Cryptography Reference
In-Depth Information
Table 9.6. IBC in Comparison with PKC and IBC
Key
distribution
Number
of keys
Key
directory
Digital
certifi cates
Forward
encryption
Nonrepudiation
Symmetric key
cryptography
Problematic
Ο
At each
node
No
No
No
(
n
2
)
Random key
predistribution
Simple
Ο
(
n
)
At each
node
No
No
No
Ο
PKC
Complex
(
n
)
At each
node and
key center
Ye s
N o
Ye s
IBC
Simple
N
No
No
Yes
Yes
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