![]() ![]() See Hashing.Īt the time of publication, examples of industry-tested and accepted standards and algorithms include AES (128 bits and higher), TDES/TDEA (triple-length keys), RSA (2048 bits and higher), ECC (224 bits and higher), and DSA/D-H (2048/224 bits and higher). Cryptography is a method to protect data and includes both encryption (which is reversible) and hashing (which is “one way” that is, not reversible). HostĬryptography based on industry-tested and accepted algorithms, along with key lengths that provide a minimum of 112-bits of effective key strength and proper key-management practices. ![]() It is recommended that hashed cardholder data include an input variable (for example, a “salt”) to the hashing function to reduce or defeat the effectiveness of pre-computed rainbow table attacks (see Input Variable).įor further guidance, refer to industry standards, such as current versions of NIST Special Publications 800-107 and 800-106, Federal Information Processing Standard (FIPS) 180-4 Secure Hash Standard (SHS), and FIPS 202 SHA-3 Standard: Permutation-Based Hash and Extendable-Output Functions. In the context of PCI DSS, hashing must be applied to the entire PAN for the hash code to be considered rendered unreadable. (2) It is computationally infeasible to find two inputs that give the same hash code. (1) It is computationally infeasible to determine the original input given only the hash code, A hash function should have the following properties: Hashing is a one-way (mathematical) function in which a non-secret algorithm takes any arbitrary length message as input and produces a fixed length output (usually called a “hash code” or “message digest”). Process of rendering cardholder data unreadable by converting data into a fixed-length message digest. CVV2 – Card Verification Value 2 (Visa payment cards).PAN CVC2 – Card Validation Code 2 (MasterCard payment cards).CAV2 – Card Authentication Value 2 (JCB payment cards). ![]()
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