This document provides two methods for password protecting the Photos app on Mac to prevent unauthorized access to private photos. Method 1 involves using Mac's parental controls to limit access to the Photos app. Method 2 uses a third-party app called AppCrypt that allows setting a single password to lock individual apps, including Photos. Both methods aim to keep private photos secure from prying eyes on a shared or unlocked Mac.

1. How to Lock Photos App
with Password on Mac
In this slideshow, we will show you two ways to
password protect Photos app on Mac.

2. It Is Imperative to Keep Your Photos
from Prying Eyes
Approximately 90,000 photos and 9,000 videos were leaked in the form of
a massive 13.6 GB file that was then posted on viralpop.com, a site created
exclusively to host the cache of personal photos. Much like its namesake,
“The Fappening” (which claimed a variety of celebrities as victims) and
“the Snappening” (the Snapchat equivalent of photo hacks), these leaks
have raised serious concerns regarding personal privacy and corporations’
ability to protect private information.
--From Attn

3. On August 31, 2014, a collection of almost 500 private pictures of
various celebrities, mostly women, and with many containing nudity,
were posted on the imageboard 4chan, and later disseminated by other
users on websites and social networks such as Imgur and Reddit. The
images were believed to have been obtained via a breach of Apple's cloud
services suite iCloud. Apple later confirmed that the hackers responsible
for the leak had obtained the images by phishing iCloud usernames and
passwords.
--From Wikipedia

4. After all these photo leakage events happened, many users may not
post their photos on various photos websites or platforms that can
store photos, they choose to store their photos on Mac. But is it really
safe to store photos on Mac? That may not be. Everyone around you
can see your photos when using your Mac. So it is imperative to lock
your Photos app to keep your Mac photos from prying eyes. When you
lock the Photos app, no one can view your photos. You can follow
below two methods to lock your Photos app on Mac.

5. Method 1:
Create a password for Photos app with Mac
Parental Controls
Intro:
1. Apple's user management system for
controlling which system functions and applications are available to a
managed user.
2. Prevent user accounts from accessing inappropriate content on Internet
or apps and manage, monitor, control the time the users spend on the
Mac, the websites they visit, the apps they access and the people they
chat with.

6. Steps:
1. Choose Apple menu > System Preferences, then click Parental Controls. Click the
lock icon to unlock it, then enter your administrator name and password.
2. Select a user, then click Enable Parental Controls. If there is no user in the list, click
Add + button , then fill in the name, account, and password information to create a
new user.
3. After you select a user, click “Apps” of the tabs along the top. Check “Limit
Applications”. And choose the app you want the user to access, so please unselect
Photos app when you don’t want to others to see your privacy photos.
4. At last, don’t forget to click button to prevent further changes. This can help
improve Mac security and privacy.

7. Screenshot:

8. Tip:
1. It can not be enabled for administrator accounts. So
when you lend your Mac to others, you have to change
your user account.
2. If you are working or learning with the administrator
account and leave the Mac for a while, there are some
possibility that someone can open Photos and view your
privacy photos on your Mac.

9. Method 2:
Password protect Photos app on Mac
with AppCrypt
Intro:
1. Safely lock applications like Photos, Contacts, Google, Quicken, iPhoto,
iTunes, Safari, Mail, YouTube, etc.
2. Allows you to set just one password to lock individual, multiple or all apps
on your Mac to safeguard them from access by unauthorized users.
3. Set a schedule for each app (or all apps) to allow unblocked usage for
specific days and times.

10. Steps
1. Install and launch AppCrypt on Mac. Then
AppCrypt will ask you to set a password which
will be used to access the blocked Mac apps and
change AppCrypt settings.
2. Click OK to confirm and click “Add App” on the
top menu bar to add the Photos app. And the
Photos app will be listed on the left column. Once
you add a app to the block list, the app will be
protected with the AppCrypt password.
Free download address:
https://www.cisdem.com/download/cisdem-appcrypt.dmg

11. Screenshot:

12. Screenshot:

13. Tip:
AppCrypt is 100% safe to use and user-
friendly. It will not modify any Mac
system or application files. You can lock
all your apps with one password. By the
way, the free trial version of it always
allows you to lock one app without
expiring date.