the sender (encryptor) and the receiver (decryptor) use an identical cryptographic key. The algorithm, which is able to both encrypt and decrypt—depending on the mode—is a reversible operation, as shown in the following diagram:
Symmetric-encryption.graffle
In many protocols, a different symmetric key is used for each direction of travel. So, for example, Device A may encrypt to Device B using key X. Both parties have key X. The opposite direction (B to A) may use key Y, which both parties also have.
Symmetric algorithms consist of a ciphering operation using plaintext or ciphertext input, ...
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