SHARK may refer to:

• SHARK, a block cipher identified as one of the predecessors of Rijndael
• SHARK was also a World War II codename for a German naval cipher using the Enigma machine
• SHARK (Shorthand-Aided Rapid Keyboarding or ShapeWriter), a data input method
• S.Ha.R.K. or SHaRK, a component-based real-time kernel architecture

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