Tiger is a 192-bit cryptographic hash function designed by Ross Anderson and Eli Biham in 1995. It was optimized for 64-bit processors, making it fast on modern systems while maintaining strong security properties.

Tiger is used in Direct Connect (DC++) file sharing, eDonkey2000 network, TTH (Tiger Tree Hash) for file verification, and some digital signature schemes. It's popular in P2P applications.

TTH is a hash tree where Tiger is applied to 1024-byte blocks, then combined hierarchically. This allows verifying file chunks independently. It's the standard hash for DC++ and ADC protocols.

Tiger-192 remains unbroken for practical purposes. Theoretical weaknesses exist for reduced-round versions, but full Tiger maintains good security margins. For new projects, SHA-256 is often preferred.

Tiger produces a 192-bit (24-byte) hash, displayed as 48 hexadecimal characters or as a Base32 string (39 characters) in some P2P applications.

Tiger2 uses a different padding scheme (appends 0x80 like MD5/SHA instead of 0x01). Both produce 192-bit hashes. Tiger2 is less commonly used.

Tiger uses 64-bit operations extensively, making it very fast on 64-bit processors. When designed in 1995, this was forward-looking as 64-bit systems were emerging.

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