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Software Package Information Security
All
JUNOS software is delivered in signed packages that contain digital
signatures, Secure Hash Algorithm (SHA-1), and Message Digest 5 (MD5)
checksums. A package is installed only if the checksum within it matches
the hash recorded in its corresponding file. Which checksum is used
depends on the software version:
- Digital signatures are used when you upgrade or downgrade
between JUNOS Release 7.0 and a later version.
- The SHA-1 checksum is used when you upgrade or downgrade
between JUNOS Release 6.4 and a later version.
- The MD5 checksum is used when you upgrade or downgrade
between JUNOS Release 6.3 or earlier and a later version.
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