MD2 (Message Digest 2) is a cryptographic hash function designed by Ron Rivest in 1989. It produces a 128-bit hash value. MD2 is the oldest in the MD family, followed by MD4 and MD5.

No. MD2 is cryptographically broken and should not be used for security purposes. Preimage attacks exist, and it's vulnerable to collision attacks. Use SHA-256 or SHA-3 for secure hashing.

MD2 appears in some legacy PKI certificates, older S/MIME signatures, and historical systems. It's mainly encountered when analyzing old cryptographic implementations.

MD2 was designed for 8-bit processors and uses byte-by-byte operations with a substitution table. It's significantly slower than MD4/MD5 which use 32-bit operations.

MD2 (1989) uses 8-bit operations and is slowest. MD4 (1990) uses 32-bit operations for speed. MD5 (1992) added more rounds for security. All produce 128-bit hashes but use different algorithms.

MD2 produces a 128-bit (16-byte) hash, displayed as 32 hexadecimal characters - same length as MD4 and MD5.

MD2 is needed for legacy certificate analysis, forensic investigation of old systems, cryptographic research, and understanding historical hash function design.

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