February 2019
Intermediate to advanced
450 pages
9h 59m
English
Content preview from Hands-On Blockchain for Python Developers
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Symmetric and asymmetric cryptography
Symmetric cryptography uses the same key between sender and receiver. This key is used to encrypt and decrypt a message. For example, you want to create an encryption function to encrypt text. Symmetric cryptography could be as simple as adding 5 to the text to be encrypted. If A (or 65 in ASCII) is the text to be encrypted, then this encryption function will add 5 to 65. The encrypted text would be F (or 71 in ASCII). To decrypt it, you just subtract 5 from the encrypted text, F.
Asymmetric cryptography is a different beast. There are two keys: a public key and a private key. They are linked with a special mathematical relationship. If you encrypt a message with a public key, you can only decrypt it ...
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