a fundamental domain or fundamental region is a subset of the space which contains exactly one point from each of these orbits . It serves as a geometric realisation for the abstract set of representatives of the orbits . There are many ways to choose a fundamental domain .
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Cryptographic system converts between plaintext and ciphertext. Cryptography is t<span>he process of making and using codes to secure transmission of information.
The c</span>ryptographic system involves encryption (the process of converting original message into a form unreadable by unauthorized individuals) and decryption (t<span>he process of converting the cipher text message back into plaintext so that it can be readily understood.)</span>
It's voice phishing but it's also sometimes referred to as vishing
