Rogier, N.; Chauvaud, Pascal (1997). "MD2 is not Secure without the Checksum Byte". Designs, Codes and Cryptography. 12 (3): 245–251. doi:10.1023/A:1008220711840. S2CID21613457.
RSA Laboratories. "What are MD2, MD4, and MD5?". Public-Key Cryptography Standards (PKCS): PKCS #7: Cryptographic Message Syntax Standard. RSA Laboratories. Archived from the original on 16 January 2017.
Rogier, N.; Chauvaud, Pascal (1997). "MD2 is not Secure without the Checksum Byte". Designs, Codes and Cryptography. 12 (3): 245–251. doi:10.1023/A:1008220711840. S2CID21613457.
RSA Laboratories. "What are MD2, MD4, and MD5?". Public-Key Cryptography Standards (PKCS): PKCS #7: Cryptographic Message Syntax Standard. RSA Laboratories. Archived from the original on 16 January 2017.