Not all personal information carries equal value to identity thieves, some data points are genuinely dangerous if exposed, opening the door to serious, hard-to-reverse fraud, while others carry more limited risk on their own. Understanding exactly what thieves want, and why, helps you prioritize protecting the information that actually matters most.

Social Security Numbers: The Most Valuable Target

Your Social Security number is arguably the single most valuable piece of information to an identity thief, since it’s used as a primary identifier across credit applications, tax filings, employment, and government benefits, making it a master key that unlocks a wide range of fraud possibilities.

Information Type	Why It’s Valuable to Thieves
Social Security number	Master identifier for credit, taxes, employment fraud
Full name + date of birth	Combined with other data, enables identity verification bypass
Bank account/routing numbers	Direct access to move or steal funds
Login credentials	Direct account access, especially if reused elsewhere
Driver’s license number	Identity verification, can enable further fraud

Bank Account and Routing Numbers

While your bank account and routing numbers alone don’t grant unlimited access, they can enable specific types of fraud, unauthorized ACH transfers or fraudulent check creation, making this information worth protecting carefully, particularly when sharing it for legitimate purposes like direct deposit.

Login Credentials, Especially Reused Ones

Your username and password for any account carry real value, particularly if you’ve reused that same password elsewhere, since a breach at one relatively low-stakes service can cascade into access at your banking, email, or other sensitive accounts through credential stuffing attacks.

Full Name Combined With Date of Birth

While your name and birthdate individually might seem relatively public, combined together they form a key piece of the identity verification puzzle many institutions use, making this combination more valuable to a thief than either piece alone, particularly when combined further with a Social Security number.

Driver’s License and Government ID Numbers

Government-issued ID numbers can be used to create fraudulent physical identification or to pass identity verification checks at various institutions, making them valuable both for direct fraud and as a stepping stone to further identity theft.

Medical Insurance Information

Medical identity theft, using someone’s insurance information to receive medical care or prescriptions fraudulently, has grown as thieves recognize the value of this information, which can be harder for victims to detect and unwind compared to financial account fraud.

Email Access: A Gateway to Everything Else

Gaining access to your email account is particularly valuable to thieves, since email is typically the recovery method for resetting passwords on nearly all your other accounts, making a compromised email account a potential gateway to a much broader takeover of your digital identity.

Why Seemingly Minor Information Still Matters

Individual pieces of information that seem relatively harmless on their own, your mother’s maiden name, your first pet’s name, common security question answers, can become valuable when combined with other data thieves have gathered, since these details are often used as identity verification questions.

How Thieves Piece Together Fragmented Information

Sophisticated identity theft often doesn’t rely on a single major breach, thieves piece together fragments of information from multiple smaller sources, social media posts, smaller data breaches, phishing attempts, gradually building a comprehensive enough profile to commit meaningful fraud.

What Information You Should Guard Most Carefully

1. Social Security number — share only when genuinely necessary and with verified, legitimate entities
2. Login credentials — never reuse passwords, especially for financial and email accounts
3. Government ID numbers — protect physical documents and avoid unnecessary digital sharing
4. Security question answers — consider using deliberately false, memorable answers rather than easily researchable true information
5. Full birthdate combined with other identifiers — be cautious about sharing this combination publicly, including on social media

Being Cautious About Oversharing on Social Media

Social media posts revealing your birthdate, hometown, pet names, or other seemingly casual details can inadvertently provide thieves with exactly the information needed to answer common security questions or piece together a more complete identity profile.

Frequently Asked Questions

Is it safe to give my Social Security number to any company that asks for it?

No, only provide your Social Security number to entities that genuinely require it for legitimate purposes, employers, financial institutions, government agencies, and be appropriately skeptical of requests from less clearly legitimate sources.

Why does email access matter so much for identity theft?

Email typically serves as the password recovery method for most other accounts, meaning compromised email access can potentially cascade into an attacker gaining access to your banking, shopping, and other sensitive accounts through the password reset process.

Should I use my real answers to security questions?

Consider using deliberately false but memorable answers to common security questions (mother’s maiden name, first pet), since true answers to these questions are often discoverable through social media or other research, undermining their intended security purpose.

Is my information less valuable if I don’t have much money or credit?

Not necessarily, thieves can use your identity for various types of fraud regardless of your current financial status, opening new credit in your name, filing fraudulent tax returns, or committing employment fraud, none of which require you to have significant existing assets.

Final Thoughts

Understanding exactly what information identity thieves value most, Social Security numbers, login credentials, government ID numbers, and the combinations of seemingly minor details that unlock security questions, helps you prioritize protecting what actually matters most rather than treating all personal information with equal, generic caution. Guarding these specific, high-value pieces of information carefully is one of the most effective ways to reduce your overall identity theft risk.