<s>
Strong	B-General_Concept
secrecy	I-General_Concept
is	O
a	O
term	O
used	O
in	O
formal	O
proof-based	O
cryptography	O
for	O
making	O
propositions	O
about	O
the	O
security	O
of	O
cryptographic	B-Protocol
protocols	I-Protocol
.	O
</s>
<s>
Strong	B-General_Concept
secrecy	I-General_Concept
is	O
related	O
with	O
the	O
concept	O
of	O
semantic	O
security	O
or	O
indistinguishability	O
used	O
in	O
the	O
computational	O
proof-based	O
approach	O
.	O
</s>
<s>
Bruno	O
Blanchet	O
provides	O
the	O
following	O
definition	O
for	O
strong	B-General_Concept
secrecy	I-General_Concept
:	O
</s>
<s>
Thus	O
m	O
is	O
not	O
a	O
strong	B-General_Concept
secret	I-General_Concept
.	O
</s>
<s>
If	O
however	O
,	O
probabilistic	O
encryption	O
were	O
used	O
,	O
m	O
would	O
be	O
a	O
strong	B-General_Concept
secret	I-General_Concept
.	O
</s>
