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Hello

Jacky !

Goodbye

Jacky !

Sender

Alice

Message

Altered

Message

Interceptor

Ivan

Receiver

Bob

Bob,

I hate you

Alice

Snoozing

Alice

Fake

Message

Fake

Message

Receiver

Bob

Bob,

I hate you

Alice

• To pose as somebody else

• Interception and modification

EXAMPLE 1 :

EXAMPLE 2 :

E-mail Security in Internet

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