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HackerRank: Message Decryptor

reverse string and put duplicate words as number of occurrences. disclaimer: use this for learning purpose, do not just copy paste

SQL Mastery

Solving HackerRank problem: SQL Basic to Advance

4G Network: 3.4. Integrity Control

I just received a message. How can I be sure that this message is coming from my network and not from someone else trying to send me false information or that this message hasn’t been modified by someone in the network?