Passport scams, fake accommodation listings and websites can turn a dream holiday into a nightmare.
As the scammers get more advanced and technology races ahead, there are ways to avoid such pitfalls.
Ronan Murphy, Executive Chairman at smarttech247, gave his top tips to The Pat Kenny Show.
Identity theft
"Usually it's when people are sharing information across spurious - fake - websites," he said.
"Scammers and hackers are collecting and curating that data.
"Typically when they're trying to get people to book a fake holiday or accommodation, they'll ask them to submit a copy of their passport or credit card.
"Obviously you go down a rabbit hole then in terms of the consequences of doing that".
He said if hackers have more than one source of information - such as passport and a credit card together - they can "build up a complete picture of the individual."
"You can use that to try and break into their bank account, you can use it for other types of fraud".
Fake accomodation
Mr Murphy said it's important for people to stay on reputable, recognised websites.
"When people are looking for a good deal on Airbnb or for flights, they'll try and direct them to fake websites," he said
"So the moment you move out of Booking.com or Airbnb... you're now gone down that rabbit hole of the scammers.
"You're outside of the safety net you envisage you have.
"They'll bring you to a less reputable website where they will try and scam you".
Credit card
Mr Murphy said paying by credit card is always a good idea.
"I think it's important whenever you're booking anything... that you thoroughly research where you're booking.
"You look at the reviews, you check the website address: just be ultra-vigilant and have a level of skepticism when you're booking anything.
"Use your credit card: if you use your credit card you've got insurance when you're using your credit card".
And the golden rule: "Be cautious of too good to be true offers.
"If a deal seems too good to be true, it's probably a scammer," he added.
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