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if a longer password is more secure, why not just use the entire sentence instead of...

if a longer password is more secure, why not just use the entire sentence instead of picking the first letter of each word

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Yes, the longer password are more secure, but the use of entire sentence will consist of dictionary words like example :

Prince Had a Purple Book, It will be easy for attacks by the hacker to predict the words in a sentence . The possible combination of word can be predicted by using brute force approach or by dictionary attack therefore the use of sentences is not recommended.

Instead using the first letter each word in a sentence along with the numbers and special characters are considered to be a tough password.

A long password should be of at least 8 to 15 random characters with both upper and lower cases and special characters, and numbers like Phapb@12.

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