Juno Series Handhelds User Guide 25
Encrypting files on memory cards
To prevent sensitive data on a memory card from being used if the card is lost or
stolen, files can be encrypted as they are placed on the card.
When encryption is enabled, an encryption key is stored on the handheld. Files are
encr
ypted as they are copied or written to the memory card. Files already saved on
memory cards before enabling encryption are not automatically encrypted.
Note – B
ecause the encryption key is stored on the handheld, encrypted files are only
readable on the handheld on which they are initially encrypted. It is not possible to read
encrypted files on the storage card with any other device, including another Juno series
handheld or an office computer.
C
CAUTION – If you reset the handheld to the factory default settings, the encryption key is
deleted and the handheld is no longer able to read any encrypted files on a memory card.
This means that any files you have encrypted are permanently locked and unreadable by
any device. To avoid being unable to read previously encrypted files, Trimble recommends
that you use another device, such as an office computer, as the primary location for
storing important data and to control the encryption of important files.
To enable encryption of files as they are written to a memory card:
1. Tap / Settings / Sy
stem / Encryption.
2. Select the En
crypt files when placed on a storage card check box.
Note – En
crypted files appear as ordinary files on the handheld they were encrypted on. If
the memory card is inserted in another device, the files appear with a .menc file extension
and cannot be opened.
To disable encryption, clear the En
crypt files when placed on a storage card check box.
Note – D
isabling encryption does not remove encryption from any existing files on the
memory card, but ensures that new files placed onto the memory card are not encrypted.
To encrypt files that are already stored on a memory card:
1. Copy the files to the handheld’s internal memory or to an office computer.
2. Ensure encryption is enabled on the handheld.
3. Copy the files back to the memory card. The files are encrypted as they are
wr
itten to the memory card.
To remove encryption from files so they can be read by other devices:
1. Insert the memory card in the handheld and then connect the handheld to an
o
ffice computer (see Connecting to an office computer, page 43).
2. Copy the encrypted files from the memory card to the office computer.
3. To use the decrypted files on the handheld, copy the files from the office
c
omputer to the handheld’s main memory.
4. To store the decrypted files on a memory card, ensure that encryption is not
enabl
ed on the handheld and then copy the decrypted files from the office
computer to the memory card.
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