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For example, a web client might fetch an S-HTTP page over an SSL protected link via a firewall that supports IPsec tunnels. That's three 40 bit keys protecting the data over the internet link (of course, this may not be equivalent to a 120 bit cipher, that depends on the details of the cipher systems and independence of the key setups).
C'mon Bob.. how long has it been since you picked a lock? :-) Given the likely presence of known or verifiable plaintext at each nesting level, a three-deep nesting of 40-bit ciphers like this probably increases the strength to about, ohh, a 42 bit cipher. - Bill -----BEGIN PGP SIGNATURE----- Version: 2.6.1 iQCVAwUBMI2kGrT+rHlVUGpxAQEKzwP+N7TlofhbYgHXycj7KCdpLhXFzZpnqlCB ce/3ng9e4zN9G+lX/zpEeH/muhVkKFOwpaadYBKrn7Mu63dT0guCFNlApo9AMagU xcLHex5AsKM3tWCayiTN5TP14bxEx2jSR54jSJIKsfulkpYRK0LYGj/fc5mSH8iP r9qXBCrp7xA= =QtVF -----END PGP SIGNATURE-----